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CN117154222A - Secondary battery and electric device - Google Patents

Secondary battery and electric device Download PDF

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Publication number
CN117154222A
CN117154222A CN202311169634.5A CN202311169634A CN117154222A CN 117154222 A CN117154222 A CN 117154222A CN 202311169634 A CN202311169634 A CN 202311169634A CN 117154222 A CN117154222 A CN 117154222A
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China
Prior art keywords
carbonate
secondary battery
ltoreq
battery according
equal
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Pending
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CN202311169634.5A
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Chinese (zh)
Inventor
李永芳
高云雷
于子龙
杨山
陈杰
项海标
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Zhejiang Liwei Energy Technology Co ltd
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Zhejiang Liwei Energy Technology Co ltd
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Priority to CN202311169634.5A priority Critical patent/CN117154222A/en
Publication of CN117154222A publication Critical patent/CN117154222A/en
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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a secondary battery and electric equipment, which comprises a negative electrode plate and electrolyte matched with the negative electrode plate; the negative electrode plate is subjected to pre-lithiation treatment, and the pre-lithiation degree is a; the electrolyte comprises a fluorine-containing carbonic ester with the mass percentage of A percent, a sulfide with the mass percentage of B percent and a nitrile additive with the mass percentage of C percent; wherein, the relation between a and A, B and C satisfies the following conditions: a/a is more than or equal to 2 and less than or equal to 5,0.7, B/a is more than or equal to 1.5,0.7, C/a is more than or equal to 1.5. The ratio of the optimal additive to the pre-lithiation degree is controlled by regulating and controlling the addition amounts of different additives, so that the secondary battery with the advantages of reducing the long-cycle expansion rate of the battery core, improving the cycle capacity retention rate and prolonging the cycle life is designed.

Description

Secondary battery and electric device
Technical Field
The invention relates to the technical field of energy storage, in particular to a secondary battery and electric equipment.
Background
Secondary batteries are the main energy source in the communication industry, the electric automobile industry, aerospace and military fields at present. However, the secondary battery is further developed due to the fact that the first irreversible capacity loss is too high and the first coulombic efficiency is too low, so that the development requirements of the current social production and living are difficult to be met, and people are urgent to seek an effective method to solve the current dilemma. The rise of the pre-lithiation technology provides an effective way for improving the energy density, the irreversible capacity loss and the first coulombic efficiency of the lithium ion battery, and the lithium ion battery is developed and injected into the living place. In the great trend of high energy density development, the demand for additives such as lithium salt additives, fluoroorganic solvent additives, sulfonate additives, phosphate or phosphite additives, and also borate additives, nitrile additives, sulfone additives and ionic liquid additives must be greatly increased.
Different additives in the electrolyte can exert different effects on the electrochemical performance of lithium ions, but the content and the types of the additives often cannot simultaneously give consideration to various effects, and the effects are the best as the content is too much or too little; the increase or decrease of the species is not known whether the effect is superposition or halving.
Therefore, it is necessary to provide a new secondary battery which has a reduced cell long-cycle expansion rate, an improved cycle capacity retention rate and a long cycle life.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the first aspect of the invention provides a secondary battery, which reduces the long-cycle expansion rate of the battery core, improves the cycle capacity retention rate and prolongs the cycle life.
The second aspect of the invention also provides electric equipment.
According to a first aspect of the present invention, there is provided a secondary battery including a negative electrode tab and an electrolyte mated with the negative electrode tab; the negative electrode plate is subjected to pre-lithiation treatment, and the pre-lithiation degree is a; the electrolyte comprises a fluorine-containing carbonic ester with the mass percentage of A percent, a sulfide with the mass percentage of B percent and a nitrile additive with the mass percentage of C percent;
wherein, the relation between a and A, B and C satisfies the following conditions: a/a is more than or equal to 2 and less than or equal to 5,0.7, B/a is more than or equal to 1.5,0.7, C/a is more than or equal to 1.5.
The secondary battery according to the embodiment of the invention has at least the following beneficial effects:
excessive pre-lithium may cause excessive lithium, so that lithium metal is plated on the surface of the negative electrode, resulting in potential safety hazards during charge and discharge operation of the battery cell, namely, over-lithiation may negatively affect the reversibility of lithium ion intercalation in the operation process, and insufficient pre-lithium cannot compensate for lithium consumed by irreversible reaction of the SEI film. The invention provides a secondary battery which meets the optimal relation between electrolyte additives and the pre-lithiation degree of a negative electrode plate, and controls the proportion of the optimal additives to the pre-lithiation degree by regulating and controlling the addition of different additives, so as to design the secondary battery which reduces the long-cycle expansion rate of a battery core, improves the retention rate of the cycle capacity and has good electrochemical performance and long cycle life.
According to some embodiments of the invention, the pre-lithiation degree is a, satisfying the relationship 3.ltoreq.a.ltoreq.5. Therefore, the selection of the range is more beneficial to improving the performance of the battery cell, improving the irreversible capacity loss and prolonging the cycle life.
According to some embodiments of the invention, the range of A is 6.ltoreq.A.ltoreq.16. The additive can generate a LiF-rich SEI film on the surface of the negative electrode, and the mechanical strength of the SEI film is obviously improved due to more inorganic matter content, so that the volume expansion of silicon is effectively inhibited, and the silicon cycle performance is improved. However, if the amount of the additive A is excessive (> 16), the electrolyte can interact with the electrolyte lithium salt to generate strong Lewis acid PF5 under high temperature condition, and then the reaction of F removal occurs to generate acidic products such as VC, HF and the like, so that the acidity of the electrolyte is increased, the structure of the negative electrode SEI is destroyed, the dissolution of the transition metal element of the positive electrode is caused, and the deposition of the positive electrode is caused, thereby the electric performance is deteriorated. Therefore, the selection of the range is more beneficial to improving the performance of the battery cell, improving the irreversible capacity loss and prolonging the cycle life.
According to some embodiments of the invention, the range of B is 2.ltoreq.B.ltoreq.5. When the B content is less than 2, the effect is not significantly improved, and when the B content is more than 5, the low temperature performance is deteriorated. Therefore, the selection of the range is more beneficial to improving the performance of the battery core, the high-temperature storage performance, the irreversible capacity loss and the cycle life.
According to some embodiments of the invention, the range of C is 3.ltoreq.C.ltoreq.6. The C can adjust the interface impedance of the positive electrode, and affects dynamics and storage performance; the complex positive electrode excessive metal ions can inhibit the dissolution of the positive electrode excessive metal ions, so that the high-temperature storage performance is improved, the complex positive electrode excessive metal ions are combined with oxygen, the positive electrode oxidation activity is inhibited, and the oxidation of the positive electrode to electrolyte is reduced. If the addition amount of C is more than 6, the polarization is large, the internal resistance is large, and the charging window and the low-temperature discharging performance are deteriorated. Therefore, the selection of the range is more beneficial to improving the performance of the battery cell, improving the irreversible capacity loss and prolonging the cycle life.
According to some embodiments of the invention, the a/a satisfies the following relationship: a/a is more than or equal to 2.5 and less than or equal to 3.
According to some embodiments of the invention, the B/a satisfies the following relationship: b/a is more than or equal to 0.75 and less than or equal to 1.
According to some embodiments of the invention, the C/a satisfies the following relationship: c/a is more than or equal to 0.75 and less than or equal to 1.
According to some embodiments of the invention, the pre-lithiation step of the negative electrode sheet is: dispersing lithium powder in an organic solvent, spraying the dispersion on a negative plate, and drying the residual organic solvent on the negative plate to obtain the pre-lithiated negative plate.
According to some embodiments of the invention, the pre-lithiation degree is calculated by:
obtaining the percentage of lithium element by ICP element analysis;
obtaining the percentage of Li+ in free lithium through a free lithium test;
the percentage of lithium element is subtracted by the percentage of Li+ in free lithium, which is the effective pre-lithiation degree (%).
According to some embodiments of the present invention, the fluorocarbonates include fluoroethylene carbonate, fluoropropylene carbonate, trifluoropropylene carbonate, difluoroethylene carbonate, fluoroalkylethylene carbonate, bis (trifluoromethyl) carbonate, bis (pentafluoroethyl) carbonate bis (2, 2 trifluoroethyl) carbonate, bis (2, 3-tetrafluoropropyl) carbonate, methyl-2, 2-trifluoroethyl carbonate at least one of ethyl-2, 2-trifluoroethyl carbonate, (2, 3-pentafluoropropyl) -methyl carbonate or bis (monofluoromethyl) carbonate.
According to some embodiments of the invention, the sulfide includes at least one of 1, 3-propane sultone, propylene sulfite, cyclopropanesulfonic acid, 4-methyl ethylene sulfite, dicyclopentadienyl sulfate, or vinyl sulfate.
According to some embodiments of the invention, the nitrile additive comprises at least one of 1, 4-dicyanobutane, 1, 2-dicyanoethane, 1, 3-dicyanopropane, 1, 6-dicyanohexane, sebaconitrile, 1,3, 5-pentanetrimethylnitrile, p-fluorobenzonitrile, p-methylbenzonitrile, 2-fluoroadiponitrile, 2-difluorosuccinonitrile, or tricyanobenzene.
According to some embodiments of the invention, the secondary battery further comprises a positive electrode sheet, a separator, and an electrolyte.
According to some embodiments of the invention, the separator comprises at least one of polyethylene, polypropylene, or polyvinylidene fluoride.
According to some embodiments of the invention, the negative electrode tab comprises a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, the negative electrode film layer comprising a negative electrode active material; the pre-lithiation degree of the anode active material is a.
According to some embodiments of the invention, the negative electrode active material includes at least one of graphite, a silicon oxygen material, a tin-based material, or a transition metal nitride.
According to some embodiments of the invention, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode film layer is provided on either or both of the two surfaces opposite to the negative electrode current collector.
According to some embodiments of the invention, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, copper foil or aluminum foil may be used. The composite current collector may include a polymeric material base layer and a metal layer formed on at least one surface of the polymeric material base material. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).
According to some embodiments of the invention, the negative electrode film layer further optionally includes a binder. The binder may be at least one selected from Styrene Butadiene Rubber (SBR), polyacrylic acid (PAA), sodium Polyacrylate (PAAs), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium Alginate (SA), polymethacrylic acid (PMAA), and carboxymethyl chitosan (CMCS).
According to some embodiments of the invention, the negative electrode film layer further optionally includes a conductive agent. The conductive agent is at least one selected from superconducting carbon, acetylene black, carbon black, ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers.
According to some embodiments of the invention, the positive electrode sheet comprises a positive electrode material comprising LiCoO 2 、LiNiO 2 、LiMnO 2 、LiMn 2 O 4 、LiMnPO 4 、LiFePO 4 、LiNi 1/3 Co 1/3 Mn 1/3 O 2 、LiNi 0.5 Co 0.2 Mn 0.3 O 2 、LiNi 0.6 Co 0.2 Mn 0.2 O 2 、LiNi 0.8 Co 0.1 Mn 0.1 O 2 、LiNi 0.85 Co 0.15 Al 0.05 O 2 At least one of (a) and (b).
According to some embodiments of the invention, the electrolyte further comprises an electrolyte salt and an organic solvent.
According to some embodiments of the invention, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis-fluorosulfonyl imide, lithium bis-trifluoromethylsulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalato borate, lithium difluorodioxaato phosphate, and lithium tetrafluorooxalato phosphate.
According to some embodiments of the invention, the organic solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methylethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylene carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1, 4-butyrolactone, sulfolane, dimethyl sulfone, methyl sulfone, and diethyl sulfone.
According to some embodiments of the present invention, the positive electrode tab, the negative electrode tab, and the separator may be manufactured into an electrode assembly through a winding process or a lamination process.
According to a second aspect of the present invention, there is provided an electrical device including the above-described secondary battery.
According to some embodiments of the present invention, the electric equipment of the present invention may include, for example, a mobile phone, a computer, a wearable device, a mobile power supply, an electric automobile, an energy storage device, and the like.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the embodiments, but the present invention is not limited to these embodiments.
The reagents, methods and apparatus employed in the present invention, unless otherwise specified, are all conventional in the art.
And (5) calculating the pre-lithiation degree: performing ICP elemental analysis and free lithium test on the pre-lithium silicon oxide material, and subtracting Li in the free lithium test result from the percentage of lithium element in the elemental analysis test result + The percentage of the ratio is the effective pre-lithiation degree a.
Silicon oxygen material: purchased from south kyo Baacket new materials limited.
Example 1
Example 1 provides a secondary battery, which is prepared by the following specific steps:
positive pole piece: to LiCoO as active substance 2 Acetylene black as a conductive agent, conductive carbon nanotubes and polyvinylidene fluoride (PVDF) as a binder according to the weight ratio of 97.6:0.6:0.5:1.3 fully and uniformly dispersing the aluminum current collector in an N-methyl pyrrolidone solvent system, and carrying out cold pressing after drying at 85 ℃; then trimming, cutting pieces, splitting, drying at 80 ℃ for 10 hours under vacuum condition after splitting, and welding the tab to prepare the positive pole piece.
Negative pole piece: graphite, a silicon oxide material, a conductive agent (conductive carbon nano tube) and a binder (CMC and SBR) according to the mass ratio of 93.7:2.9: preparing slurry according to the ratio of 0.4:3.0, coating the slurry on a current collector copper foil, drying at 85 ℃, cold pressing, trimming, cutting pieces, splitting, drying at 110 ℃ for 10 hours under vacuum condition after splitting, and welding the tab to prepare the negative electrode plate.
A pre-lithiation step: dispersing lithium powder in an organic solvent, spraying the dispersion on a silicon oxide negative plate, and drying the residual organic solvent on the negative plate to obtain a pre-lithiated silicon oxide negative plate; the data for the degree of prelithiation of a, a are shown in Table 1.
Isolation film: and coating the PE surface with a ceramic mixture as a separation film.
Electrolyte solution: ethylene Carbonate (EC), propylene Carbonate (PC), diethyl carbonate (DEC) and Propyl Propionate (PP) are mixed according to the volume ratio of 1:1:4:4: mixing followed by thoroughly drying the lithium salt LiPF 6 Dissolving in a mixed organic solvent according to a proportion of 1mol/L to prepare electrolyte. Then adding the additive A of the fluorine-containing carbonic ester, the additive B of the sulfide and the nitrile additive C. A. The contents of B and C are shown in Table 1.
The preparation method of the secondary battery comprises the following steps:
winding the positive pole piece, the diaphragm and the negative pole piece into a battery core, wherein the diaphragm is positioned between the positive pole piece and the negative pole piece, the positive pole is led out by spot welding of an aluminum tab, and the negative pole is led out by spot welding of a nickel tab; and then placing the battery core in an aluminum-plastic packaging bag, injecting the electrolyte, and preparing the secondary battery through the procedures of packaging, formation, capacity and the like.
Examples 2 to 7
Examples 2 to 7 provide a series of secondary batteries, which are different from example 1 in terms of the pre-lithiation degree a and A, B and C, in terms of raw materials and production methods. The specific data are shown in Table 1.
Comparative examples 1 to 4
Comparative examples 1 to 4 provide a series of secondary batteries, which are different in the pre-lithiation degree a and A, B and C from example 1 in the raw materials and the production methods thereof. The specific data are shown in Table 1.
TABLE 1
Performance testing
The cycle retention rate is that the battery core is charged to 4.2V at a step of 2.8C, the conversion rate is 1.8C, the battery core is charged to a cut-off voltage, and the residual capacity of 800 times of cycle accounts for the percentage of the initial capacity.
The expansion rate is that the battery core is charged to 4.2V in a step of 2.8C, the transformation ratio is 1.8C, the battery core is charged to a cut-off voltage, the thickness of a node is cycled for 100 weeks, and the difference value between the thickness and the initial thickness is the percentage of the initial thickness.
The multiplying power window is the maximum multiplying power corresponding to the battery cell without lithium separation after the battery cell is directly punched to the cut-off voltage under the conditions of 3.0C,2.8C,2.6C,2.4C,2.0C,1.8C,1.6C,1.4C,1.2C and 1.0C. The results are shown in Table 2.
Table 2 data for examples 1 to 7 and comparative examples 1 to 4
Capacity retention rate Expansion ratio Multiplying power window
Example 1 88％ 2.0％ 3.0C
Example 2 87％ 2.2％ 2.8C
Example 3 86％ 2.5％ 2.6C
Example 4 85％ 2.5％ 2.6C
Example 5 84％ 3.0％ 2.6C
Example 6 82％ 3.0％ 2.4C
Example 7 82％ 3.5％ 2.2C
Comparative example 1 79％ 4.0％ 2.2C
Comparative example 2 76％ 4.0％ 2.2C
Comparative example 3 76％ 4.2％ 2.0C
Comparative example 4 74％ 4.5％ 2.0C
As can be seen from examples 1 to 7 and comparative examples 1 to 4 in table 2, when the pre-lithiation degree a of the negative electrode sheet and the electrolyte satisfy the following relationship in the present invention: a/a is more than or equal to 2 and less than or equal to 5,0.7, B/a is more than or equal to 1.5,0.7 and C/a is more than or equal to 1.5, so that the long-cycle expansion rate of the battery core of the secondary battery prepared by the secondary battery is reduced, the cycle capacity retention rate is improved, and the cycle life is long.
The present invention has been described in detail with reference to the above embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.

Claims (10)

1. The secondary battery is characterized by comprising a negative electrode plate and electrolyte matched with the negative electrode plate; the negative electrode plate is subjected to pre-lithiation treatment, and the pre-lithiation degree is a; the electrolyte comprises a fluorine-containing carbonic ester with the mass percentage of A percent, a sulfide with the mass percentage of B percent and a nitrile additive with the mass percentage of C percent;
wherein, the relation between a and A, B and C satisfies the following conditions: a/a is more than or equal to 2 and less than or equal to 5,0.7, B/a is more than or equal to 1.5,0.7, C/a is more than or equal to 1.5.
2. The secondary battery according to claim 1, wherein the pre-lithiation degree is a, satisfying the relation 3.ltoreq.a.ltoreq.5.
3. The secondary battery according to claim 1, wherein a is in the range of 6.ltoreq.a.ltoreq.16.
4. The secondary battery according to claim 1, wherein B is in the range of 2.ltoreq.b.ltoreq.5.
5. The secondary battery according to claim 1, wherein the range of C is 3.ltoreq.c.ltoreq.6.
6. The secondary battery according to claim 1, wherein, the fluorine-containing carbonate comprises fluoroethylene carbonate, fluoropropylene carbonate, trifluoropropylene carbonate, difluoroethylene carbonate, fluoroalkyl ethylene carbonate, di (trifluoromethyl) carbonate, di (pentafluoroethyl) carbonate, and bis (2, 2 trifluoroethyl) carbonate, bis (2, 3-tetrafluoropropyl) carbonate, methyl-2, 2-trifluoroethyl carbonate at least one of ethyl-2, 2-trifluoroethyl carbonate, (2, 3-pentafluoropropyl) -methyl carbonate or bis (monofluoromethyl) carbonate.
7. The secondary battery according to claim 1, wherein the sulfide includes at least one of 1, 3-propane sultone, propylene sulfite, cyclopropanesulfonic acid, 4-methyl ethylene sulfite, dicyclo sulfate, or vinyl sulfate.
8. The secondary battery according to claim 1, wherein the nitrile additive comprises at least one of 1, 4-dicyanobutane, 1, 2-dicyanoethane, 1, 3-dicyanopropane, 1, 6-dicyanohexane, sebaconitrile, 1,3, 5-pentanetrimitrile, p-fluorobenzonitrile, p-methylbenzonitrile, 2-fluoroadiponitrile, 2-difluorosuccinonitrile, or tricyanobenzene.
9. The secondary battery according to claim 1, further comprising a positive electrode tab, a separator, and an electrolyte.
10. An electric device comprising the secondary battery according to any one of claims 1 to 9.
CN202311169634.5A 2023-09-12 2023-09-12 Secondary battery and electric device Pending CN117154222A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118572189A (en) * 2024-07-30 2024-08-30 广州天赐高新材料股份有限公司 Lithium ion battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118572189A (en) * 2024-07-30 2024-08-30 广州天赐高新材料股份有限公司 Lithium ion battery

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