CN114388813B - Current collector - Google Patents
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- CN114388813B CN114388813B CN202210046426.5A CN202210046426A CN114388813B CN 114388813 B CN114388813 B CN 114388813B CN 202210046426 A CN202210046426 A CN 202210046426A CN 114388813 B CN114388813 B CN 114388813B
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- 238000009792 diffusion process Methods 0.000 claims abstract description 146
- 239000011148 porous material Substances 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 135
- 239000000463 material Substances 0.000 claims description 29
- 229910052759 nickel Inorganic materials 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000011241 protective layer Substances 0.000 claims description 2
- 210000000051 wattle Anatomy 0.000 claims 2
- 239000000446 fuel Substances 0.000 abstract description 22
- 230000004907 flux Effects 0.000 abstract description 15
- 238000009826 distribution Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 37
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 27
- 239000011248 coating agent Substances 0.000 description 8
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- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
- H01M4/8803—Supports for the deposition of the catalytic active composition
- H01M4/8807—Gas diffusion layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel Cell (AREA)
- Inert Electrodes (AREA)
Abstract
The invention discloses a current collector, which relates to the technical field of electrochemical devices, and comprises a first diffusion layer, a second diffusion layer, a third diffusion layer and a surface protection layer which are sequentially stacked from bottom to top, wherein the first diffusion layer and the third diffusion layer are made of porous materials, and the second diffusion layer comprises a plurality of conductive strips which are arranged at intervals so as to form a gas channel between the conductive strips. The current collector is provided with an open gas diffusion channel, which is beneficial to increasing the gas diffusion flux, reducing the diffusion resistance of the gas such as fuel or air in the electric pile and improving the uniformity of the distribution of the gas such as fuel or air on the surface of the electrode. The current collector provided by the invention forms an open gas diffusion channel through the first diffusion layer, the second diffusion layer and the third diffusion layer, and has high gas diffusion flux.
Description
Technical Field
The invention relates to the technical field of electrochemical devices, in particular to a current collector material.
Background
The Solid Oxide Cell (SOC) is an electrochemical device using oxygen ions or proton conductive oxides as an electrolyte membrane, and can be operated in a fuel cell mode to efficiently and cleanly convert fuels such as hydrogen, synthesis gas and the like into electric energy and heat energy, and in an electrolysis mode to convert water/carbon dioxide into hydrogen/carbon monoxide, thereby converting surplus electric power into chemical energy. The SOC unit cell is composed of a dense electrolyte, and porous air poles (or called positive poles) and porous fuel poles (or called negative poles) located on both sides of the dense electrolyte, and in order to meet the high power requirement in practical application, the unit cell, the fuel pole current collector, the air pole current collector, the connector and the like need to be connected in series and packaged into a galvanic pile through the fuel pole sealing element and the air pole sealing element.
In order to enhance the uniformity of the distribution of the gases such as fuel, air and the like on the surface of the electrode, a current collector is arranged, and the current collector is required to be manufactured on two sides of a connecting body respectively by adopting a machining process, an etching process and the likeCreating a diffusion path for fuel gas and air. In order to enhance the stability of the galvanic pile performance, it is also necessary to cover the surface of the connector with a protective conductive coating, such as a metallic nickel coating on the fuel side surface of the connector and (La, sr) MnO on the air side surface of the connector 3 Or MnCo 2 O 4 And an electrically conductive oxide coating. However, the gas diffusion flux of the current collector is low.
Disclosure of Invention
The invention mainly aims to provide a current collector, and aims to provide a current collector with high gas diffusion flux.
In order to achieve the above objective, the present invention provides a current collector, which comprises a first diffusion layer, a second diffusion layer, a third diffusion layer and a surface protection layer, wherein the first diffusion layer, the second diffusion layer, the third diffusion layer and the surface protection layer are sequentially stacked from bottom to top, the first diffusion layer and the third diffusion layer are made of porous materials, and the second diffusion layer comprises a plurality of conductive strips arranged at intervals so as to form a gas channel between the conductive strips.
Optionally, the material of the first diffusion layer includes Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which delta is more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the conductive strips comprise Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which delta is more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the material of the third diffusion layer comprises Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which delta is more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the material of the surface protection layer comprises Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which is more than or equal to 0 and less than or equal to 1.
Optionally, the material of the first diffusion layer includes (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the conductive thorn comprises (La) 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the material of the third diffusion layer comprises (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the material of the surface protection layer comprises (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1.
Optionally, the first diffusion layer has a porosity of 30% -98%; and/or the number of the groups of groups,
the porosity of the third diffusion layer is 30% -98%; and/or the number of the groups of groups,
the thickness of the first diffusion layer is 0.05-1 mm; and/or the number of the groups of groups,
the thickness of the third diffusion layer is 0.05-1 mm; and/or the number of the groups of groups,
the thickness of the second diffusion layer is 0.05-1 mm.
Optionally, the conductive thorn is a cylinder, and the diameter of the cylinder is 0.5-10 mm.
Optionally, the conductive strips are made of porous materials, and the porosity of the porous materials is 0% -90%.
Optionally, the thickness of the surface protection layer is 1-1000 μm; and/or the number of the groups of groups,
the surface protection layer is made of porous materials, and the porosity of the porous materials is 0% -40%.
Optionally, the second diffusion layer and the third diffusion layer are both provided in plurality, and the number of the second diffusion layer and the third diffusion layer is equal.
Optionally, the thickness of the current collector is 0.1-5 mm; and/or the number of the groups of groups,
straight holes extending vertically are formed in the first diffusion layer, the conductive strips and the third diffusion layer in a penetrating mode, and the aperture of each straight hole is 5-200 microns.
According to the technical scheme, the current collector comprises a first diffusion layer, a second diffusion layer, a third diffusion layer and a surface protection layer which are sequentially stacked from bottom to top, wherein the first diffusion layer and the third diffusion layer are made of porous materials, and the second diffusion layer comprises a plurality of conductive strips which are arranged at intervals so as to form a gas channel between the conductive strips, so that the current collector is provided with an open gas diffusion channel, the increase of gas diffusion flux is facilitated, the diffusion resistance of gases such as fuel or air in a galvanic pile is reduced, and the uniformity of the distribution of the gases such as fuel or air on the surface of an electrode is improved. The current collector provided by the invention forms an open gas diffusion channel through the first diffusion layer, the second diffusion layer and the third diffusion layer, and has high gas diffusion flux.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other related drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is an exploded view of one embodiment of a current collector provided by the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a current collector according to the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the |
| 100 | |
3 | |
| 200 | Repeat |
4 | Surface protection layer |
| 1 | A |
5 | Conductive |
| 2 | Second diffusion layer |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to enhance the uniformity of distribution of the gas such as fuel and air on the electrode surface, a current collector is provided, and it is necessary to manufacture diffusion channels for the fuel gas and air on both sides of the connection body by using a machining process, an etching process, or the like. To enhance the stability of the galvanic pile performance, it is also necessary to cover the surface of the connection body with a protective conductive coating, e.g. on the connection bodyThe fuel side surface of the connector is covered with a metal nickel coating, and the air side surface of the connector is covered with (La, sr) MnO 3 Or MnCo 2 O 4 And an electrically conductive oxide coating. However, the gas diffusion flux of the current collector is low.
In view of this, the present invention proposes a current collector, which aims to provide a current collector with high gas diffusion flux. In the drawings, fig. 1 is an exploded schematic view of an embodiment of a current collector provided by the present invention; fig. 2 is a schematic structural diagram of an embodiment of a current collector according to the present invention.
Referring to fig. 1 and 2, the present invention proposes a current collector 100, which includes a first diffusion layer 1, a second diffusion layer 2, a third diffusion layer 3 and a surface protection layer 4 stacked in sequence from bottom to top, wherein the materials of the first diffusion layer 1 and the third diffusion layer 3 are porous materials, and the second diffusion layer 2 includes a plurality of conductive strips 5 arranged at intervals to form a gas channel between the conductive strips 5.
In the technical scheme provided by the invention, the current collector 100 comprises a first diffusion layer 1, a second diffusion layer 2, a third diffusion layer 3 and a surface protection layer 4 which are sequentially stacked from bottom to top, wherein the first diffusion layer 1 and the third diffusion layer 3 are made of porous materials, and the second diffusion layer 2 comprises a plurality of conductive strips 5 which are arranged at intervals so as to form a gas channel between the conductive strips 5. The current collector 100 has an open gas diffusion channel, which is helpful to increase the gas diffusion flux, reduce the diffusion resistance of the gas such as fuel or air in the stack, and improve the uniformity of the distribution of the gas such as fuel or air on the electrode surface. The current collector 100 according to the present invention has a high gas diffusion flux by forming an open gas diffusion channel through the first diffusion layer 1, the second diffusion layer 2, and the third diffusion layer 3.
It will be appreciated that the present invention is not limited to the connection manner of the first diffusion layer 1, the second diffusion layer 2, the third diffusion layer 3 and the surface protection layer 4, and is preferably formed by sintering each other.
In one embodiment of the present invention, preferably, the first diffusion layer 1, the conductive collarThe strips 5, the third diffusion layer 3 and the surface protection layer 4 have high electron conductivity under the reducing atmosphere>1S/cm), specifically, the material of the first diffusion layer 1 includes Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which delta is more than or equal to 0 and less than or equal to 1; the conductive thorn 5 is made of Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which delta is more than or equal to 0 and less than or equal to 1; the material of the third diffusion layer 3 includes Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which delta is more than or equal to 0 and less than or equal to 1; the material of the surface protection layer 4 comprises Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which is more than or equal to 0 and less than or equal to 1. In this way, the current collector 100 is made to have high electron conductivity, reducing the electron conduction resistance between the porous electrode (fuel electrode or air electrode) and the connection body.
It will be appreciated that the materials of the first diffusion layer 1, the conductive ribs 5, the third diffusion layer 3 and the surface protection layer 4 may be selected to satisfy both the materials or may satisfy only one of them, and as a preferred embodiment of the present invention, the materials satisfy both the materials, so that the conductivity of the current collector 100 is higher.
In another embodiment of the present invention, preferably, the first diffusion layer 1, the conductive chaste strip 5, the third diffusion layer 3 and the surface protection layer 4 have high electron conductivity under an oxidizing atmosphere>1S/cm), specifically, the material of the first diffusion layer 1 includes (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; the conductive thorn 5 is made of (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; the material of the third diffusion layer 3Comprises (La) 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; the material of the surface protection layer 4 includes (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1. In this way, the current collector 100 is made to have high electron conductivity, reducing the electron conduction resistance between the porous electrode (fuel electrode or air electrode) and the connection body.
Similarly, the materials of the first diffusion layer 1, the conductive strips 5, the third diffusion layer 3 and the surface protection layer 4 may be selected to satisfy both the materials, or may satisfy only one of them, and as a preferred embodiment of the present invention, the materials satisfy both the materials, so that the conductivity of the current collector 100 is higher.
In the solid oxide cell stack, the surface protection layer 4 is in close contact with the airtight connection body, and the atoms in the connection body volatilize and deposit into the porous electrode to suppress the electrode passivation and stack performance degradation caused thereby, so that the surface protection layer 4 is preferably a porous material having a low porosity of 0 to 40% (preferably ranging from 0 to 10%) and even being completely dense.
In order to promote rapid diffusion of the gas such as fuel or air within the current collector 100 to enhance uniformity of distribution of the gas over the porous electrode surface, the first diffusion layer 1 and the third diffusion layer 3 have a porosity of 30% to 98% (preferably ranging from 50% to 70%). The areas of the second diffusion layer 2 except the conductive strips 5 form open channels which are mutually communicated, and gas can be quickly transmitted in the open channels, in addition, the conductive strips 5 can be compact or made of porous materials, and have a porosity of 0-90% (preferably 30% -60%) and the first diffusion layer 1 is tightly contacted with porous electrodes (fuel electrodes or air electrodes) of the single batteries, so that the gas can be quickly transmitted by diffusing through the holes of the conductive strips 5.
Further, the conductive strips 5 are cylinders, and the diameter of the cylinders is 0.5-10 mm, more preferably 1-2 mm, in the embodiment of the present invention, referring to fig. 1 and 2, the cylinders extend in the up-down direction, and the two bottom surfaces are distributed up-down, so that the gas is rapidly transported in the open channel.
Further, the first diffusion layer 1, the conductive strips 5 and the third diffusion layer 3 are each provided with a straight hole extending in the vertical direction, and the diameter of the straight hole is 5-200 μm (preferably 50-150 μm). Furthermore, it is preferable that the straight holes of the first diffusion layer 1, the conductive ribs 5 and the third diffusion layer 3 correspond to each other to form a gas flow channel, so that the current collector 100 has a low porosity and even a dense protective conductive coating, preventing volatilization and deposition of atoms in the connection body into the porous electrode, thereby avoiding passivation of the electrode and deterioration of galvanic performance caused thereby.
The thickness of each layer is not limited in the present invention, and preferably, the thickness of the first diffusion layer 1 is 0.05 to 1mm (more preferably, 0.2 to 0.5 mm); the thickness of the second diffusion layer 2 is 0.05 to 1mm (more preferably 0.2 to 0.5 mm); the thickness of the third diffusion layer 3 is 0.05 to 1mm (more preferably 0.2 to 0.5 mm); the thickness of the surface protective layer 4 is 1 to 1000 μm (more preferably 10 to 100 μm); at the above thickness, the gas diffusion flux of the current collector 100 is high.
It is understood that the thicknesses of the first diffusion layer 1, the second diffusion layer 2, the third diffusion layer 3, and the surface protection layer 4 refer to the dimensions of each layer in the up-down direction, and the four thickness ranges may be satisfied at the same time or may be satisfied only one of them, and as a preferred embodiment of the present invention, the four thickness ranges are satisfied at the same time, so that the gas diffusion flux of the current collector 100 is higher.
Further, in the embodiment of the present invention, the thickness of the current collector 100 is 0.1 to 5mm, and the gas diffusion flux of the current collector 100 is high at the above thickness.
Preferably, the second diffusion layer 2 and the third diffusion layer 3 are each provided in plurality, and the second diffusion layer 2 and the third diffusion layer 3 are provided in equal numbers, so that one second diffusion layer 2 and one third diffusion layer 3 constitute one repeating unit 200, and the current collector 100 is provided with one or more repeating units 200 between the first diffusion layer 1 and the surface protection layer 4, so that the gas diffusion flux of the current collector 100 is high.
In summary, the current collector 100 according to the embodiment of the present invention has a high electron conductivity, and reduces the electron conduction resistance between the porous electrode (fuel electrode or air electrode) and the connection body; secondly, the current collector 100 has an open gas diffusion channel, which is helpful to increase the gas diffusion flux, reduce the diffusion resistance of the gas such as fuel or air in the galvanic pile, and improve the uniformity of the gas such as fuel or air distributed on the electrode surface; finally, the current collector 100 also has a protective conductive coating of relatively low porosity, even dense, to prevent evaporation and deposition of atoms in the connector into the porous electrode, thereby avoiding passivation of the electrode and degradation of the stack performance caused thereby.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, but various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a current collector, its characterized in that includes from down upwards stacks first diffusion layer, second diffusion layer, third diffusion layer and the surface protection layer that sets up in proper order, wherein, first diffusion layer with the material of third diffusion layer is porous material, the second diffusion layer includes a plurality of conductive wattle that the interval set up, in order to form the gas channel between the conductive wattle.
2. The current collector of claim 1, wherein the material of the first diffusion layer comprises Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which delta is more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the conductive strips comprise Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which delta is more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the material of the third diffusion layer comprises Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which is more than or equal to 0 and less than or equal to delta1, a step of; and/or the number of the groups of groups,
the material of the surface protection layer comprises Ni, fe, co, cu, feNi 3 Stainless steel, sr 430 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of which is more than or equal to 0 and less than or equal to 1.
3. The current collector according to claim 1, wherein the material of the first diffusion layer comprises (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the conductive thorn comprises (La) 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the material of the third diffusion layer comprises (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1; and/or the number of the groups of groups,
the material of the surface protection layer comprises (La 1-x Sr x )MnO 3-δ 、(La 1-x Sr x )CoO 3-δ 、LaBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBa 0.5 Sr 0.5 Co 2 O 5+δ 、SmBaCo 2 O 5+δ 、BaGd 0.8 La 0.2 Co 2 O 6-δ 、Sr 2 Fe 1.5 Mo 0.5 O 6-δ 、La 0.5 Sr 1.5 Fe 1.5 M 0.5 O 6-δ 、LaSrFe 1.5 M 0.5 O 6-δ And La (La) 0.4 Sr 1.6 Fe 1.5 Ni 0.1 M 0.4 O 6-δ At least one of the components is more than or equal to 0 and less than or equal to 1, and more than or equal to 0 and less than or equal to 1.
4. The current collector of claim 1, wherein the first diffusion layer has a porosity of 30% to 98%; and/or the number of the groups of groups,
the porosity of the third diffusion layer is 30% -98%; and/or the number of the groups of groups,
the thickness of the first diffusion layer is 0.05-1 mm; and/or the number of the groups of groups,
the thickness of the third diffusion layer is 0.05-1 mm; and/or the number of the groups of groups,
the thickness of the second diffusion layer is 0.05-1 mm.
5. The current collector of claim 1, wherein the conductive ribs are cylinders having a diameter of 0.5 to 10mm.
6. The current collector of claim 1, wherein the conductive strips are porous and have a porosity of 0% to 90%.
7. The current collector of claim 1, wherein the surface protective layer has a thickness of 1 to 1000 μm; and/or the number of the groups of groups,
the surface protection layer is made of porous materials, and the porosity of the porous materials is 0% -40%.
8. The current collector of claim 1, wherein the second diffusion layer and the third diffusion layer are each provided in plurality, and the second diffusion layer and the third diffusion layer are provided in equal numbers.
9. A current collector according to claim 1, wherein the thickness of the current collector is 0.1 to 5mm; and/or the number of the groups of groups,
straight holes extending vertically are formed in the first diffusion layer, the conductive strips and the third diffusion layer in a penetrating mode, and the aperture of each straight hole is 5-200 microns.
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