CN107482253A - A kind of low-temperature lithium ion battery - Google Patents
A kind of low-temperature lithium ion battery Download PDFInfo
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- CN107482253A CN107482253A CN201710586275.1A CN201710586275A CN107482253A CN 107482253 A CN107482253 A CN 107482253A CN 201710586275 A CN201710586275 A CN 201710586275A CN 107482253 A CN107482253 A CN 107482253A
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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
- H01M10/058—Construction or manufacture
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention belongs to technical field of lithium ion, more particularly to a kind of low-temperature lithium ion battery, including positive plate, negative plate, barrier film and electrolyte；The positive electrode active materials of positive plate are ternary material adulterated lithium manganate, and the Surface coating fast-ionic conductor of ternary material；The negative active core-shell material of negative plate is graphite or agraphitic carbon coated graphite；Electrolyte includes lithium salts, solvent and additive, lithium salts LiPF6、LiBOB、LiODFB、LiFSI、LiTFSI、LiPO2F2In at least two mixing, the solubility of lithium salts is 1.0~1.5mol/L.Compared to prior art, invention carries out complex optimum by the material system to the positive plate of battery, negative plate and electrolyte and core strueture, reduce the interface impedance of battery at low temperatures, improve initial discharge voltage of the battery in ultra-low temperature surroundings so that battery can under 40 DEG C of big multiplying powers of ultralow temperature normal work.
Description
Technical field
The invention belongs to technical field of lithium ion, more particularly to a kind of low-temperature lithium ion battery.
Background technology
For lithium ion battery due to high with energy density, self discharge is low, has become shifting outstanding advantages of memory-less effect
The primary solutions of energy source, and mobile phone is widely used in, flat board, the multiple fields such as electric automobile and family's energy storage.Lithium
The use environment of ion battery is relative complex, therefore proposes higher requirement to the performance of lithium ion battery.Current lithium from
Sub- battery cryogenic property is relatively poor, has restricted lithium ion battery promoting the use of in electric automobile field, has been mainly manifested in
After temperature reduction (<0 DEG C) viscosity of lithium ion electrolyte inside rises, and the mobility of lithium ion is deteriorated, and lithium ion conductivity is anxious
Play declines, and inside battery polarization aggravation, separates out lithium dendrite arm in negative pole low potential, security risk is high, and general battery manufacturers are strict
Limit low temperature charging.Because polarization increases, lithium ion battery flash-over characteristic also drastically deteriorates.Electric discharge mileage substantially shortens.
In the prior art, heating be present in conventional lithium ion battery low temperature solution, predominantly battery bag external heating mode
Time length denounce, and battery system cost be significantly increased；One is molten for the low electrolyte of viscosity under addition low melting point, low temperature
Based on agent mode, while cryogenic property is lifted, the high-temperature behavior of battery, and prolonged cold cycle performance have been seriously undermined
It is difficult to ensure that, application field is more limited to.Wuhan Zhongju Energy Technology Co., Ltd. discloses Application No.
200910063261.7 patent of invention, a kind of positive pole main material is refer in invention as LiMn2O4 or the polymer of LiFePO4
Lithium ion battery, it can meet that -40 DEG C of low temperature discharge capacities reach the 70% of initial capacity, for the improvement unobvious in terms of charging；
Hunan Tianheng New Energy Co., Ltd. discloses the patent of invention of Application No. 201010534033.6, and one is refer in invention
Kind positive pole main material is one or more of polymer Li-ion batteries in LiMn2O4 or nickle cobalt lithium manganate, cobalt acid lithium, can meet-
The small multiplying power discharging capacity of 40 DEG C of low temperature 0.2C reaches more than the 85% of initial capacity, and discharge-rate is less, it is difficult to meets high-power car
Carry application.
The content of the invention
It is an object of the invention to：In view of the shortcomings of the prior art, it is high to provide a kind of energy density, -40 DEG C of ultralow temperature
The super-low-temperature lithium-ion cell that the big multiplying power discharging properties of 1C are good, normal-temperature circulating performance is excellent while high-temperature behavior is good.
To achieve these goals, the present invention uses following technical scheme：
A kind of low-temperature lithium ion battery, including positive plate, negative plate, the isolation being interval between positive plate and negative plate
Film, and electrolyte；
The positive electrode active materials of the positive plate are ternary material adulterated lithium manganate, and the Surface coating of the ternary material
Fast-ionic conductor.Lithium ion can be significantly reduced in the de- of positive-active layer by possessing the incorporation of the LiMn2O4 of three-dimensional lithium ion tunnel
Embedding speed, and lift the operating voltage of battery；Preferably Surface coating of the invention has the ternary material of fast-ionic conductor, using soon from
Sub- conductor conductor significantly reduces the surface impedance of resistance layer shape ternary, lifts dynamic performance.
The negative active core-shell material of the negative plate is graphite or agraphitic carbon coated graphite；The agraphitic carbon is soft
At least one of carbon, hard carbon, graphene；
The electrolyte includes lithium salts, solvent and additive, and the lithium salts is LiPF6、LiBOB、LiODFB、LiFSI、
LiTFSI、LiPO2F2In at least two mixing, the solubility of the lithium salts is 1.0~1.5mol/L.
As the preferred scheme of low-temperature lithium ion battery of the present invention, the LiMn2O4 accounts for the weight of positive electrode active materials
Amount is than being 3~20%；The weight ratio that the fast-ionic conductor accounts for positive electrode active materials is 0.01%~5.0%.
As the preferred scheme of low-temperature lithium ion battery of the present invention, the fast-ionic conductor is Li7La3Zr2O12、
Li14Zn(GeO4)4、Li3.3La0.56TiO3、LiTi2PO4At least one of.
As the preferred scheme of low-temperature lithium ion battery of the present invention, the ternary material is nickle cobalt lithium manganate, nickel
At least one of cobalt lithium aluminate, the median particle diameter D50 of the ternary material is 3~11 μm.Preferably half reunion half of the invention is single
The ternary material of crystalline form looks, middle small particle, using the small characteristic of primary particle in reunion state particle, reduce polarization and lithium under low temperature
Ion transfer impedance, obtain superior low-temperature performance；The class large single crystal pattern particle of proper content is present, beneficial to enhancing battery core low
Temperature is high temperature, safety and long circulating performance under electrolyte；Appropriate grain diameter is controlled, while cryogenic property is ensured,
Material compacting is not reduced, ensures battery energy density.
As the preferred scheme of low-temperature lithium ion battery of the present invention, the median particle diameter D50 of the LiMn2O4 for 3~
20μm。
As the preferred scheme of low-temperature lithium ion battery of the present invention, the graphite particle includes second particle and one
Secondary particle, the median particle diameter of the second particle is 3~20 μm, and the median particle diameter of the primary particle is 1 μm~10 μm.This hair
The preferred high power capacity fast charging type Delanium of bright negative active core-shell material, it is easy to embedding de- fast charging type Delanium using lithium ion,
Optimize conductive agent, binder formula simultaneously, so as to reduce low thermal resistance, obtain excellent cryogenic property.
As the preferred scheme of low-temperature lithium ion battery of the present invention, the solvent is ethylene carbonate (EC), carbon
Acid propylene ester (PC), dimethyl carbonate (DMC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), ethyl acetate (EA), third
At least one of acetoacetic ester (EP), methyl butyrate (MB), ethyl butyrate (EB), methyl esters (PA)；The additive is that carbonic acid is sub-
Vinyl acetate (VC), fluorinated ethylene carbonate (FEC), 1,3- propane sultones (PS), sulfuric acid vinyl ester (DTD), dipheryl carbonate
At least one of ester (DPC), methyl phenyl carbonate (MPC), succinic anhydride (SA), succinonitrile (SN), adiponitrile (AND).This hair
It is bright to optimize electrolyte prescription, using conventional carbonate as main solvent, the additives such as VC, FEC, PS of proper ratio are added, are introduced
The lithium salts of suitable concentration, overcome conventionally employed low melting point solvent to be difficult to take into account high temperature and macrocyclic problem, obtain superior low-temperature
While take into account high temperature and long circulating performance.
As the preferred scheme of low-temperature lithium ion battery of the present invention, the barrier film includes basement membrane and coated in base
Ceramic coating in film at least one side, the porosity of the barrier film are 30%~60%, the thickness of the barrier film for 12~
30μm；The basement membrane is one kind in polyolefin film, polyurethane film, aramid fiber film and non-woven fabrics；The ceramic coating is aluminum oxide
Coating, silica coating, barium sulfate coating or boehmite coating.
As the preferred scheme of low-temperature lithium ion battery of the present invention, the compacted density of the positive plate is more than or waited
In 3.2g/cm3, the compacted density of the negative plate is more than or equal to 1.4g/cm3。
As the preferred scheme of low-temperature lithium ion battery of the present invention, the thickness of the positive plate is 80~130 μm；
The thickness of the negative plate is 50~120 μm.
As the preferred scheme of low-temperature lithium ion battery of the present invention, the battery uses single rolled cores multi pole ears knot
Structure.The present invention can be effectively reduced the impedance of battery, be lifted the kinetics of battery using the multi pole ears structure design of optimization
Energy.
The beneficial effects of the present invention are：The present invention by the positive plate of ternary power lithium ion battery, negative plate and
The material system and core strueture of electrolyte carry out complex optimum, reduce interface impedance of the battery under ultralow temperature, improve
Initial discharge voltage of the battery in ultra-low temperature surroundings, makes it higher than discharge cut-off voltage, dexterously solves because of low temperature pole
Change increase, initial voltage is less than discharge voltage, the disadvantage ended of discharging, enables battery can normal work under ultralow temperature
Make.After low temperature normally starts electric discharge, battery of the invention by internal resistance itself obtain it is certain from heat production so that battery is actual
Environment temperature is raised, and reaches the similar effects with outside heat supply insulation so that ultra-low temperature discharge is continued, and is added without outside
Lithium-ion-power cell is solved the problems, such as under heat condition in the big multiplying power discharging differences of -40 DEG C of ultralow temperature 1C, and then overcomes battery
It is poor in extremely cold area discharge capability, the problem for the difficulty that charges.
Brief description of the drawings
Fig. 1 is discharge curve of the battery of embodiment 1 and comparative example 1 under -40 DEG C/1C in the present invention.
Fig. 2 is the positive/negative plate multi pole ears structural representation of the lithium ion battery of the present invention.
Embodiment
To make technical scheme and advantage clearer, below in conjunction with specific embodiment and Figure of description,
Technical scheme is clearly and completely described, it is clear that described embodiment is that a part of the invention is implemented
Example, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creativeness
The every other embodiment obtained under the premise of work, belongs to the scope of protection of the invention.
Embodiment 1
A kind of cylindrical ternary power super-low-temperature lithium-ion cell of the present invention, including the shell of cylinder, it is placed in shell
Interior core, electrolyte and battery cap, core are sequentially stacked and wound by negative plate, barrier film and positive plate and formed, electrolysis
Liquid is permeated in core, being provided with least two anode ears between battery cap and positive plate, and anode ear one end connects battery cap,
The other end connection positive plate of anode ear, is provided with least two negative electrode lugs, negative electrode lug one end connects between negative plate and outer casing bottom
Connect negative plate, the other end connected with outer casing bottom of negative electrode lug；Wherein, positive plate, barrier film, negative plate, electrolyte and battery core knot
The composition of structure is as follows：
Positive plate：Positive electrode active materials are nickle cobalt lithium manganate adulterated lithium manganate, and the Surface coating of nickle cobalt lithium manganate
Li7La3Zr2O12；In positive electrode active materials, nickle cobalt lithium manganate：LiMn2O4：Li7La3Zr2O12Percentage by weight be 90%:
8.0%:2.0%, and the median particle diameter D50 of ternary material is 3~11 μm；The median particle diameter D50 of LiMn2O4 is 3~20 μm；Lead
Electric agent is CNT, and binding agent is Kynoar；Wherein, positive electrode active materials：Conductive agent：The percentage by weight of binding agent
For 95%:3%:2%；Positive plate thickness is 100 μm, the compacted density 3.2g/cm of positive plate3。
Negative plate：Negative active core-shell material is Delanium, and synthetic graphite particles include secondary that median particle diameter is 15 μm
Grain and the primary particle that median particle diameter is 5 μm, conductive agent is conductive carbon black, and binding agent is butadiene-styrene rubber, wherein, negative electrode active material
Material：Conductive agent：The percentage by weight of binding agent is 95%:2.5%:2.5%；Negative plate thickness is 90 μm, the compacting of negative plate
Density 1.4g/cm3。
Barrier film：Basement membrane is polyethylene film, in the coated on both sides silica coating of polyethylene film, the hole of gained barrier film
Rate is 50%, and thickness is 12~30 μm.
Electrolyte：Electrolyte uses organic mixed solution of 1.4mol/L lithium salts, wherein, lithium salts uses lithium hexafluoro phosphate
With LiODFB mixing, by volume percentage, organic solvent EC:EMC:DMC=30%:30%:40%, and add 1%DTD
(mass ratio for accounting for electrolyte gross mass) and 1%VC (mass ratio for accounting for electrolyte gross mass) are used as film for additive.
Core strueture：Battery core uses single rolled cores multipole ear structure, and positive and negative lug aligning structure is as shown in Fig. 2 using optimization
Three extreme ear structures design.
Embodiment 2
As different from Example 1, the composition of positive plate, barrier film, negative plate and electrolyte is as follows：
Positive plate：Positive electrode active materials are nickel cobalt lithium aluminate adulterated lithium manganate, and the Surface coating Li of nickel cobalt lithium aluminate14Zn
(GeO4)4；In positive electrode active materials, nickel cobalt lithium aluminate：LiMn2O4：Li14Zn(GeO4)4Percentage by weight be 80%:
15%:5.0%, and the median particle diameter D50 of ternary material is 3~11 μm；The median particle diameter D50 of LiMn2O4 is 3~20 μm；It is conductive
Agent is CNT, and binding agent is Kynoar；Wherein, positive electrode active materials：Conductive agent：The percentage by weight of binding agent is
96%:2%:2%；Positive plate thickness is 80 μm, the compacted density 3.25g/cm of positive plate3。
Negative plate：Negative active core-shell material is graphene coated graphite, and it is 20 μm secondary that graphite particle, which includes median particle diameter,
Particle and the primary particle that median particle diameter is 10 μm, conductive agent is conductive carbon black, and binding agent is butadiene-styrene rubber, wherein, negative pole is lived
Property material：Conductive agent：The percentage by weight of binding agent is 97%:1.5:1.5%；Negative plate thickness is 50 μm, the pressure of negative plate
Real density 1.5g/cm3。
Barrier film：Basement membrane is polyethylene film, in the coated on both sides barium sulfate coating of polyethylene film, the hole of gained barrier film
Rate is 60%, and thickness is 12~30 μm.
Electrolyte：Electrolyte uses organic mixed solution of 1.5mol/L lithium salts, wherein, lithium salts uses lithium hexafluoro phosphate
With LiTFSI mixing, by volume percentage, organic solvent EC:EMC:DMC:=25%:25%:50%:And add 2%PS
(mass ratio for accounting for electrolyte gross mass) and 2%FEC (mass ratio for accounting for electrolyte gross mass) are used as film for additive.
Remaining is not being repeated here with embodiment 1.
Embodiment 3
As different from Example 1, the composition of positive plate, barrier film, negative plate and electrolyte is as follows：
Positive plate：Positive electrode active materials are nickel cobalt lithium aluminate adulterated lithium manganate, and the Surface coating of nickel cobalt lithium aluminate
Li3.3La0.56TiO3；In positive electrode active materials, nickel cobalt lithium aluminate：LiMn2O4：Li3.3La0.56TiO3Percentage by weight be
75%:20%:5.0%, and the median particle diameter D50 of ternary material is 3~11 μm；The median particle diameter D50 of LiMn2O4 is 3~20 μ
m；Conductive agent is CNT, and binding agent is Kynoar；Wherein, positive electrode active materials：Conductive agent：The weight hundred of binding agent
Divide than being 97%:1.5%:1.5%；Positive plate thickness is 130 μm, and the compacted density of positive plate is 3.2g/cm3。
Negative plate：Negative active core-shell material is hard carbon coated graphite, and graphite particle includes secondary that median particle diameter is 10 μm
Grain and the primary particle that median particle diameter is 1 μm, conductive agent is conductive carbon black, and binding agent is butadiene-styrene rubber, wherein, negative electrode active material
Material：Conductive agent：The percentage by weight of binding agent is 96.5%:2.0:1.5%；Negative plate thickness is 120 μm, the compacting of negative plate
Density 1.45g/cm3。
Barrier film：Basement membrane is polyethylene film, in the coated on both sides boehmite coating of polyethylene film, the hole of gained barrier film
Rate is 30%, and thickness is 12~30 μm.
Electrolyte：Electrolyte uses organic mixed solution of 1.0mol/L lithium salts, wherein, lithium salts uses lithium hexafluoro phosphate
And LiPO2F2Mixing, by volume percentage, organic solvent EC:EMC:DMC=25%:30%:45%:, and add 2%PS
(mass ratio for accounting for electrolyte gross mass) and 1.5%VC (mass ratio for accounting for electrolyte gross mass) are used as film for additive.
Remaining is not being repeated here with embodiment 1.
Comparative example 1
As different from Example 1, the composition of positive plate is as follows：Positive electrode active materials are nickle cobalt lithium manganate；90%:
10%, and the median particle diameter D50 of ternary material is 3~11 μm；Conductive agent is CNT, and binding agent is Kynoar；Its
In, positive electrode active materials：Conductive agent：The percentage by weight of binding agent is 95%:3%:2%；Positive plate thickness is 100 μm, just
The compacted density 3.2g/cm of pole piece3。
Remaining is not being repeated here with embodiment 1.
Comparative example 2
As different from Example 2, the composition of negative plate is as follows：During negative active core-shell material is graphite, and graphite particle is
It is worth the second particle that particle diameter is 20 μm, conductive agent is conductive carbon black, and binding agent is butadiene-styrene rubber, wherein, negative active core-shell material：Lead
Electric agent：The percentage by weight of binding agent is 97%:1.5:1.5%；Negative plate thickness is 50 μm, and the compacted density of negative plate is more than
Or equal to 1.5g/cm3。
Remaining is not being repeated here with embodiment 2.
Comparative example 3
As different from Example 3, the composition of electrolyte is as follows：Electrolyte uses organic mixing of 1.0mol/L lithium salts
Solution, wherein, lithium salts uses lithium hexafluoro phosphate, by volume percentage, organic solvent EC:EMC:DMC=25%:30%:
45%, and add 2%VC (mass ratio for accounting for electrolyte gross mass) and be used as film for additive.
Remaining is not being repeated here with embodiment 3.
Low temperature discharge is carried out to the battery of embodiment 1~3 and comparative example 1~3 respectively and cycle performance is tested.
Low temperature discharge experiment carries out as follows：In 1C/4.2V 25 DEG C of rings of constant current/constant voltage (CC/CV) condition and room temperature
Under border, each battery charges by 0.1C cut-off currents, is then ended at 25 DEG C with 1C/2.5V and discharged.Then with above-mentioned same
Quadrat method charges, and is then placed in standing more than 4h in -40 DEG C or -20 DEG C of cryogenic box, then end with 1C/2.5V and discharge.Record
The initial voltage of battery low temperature discharge, and -40 DEG C or -20 DEG C of low temperature discharge capacity ratios (%) are calculated by following formula：[(- 40
DEG C or -20 DEG C of discharge capacity)/(discharge capacity at 25 DEG C)] × 100%.Test result is as shown in table 1.
Cycle performance experiment carries out as follows：Under 1C/4.2V constant current/constant voltage (CC/CV) condition and room temperature environment,
Each battery is by the charging of 0.1C cut-off currents and 1C/3.0V cut-off electric discharges.Pass through the capacity of following formula calculating in each cycle
Conservation rate (%)：[(in the discharge capacity of particular cycle)/(in the discharge capacity of first circulation)] × 100%.Test result is such as
Shown in table 1.
The battery low temperature performance and cycle performance of the embodiment of table 1 and comparative example test test result
From the test result of table 1,1C discharge initiation voltages are all higher than 2.9V at -40 DEG C of battery of the invention；Normal temperature
1C circulates 2000 weeks capability retention >=80%；Big multiplying power discharging capability retention >=70% of -40 DEG C of ultralow temperature 1C；- 20 DEG C super
Big multiplying power discharging capability retention >=80% of low temperature 1C.And use the comparative example 1 of conventional cathode piece, pair using conventional anode piece
Ratio 2 and the comparative example 3 using conventional electrolysis liquid, the big multiplying power discharging property of its low temperature and normal-temperature circulating performance are than corresponding
Embodiment it is poor, show of the invention there is the more excellent big multiplying power discharging property of low temperature and normal-temperature circulating performance.
Wherein, the discharge curve under -40 DEG C/1C is made to the battery of embodiment 1 and comparative example 1, as shown in Figure 1.
From Fig. 1 discharge curve, when just starting, the battery core of embodiment 1 is under the big multiplying powers of -40 DEG C/1C, due to interface
Impedance is relatively low, and initial discharge voltage is more than discharge cut-off voltage, thus electric discharge is normally carried out；With the progress of electric discharge, ultralow temperature
Electric discharge heat production exists simultaneously with ultralow temperature polarization, but the still too late low temperature that makes up of heat production polarizes, thus voltage drop occurs in discharge curve
Low flex point；With the lasting progress of electric discharge, ultra-low temperature discharge carry out process heat production to battery core provide one it is lasting in
Heating system, battery core actual temperature substantially rises, thus the peak point that voltage is obviously improved occurs in discharge curve.Opposite, it is right
The battery core of ratio 1 is less than discharge cut-off voltage due to initial voltage so that can not be discharged under ultralow temperature, thus can not obtain it and put
Electric curve.
In addition, following security performance test is carried out to the battery of embodiment 1~3 and comparative example 1~3 respectively：It is small that 1C overcharges 1
When, external short circuit 10 minutes, 130 DEG C of thermal shocks 30 minutes, the high free-electron models of 1.5m；Observation battery whether occur leakage, it is on fire,
Explosive event, if leakage occurs, on fire, blast is designated as "Yes", if without leakage, without it is on fire, without blast be designated as "No".
The battery safety test result of the embodiment of table 2 and comparative example
From the test result of table 2, leakage, situation on fire, blast, security performance do not occur for battery of the invention
Test percent of pass is up to 100%；And leakage, situation showed increased on fire, blast, security occur for the battery of comparative example 1~3
Percent of pass can be tested and only have 33%, show battery of the invention has higher security performance.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and changed.Therefore, the invention is not limited in above-mentioned embodiment, every those skilled in the art exist
Made any conspicuously improved, replacement or modification belong to protection scope of the present invention on the basis of the present invention.This
Outside, although having used some specific terms in this specification, these terms merely for convenience of description, not to the present invention
Form any restrictions.
Claims (10)
1. a kind of low-temperature lithium ion battery, including positive plate, negative plate, the barrier film being interval between positive plate and negative plate,
And electrolyte, it is characterised in that：
The positive electrode active materials of the positive plate are ternary material adulterated lithium manganate, and the Surface coating of the ternary material soon from
Sub- conductor；
The negative active core-shell material of the negative plate is graphite or agraphitic carbon coated graphite；
The electrolyte includes lithium salts, solvent and additive, and the lithium salts is LiPF6、LiBOB、LiODFB、LiFSI、LiTFSI、
LiPO2F2In at least two mixing, the solubility of the lithium salts is 1.0~1.5mol/L.
2. low-temperature lithium ion battery according to claim 1, it is characterised in that：The LiMn2O4 accounts for positive electrode active materials
Weight ratio is 3~20%；The weight ratio that the fast-ionic conductor accounts for positive electrode active materials is 0.01%~5.0%.
3. low-temperature lithium ion battery according to claim 1, it is characterised in that：The fast-ionic conductor is
Li7La3Zr2O12、Li14Zn(GeO4)4、Li3.3La0.56TiO3、LiTi2PO4At least one of.
4. low-temperature lithium ion battery according to claim 1, it is characterised in that：The ternary material be nickle cobalt lithium manganate,
At least one of nickel cobalt lithium aluminate, the median particle diameter D50 of the ternary material is 3~11 μm.
5. low-temperature lithium ion battery according to claim 1, it is characterised in that：The median particle diameter D50 of the LiMn2O4 is 3
~20 μm.
6. low-temperature lithium ion battery according to claim 1, it is characterised in that：The graphite particle include second particle and
Primary particle, the median particle diameter of the second particle is 3~20 μm, and the median particle diameter of the primary particle is 1 μm~10 μm.
7. low-temperature lithium ion battery according to claim 1, it is characterised in that：The solvent be EC, DMC, EMC, DEC,
At least one of PC, EP, EA, PA, MB, EB；The additive is in VC, FEC, PS, DTD, DPC, MPC, SA, SN, AND
It is at least one.
8. low-temperature lithium ion battery according to claim 1, it is characterised in that：The barrier film includes basement membrane and is coated in
Ceramic coating in basement membrane at least one side, the porosity of the barrier film is 30%~60%.
9. low-temperature lithium ion battery according to claim 1, it is characterised in that：The compacted density of the positive plate be more than or
Equal to 3.2g/cm3, the compacted density of the negative plate is more than or equal to 1.4g/cm3。
10. low-temperature lithium ion battery according to claim 1, it is characterised in that：The battery uses single rolled cores multi pole ears
Structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108520947A (en) * | 2018-04-08 | 2018-09-11 | 广州鹏辉能源科技股份有限公司 | Modified phosphate iron lithium material, lithium ion battery, power battery pack and its application |
| CN109671974A (en) * | 2018-12-10 | 2019-04-23 | 江苏天鹏电源有限公司 | A kind of low temperature fast charge long-life high power dynamic lithium battery |
| CN109888368A (en) * | 2019-03-05 | 2019-06-14 | 深圳鸿鹏新能源科技有限公司 | Low-temperature lithium ion battery |
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| CN113138221A (en) * | 2021-04-20 | 2021-07-20 | 合肥国轩高科动力能源有限公司 | Method for optimizing proportion representation SEI film impedance of conductive agent and binder |
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| CN111525099A (en) * | 2019-02-02 | 2020-08-11 | 宁德时代新能源科技股份有限公司 | Sodium ion battery |
| CN111525099B (en) * | 2019-02-02 | 2021-08-06 | 宁德时代新能源科技股份有限公司 | Sodium ion battery |
| CN109888368A (en) * | 2019-03-05 | 2019-06-14 | 深圳鸿鹏新能源科技有限公司 | Low-temperature lithium ion battery |
| CN110233291A (en) * | 2019-05-31 | 2019-09-13 | 骆驼集团新能源电池有限公司 | A kind of wide temperate zone lithium battery electrolytes of 12V start and stop balancing high/low temperature |
| CN110854362A (en) * | 2019-08-27 | 2020-02-28 | 龙能科技(宁夏)有限责任公司 | Preparation method of low-temperature lithium ion battery negative plate |
| CN110854362B (en) * | 2019-08-27 | 2022-08-16 | 保力新能源科技股份有限公司 | Preparation method of low-temperature lithium ion battery negative plate |
| CN110676515A (en) * | 2019-08-27 | 2020-01-10 | 龙能科技(宁夏)有限责任公司 | Preparation method of low-temperature high-energy-density lithium ion battery |
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| CN110931881A (en) * | 2019-12-02 | 2020-03-27 | 深圳市宜加新能源科技有限公司 | High-rate charge-discharge polymer lithium ion battery and manufacturing method thereof |
| US11742518B2 (en) | 2019-12-24 | 2023-08-29 | Ningde Amperex Technology Limited | Electrolyte, and electrochemical device and electronic device using the same |
| CN112119530A (en) * | 2019-12-24 | 2020-12-22 | 宁德新能源科技有限公司 | Electrolyte solution, and electrochemical device and electronic device using same |
| WO2021127993A1 (en) * | 2019-12-24 | 2021-07-01 | 宁德新能源科技有限公司 | Electrolyte and electrochemical device using same, and electronic device |
| CN111952584A (en) * | 2020-07-13 | 2020-11-17 | 深圳市秸川材料科技有限公司 | Lithium battery |
| CN112002892A (en) * | 2020-08-20 | 2020-11-27 | 天津空间电源科技有限公司 | Cylindrical lithium ion battery with quick charging performance |
| CN112289989A (en) * | 2020-10-12 | 2021-01-29 | 常州高态信息科技有限公司 | Ultralow-temperature lithium iron phosphate lithium ion battery |
| CN112086685A (en) * | 2020-10-26 | 2020-12-15 | 长兴中俄新能源材料技术研究院 | Three-lithium salt-quaternary solvent system performance complementary type 5V lithium ion battery electrolyte |
| CN112086685B (en) * | 2020-10-26 | 2024-03-08 | 长兴中俄新能源材料技术研究院 | Trilithium salt-quaternary solvent system performance complementary type 5V lithium ion battery electrolyte |
| CN113138221A (en) * | 2021-04-20 | 2021-07-20 | 合肥国轩高科动力能源有限公司 | Method for optimizing proportion representation SEI film impedance of conductive agent and binder |
| CN113140782A (en) * | 2021-05-27 | 2021-07-20 | 星恒电源股份有限公司 | High-performance and low-cost lithium ion power battery and preparation method thereof |
| CN113140782B (en) * | 2021-05-27 | 2024-04-26 | 星恒电源股份有限公司 | High-performance low-cost lithium ion power battery and preparation method thereof |
| CN114447440A (en) * | 2021-12-29 | 2022-05-06 | 天津先众新能源科技股份有限公司 | Lithium iron phosphate battery with low-temperature high-rate discharge performance and manufacturing method thereof |
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