CN107221701A - A kind of extended-life lithium ion battery and preparation method thereof - Google Patents
A kind of extended-life lithium ion battery and preparation method thereof Download PDFInfo
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- CN107221701A CN107221701A CN201710364652.7A CN201710364652A CN107221701A CN 107221701 A CN107221701 A CN 107221701A CN 201710364652 A CN201710364652 A CN 201710364652A CN 107221701 A CN107221701 A CN 107221701A
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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
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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
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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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
Abstract
The present invention relates to a kind of extended-life lithium ion battery and preparation method thereof, the battery includes anode pole piece, cathode pole piece, barrier film and electrolyte, and the electrolyte includes lithium salts, organic solvent and additive；Wherein, additive is such as R O (O=) C C C (=O) R1Shown compound.Preparation method includes：Anode pole piece, cathode pole piece and barrier film are fabricated to lithium ion battery cell, shell uses plastic-aluminum packaging film or box hat；Then battery core is placed in vacuum drying oven and dried；After battery core is cooled to room temperature, electrolyte is injected, is produced after sealing.The service life for the extended-life lithium ion battery that the present invention is provided is significantly improved.
Description
Technical field
The invention belongs to field of lithium ion battery, more particularly to a kind of extended-life lithium ion battery and preparation method thereof.
Background technology
The development of electric automobile, wind/emerging strategic industries such as light generating and intelligent grid is required for advanced battery technology
Support, wherein lithium ion battery have small volume, it is lightweight, have extended cycle life, temperature in use scope is wide and power characteristic is good
The advantages of, it is wherein important developing direction and focus.
Lithium ion battery can cause the drop that declines of battery performance, be mainly shown as battery during long-term circulation and storage
The increase of decay, the internal resistance of capacity and power-performance reduction, influenceing the factor of its service life mainly has following several respects：(1)
Bulk effect.Because there is bulk effect (cobalt acid lithium in discharge and recharge in battery anode and cathode active materials：1.9%；Ternary：3%；
LiMn2O4：6.5%；LiFePO4：6.8%；Graphite：13.1%；Silicon：300%；Silicon monoxide：200%；Lithium titanate：Almost
Zero, but paired positive pole has bulk effect), cause positive and negative electrode that contraction and expansion repeatedly occurs, Volume Changes are produced
Stress on the one hand cause active material particle fragmentation, capacity reduction, on the other hand cause the combination of active material and collector
Power is reduced, or even active material is occurred and come off, battery capacity decay.(2) graphite cathode surface solid electrolyte (SEI) film.Stone
The SEI films of black negative terminal surface are constantly decomposed, recombinate and thickened in circulation or storage process, cause inside battery to be recycled Li+'s
Lasting consumption, impedance increase, battery capacity decline.(3) positive electrode active materials dissolve.Circulated for a long time and storage process in battery
In, due to the lithium salts LiPF in electrolyte6With trace water reaction generation HF, positive electrode active materials are caused to dissolve, active matter quality
Reduce, the metal ion such as Mn of generation2+、Fe2+And Co2+Deng being reduced in negative terminal surface, deposit, hinder Li+Transmission；Meanwhile,
Anolyte portion side reaction product is deposited on positive electrode surface, causes its impedance increase.(4) other factorses.Such as the burn into of collector
Decomposition of binding agent etc..In fact, lithium ion battery bad environments, especially summer in actual applications, often it is in 55~
Discharge and recharge or floating charge are carried out at a temperature of 60 DEG C of even more highs, simultaneously because performance is inconsistent between monomer caused by production process
Sex chromosome mosaicism causes the actual cycle life-span after battery combo to have a greatly reduced quality, and causes service life not reach user's expection, causes
Market segment promotes difficult.Therefore, the service life for improving lithium ion battery is most important.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of extended-life lithium ion battery and preparation method thereof, the lithium from
The service life of sub- battery is significantly improved.
A kind of extended-life lithium ion battery of the present invention, the battery includes anode pole piece, cathode pole piece, barrier film and electrolysis
Liquid, the electrolyte includes lithium salts, organic solvent and additive；Wherein, additive is such as R-O- (O=) C-C-C (=O)-R1
Shown compound, R and R1Alkyl C is represented independently of one anothernH2n+1, alkyl containing halogen (Cl, Br, I) or carbon atom connection
There are the substituent of heterocyclic, 1≤n≤12.
The anode pole piece by mass percentage, including 90~99.4% positive active materials, 0.3~4% conductive agent,
0.3~6% binding agent and collector；The collector is utter misery aluminium foil.
The cathode pole piece by mass percentage, including 90~97.5% negative electrode active materials, 0.5~3% conductive agent, 2
~7% binding agent and collector；The collector is utter misery copper foil.
The barrier film includes polyalkene diaphragm substrate and ceramic layer.
The polyalkene diaphragm substrate is one or both of polyethylene, polypropylene.
The polyalkene diaphragm substrate single or double sputtering has ceramic layer；The ceramic layer is Al2O3、TiO2、SiO2With
ZrO2In one kind, one side thickness be 10~500nm, preferably 20~200nm.
The lithium salts is selected from LiClO4、LiCFSO3、LiPF6、LiBF4、LiAsF6, LiBOB, LiODFB and LiN (CF3SO3)2
In one or more, concentration be 1~2M.It is preferred that LiPF6, concentration preferably 1~1.5M.
The organic solvent is selected from ethylene carbonate EC, propene carbonate PC, dimethyl carbonate DMC, diethyl carbonate
One or more in DEC, methyl ethyl carbonate EMC and vinylene carbonate VC.
The addition of the additive is 0.001~10%, preferably the 0.001~1% of electrolyte quality.
A kind of preparation method of extended-life lithium ion battery of the present invention, including：
(1) anode pole piece, cathode pole piece and barrier film are fabricated to lithium ion battery cell in the form of winding or lamination,
Shell uses plastic-aluminum packaging film or box hat；
(2) battery core made from step (1) is placed in vacuum drying oven and dried, arrange parameter：80~100 DEG C of temperature, vacuum
Spend for≤- 80Kpa, the time is 8~24h, and an argon gas is during which replaced per 2h；
(3) after battery core is cooled to room temperature, electrolyte is injected, electrolyte content is 1.6~5g/Ah, and longevity is produced after sealing
Order lithium ion battery.
Beneficial effect
(1) additive in electrolyte of the present invention can be aligned in positive electrode surface formation passivating film, the HF suppressed in electrolyte
The erosion of pole active material, it is to avoid influence of the dissolving, deposition of metal ion to battery performance.
(2) use of utter misery aluminium foil and utter misery copper foil of the present invention, can reduce connecing between positive and negative electrode material and collector
Get an electric shock and hinder, and adhesive ability between the two can be improved, while the usage amount of binding agent can be reduced, collector can be protected to prevent it
It is corroded and aoxidizes, extends battery.
(3) using sputtering ceramic diaphragm, the adhesion of ceramic layer and diaphragm matrix is improved, it is to avoid existing ceramic diaphragm exists
" dry linting " phenomenon during use, improve barrier film resistance to Li dendrite penetration capacity and oxidation resistance, further improve lithium from
The security and cycle life of sub- battery.
Brief description of the drawings
1C cycle performance curves of the Fig. 1 for embodiment 1 and the battery of the making of comparative example 1 at room temperature；
1C cycle performance curves of the Fig. 2 for embodiment 2 and the battery of the making of comparative example 2 at room temperature.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
Embodiment 1
Positive pole by active material lithium-nickel-cobalt manganese oxygen (NCM111), conductive agent KS6, SP and binding agent PVDF in mass ratio
93.5:1:3:2.5 compositions, solid content is 62.5%.First PVDF is dissolved in NMP, conductive agent is then separately added into mixing
In liquid, then active material added, be mixed to form the qualified anode sizing agent of viscosity.Slurry crosses 200 mesh sieves, then coats slurry
In in utter misery aluminum foil current collector, coated face density is 256g/m2, heating, drying volatilizees by NMP under the conditions of 80 DEG C.It will be coated with
Into electrode roll-in on roll squeezer, compacted density is 3.3g/cm3.Positive pole is cut to growth 865mm, width 56mm pole piece,
Drying moisture in vacuum drying oven (80 DEG C).
Negative pole is by active material graphite, conductive agent SP, binding agent CMC and SBR by weight 92.7:3:1.6:2.7 compositions,
Solid content is 48.8%.First by binding agent CMC dissolvings in deionized water, then conductive agent is added in mixed liquor, then will be living
Property material add, be eventually adding SBR, be mixed to form the qualified cathode size of viscosity.Slurry crosses 200 mesh sieves, then applies slurry
It is overlying in utter misery copper foil current collector, coated face density is 142g/m2, heating, drying is by moisture evaporation under the conditions of 80 DEG C.It will apply
Electrode roll-in on roll squeezer that cloth is completed, compacted density is 1.5g/cm3.Negative pole is cut to growth 920mm, width 58mm pole
Piece, the drying moisture in vacuum drying oven (80 DEG C).
The preparation method of ceramic diaphragm is as follows：Reactive sputtering is carried out in the atmosphere of reacting gas using metallic aluminium target,
The depositing Al on PP barrier films (thick 20 μm)2O3Ceramic layer.I.e. in high vacuum state (3 × 10-3Pa under), it is filled with working gas (argon
Gas) and reacting gas (oxygen) and reach suitable vacuum (1~8 × 10-1Pa), loaded on magnetic controlled sputtering target one initial high
Voltage (600-800V) so that gas produces glow discharge, electronics is under the influence of a magnetic field constantly and gas molecule collision so that
Glow discharge is continued, and the operating voltage of adjustment target is 400-600V, and operating current is 20-140A.Aluminium target is banged by ion
Hit and produce sputtering, reaction generation Al2O3After deposit to PP surfaces formed ceramic layer, Al2O3The thickness of ceramic layer is 200nm.
Positive and negative plate is welded into lug respectively, and the PP barrier films (thick 20 μm) of sputtered ceramic layer are wound into 18650 electricity together
Core, after entering shell, point bottom, slot rolling, welding cap cap, battery core is placed in vacuum drying oven, parameter is 80~90 DEG C of temperature, vacuum is
≤ -80Kpa, the time is 8~24h, and an argon gas is during which replaced per 2h.
After battery core is cooled to room temperature, electrolyte (1.2M LiPF are injected6EC:DMC:EMC(1:1:1, vol)+1wt% third
Acid dimethyl), electrolyte content is to obtain lithium ion battery after 4.8g, sealing.Battery is stood after 24h at room temperature, carried out
Room temperature is melted into, and fertilizer alleviant is 0.05C charging 1h, and 0.1C is charged to 4.2V, turns constant-voltage charge, then 0.1C is discharged to 3.0V.Chemical conversion
Battery afterwards carries out room temperature 1C charge and discharge cycles, as a result as shown in Figure 1.
Embodiment 2
Positive pole is by active material LiFePO4, conductive agent KS6, SP and binding agent PVDF in mass ratio 93.5:1:3:2.5 group
Into solid content is 62.5%.First PVDF is dissolved in NMP, then conductive agent is separately added into mixed liquor, then by active matter
Matter is added, and is mixed to form the qualified anode sizing agent of viscosity.Slurry crosses 200 mesh sieves, and slurry then is coated on into utter misery aluminium foil afflux
On body, coated face density is 260.1g/m2, heating, drying volatilizees by NMP under the conditions of 80 DEG C.The electrode completed will be coated with roller
Roll-in on press, compacted density is 2.2g/cm3.Positive pole is cut to growth 745mm, width 56mm pole piece, in vacuum drying oven (80
DEG C) middle drying moisture.
Negative pole is by active material graphite, conductive agent SP, binding agent CMC and SBR by weight 92.7:3:1.6:2.7 compositions,
Solid content is 48.8%.First by binding agent CMC dissolvings in deionized water, then conductive agent is added in mixed liquor, then will be living
Property material add, be eventually adding SBR, be mixed to form the qualified cathode size of viscosity.Slurry crosses 200 mesh sieves, then applies slurry
It is overlying in utter misery copper foil current collector, coated face density is 142g/m2, heating, drying is by moisture evaporation under the conditions of 80 DEG C.It will apply
Electrode roll-in on roll squeezer that cloth is completed, compacted density is 1.5g/cm3.Negative pole is cut to growth 800mm, width 58mm pole
Piece, the drying moisture in vacuum drying oven (80 DEG C).
The preparation method of ceramic diaphragm is as follows：Reactive sputtering is carried out in the atmosphere of reacting gas using metallic aluminium target,
The depositing Al on PP barrier films (thick 20 μm)2O3Ceramic layer.I.e. in high vacuum state (3 × 10-3Pa under), it is filled with working gas (argon
Gas) and reacting gas (oxygen) and reach suitable vacuum (1~8 × 10-1Pa), loaded on magnetic controlled sputtering target one initial high
Voltage (600-800V) so that gas produces glow discharge, electronics is under the influence of a magnetic field constantly and gas molecule collision so that
Glow discharge is continued, and the operating voltage of adjustment target is 400-600V, and operating current is 20-140A.Aluminium target is banged by ion
Hit and produce sputtering, reaction generation Al2O3After deposit to PP surfaces formed ceramic layer, Al2O3The thickness of ceramic layer is 50nm.
Positive and negative plate is welded into lug respectively, and the PP barrier films (thick 20 μm) of sputtered ceramic layer are wound into 18650 electricity together
Core, after entering shell, point bottom, slot rolling, welding cap cap, battery core is placed in vacuum drying oven, parameter is 80~90 DEG C of temperature, vacuum is
≤ -80Kpa, the time is 8~24h, and an argon gas is during which replaced per 2h.
After battery core is cooled to room temperature, electrolyte (1.2M LiPF are injected6EC:DMC:EMC(1:1:1, vol)+1wt% third
Acid dimethyl), electrolyte content is to obtain lithium ion battery after 4.8g, sealing.Battery is stood after 24h at room temperature, carried out
Room temperature is melted into, and fertilizer alleviant is 0.05C charging 1h, and 0.1C is charged to 4.2V, turns constant-voltage charge, then 0.1C is discharged to 3.0V.Chemical conversion
Battery afterwards carries out room temperature 1C charge and discharge cycles, as a result as shown in Figure 2.
Comparative example 1
Positive pole by active material lithium-nickel-cobalt manganese oxygen (NCM111), conductive agent KS6, SP and binding agent PVDF in mass ratio
93.5:1:3:2.5 compositions, solid content is 62.5%.First PVDF is dissolved in NMP, conductive agent is then separately added into mixing
In liquid, then active material added, be mixed to form the qualified anode sizing agent of viscosity.Slurry crosses 200 mesh sieves, then coats slurry
In in utter misery aluminum foil current collector, coated face density is 256g/m2, heating, drying volatilizees by NMP under the conditions of 80 DEG C.It will be coated with
Into electrode roll-in on roll squeezer, compacted density is 3.3g/cm3.Positive pole is cut to growth 865mm, width 56mm pole piece,
Drying moisture in vacuum drying oven (80 DEG C).
Negative pole is by active material graphite, conductive agent SP, binding agent CMC and SBR by weight 92.7:3:1.6:2.7 compositions,
Solid content is 48.8%.First by binding agent CMC dissolvings in deionized water, then conductive agent is added in mixed liquor, then will be living
Property material add, be eventually adding SBR, be mixed to form the qualified cathode size of viscosity.Slurry crosses 200 mesh sieves, then applies slurry
It is overlying in utter misery copper foil current collector, coated face density is 142g/m2, heating, drying is by moisture evaporation under the conditions of 80 DEG C.It will apply
Electrode roll-in on roll squeezer that cloth is completed, compacted density is 1.5g/cm3.Negative pole is cut to growth 920mm, width 58mm pole
Piece, the drying moisture in vacuum drying oven (80 DEG C).
Positive and negative plate is welded into lug respectively, and PP barrier films (thick 20 μm) are wound into 18650 battery cores together, through entering shell, point
After bottom, slot rolling, welding cap cap, battery core is placed in vacuum drying oven, parameter is 80~90 DEG C of temperature, vacuum is≤- 80Kpa, when
Between be 8~24h, during which per 2h replace an argon gas.
After battery core is cooled to room temperature, electrolyte (1.2M LiPF are injected6EC:DMC:EMC(1:1:1, vol)+1wt% third
Acid dimethyl), electrolyte content is to obtain lithium ion battery after 4.8g, sealing.Battery is stood after 24h at room temperature, carried out
Room temperature is melted into, and fertilizer alleviant is 0.05C charging 1h, and 0.1C is charged to 4.2V, turns constant-voltage charge, then 0.1C is discharged to 3.0V.Chemical conversion
Battery afterwards carries out room temperature 1C charge and discharge cycles, as a result as shown in Figure 1.
Comparative example 2
Positive pole is by active material LiFePO4, conductive agent KS6, SP and binding agent PVDF in mass ratio 93.5:1:3:2.5 group
Into solid content is 62.5%.First PVDF is dissolved in NMP, then conductive agent is separately added into mixed liquor, then by active matter
Matter is added, and is mixed to form the qualified anode sizing agent of viscosity.Slurry crosses 200 mesh sieves, and slurry then is coated on into utter misery aluminium foil afflux
On body, coated face density is 260.1g/m2, heating, drying volatilizees by NMP under the conditions of 80 DEG C.The electrode completed will be coated with roller
Roll-in on press, compacted density is 2.2g/cm3.Positive pole is cut to growth 745mm, width 56mm pole piece, in vacuum drying oven (80
DEG C) middle drying moisture.
Negative pole is by active material graphite, conductive agent SP, binding agent CMC and SBR by weight 92.7:3:1.6:2.7 compositions,
Solid content is 48.8%.First by binding agent CMC dissolvings in deionized water, then conductive agent is added in mixed liquor, then will be living
Property material add, be eventually adding SBR, be mixed to form the qualified cathode size of viscosity.Slurry crosses 200 mesh sieves, then applies slurry
It is overlying in utter misery copper foil current collector, coated face density is 142g/m2, heating, drying is by moisture evaporation under the conditions of 80 DEG C.It will apply
Electrode roll-in on roll squeezer that cloth is completed, compacted density is 1.5g/cm3.Negative pole is cut to growth 800mm, width 58mm pole
Piece, the drying moisture in vacuum drying oven (80 DEG C).
Positive and negative plate is welded into lug respectively, and PP barrier films (thick 20 μm) are wound into 18650 battery cores together, through entering shell, point
After bottom, slot rolling, welding cap cap, battery core is placed in vacuum drying oven, parameter is 80~90 DEG C of temperature, vacuum is≤- 80Kpa, when
Between be 8~24h, during which per 2h replace an argon gas.
After battery core is cooled to room temperature, electrolyte (1.2M LiPF are injected6EC:DMC:EMC(1:1:1, vol)+1wt% third
Acid dimethyl), electrolyte content is to obtain lithium ion battery after 4.8g, sealing.Battery is stood after 24h at room temperature, carried out
Room temperature is melted into, and fertilizer alleviant is 0.05C charging 1h, and 0.1C is charged to 4.2V, turns constant-voltage charge, then 0.1C is discharged to 3.0V.Chemical conversion
Battery afterwards carries out room temperature 1C charge and discharge cycles, as a result as shown in Figure 2.
As seen from Figure 1, Figure 2, the lithium ion battery made using the method that provides of the present invention, its cycle life apparently higher than
The battery that conventional method makes.
Claims (10)
1. a kind of extended-life lithium ion battery, the battery includes anode pole piece, cathode pole piece, barrier film and electrolyte, its feature
It is：The electrolyte includes lithium salts, organic solvent and additive；Wherein, additive be as R-O- (O=) C-C-C (=O)-
R1Shown compound, R and R1Alkyl C is represented independently of one anothernH2n+1, halogen-containing alkyl or carbon atom be connected with heterocycle
The substituent of class, 1≤n≤12.
2. a kind of extended-life lithium ion battery according to claim 1, it is characterised in that：The anode pole piece presses quality hundred
Divide ratio, including 90~99.4% positive active materials, 0.3~4% conductive agent, 0.3~6% binding agent and collector；The collection
Fluid is utter misery aluminium foil.
3. a kind of extended-life lithium ion battery according to claim 1, it is characterised in that：The cathode pole piece presses quality hundred
Divide ratio, including 90~97.5% negative electrode active materials, 0.5~3% conductive agent, 2~7% binding agents and collector；The afflux
Body is utter misery copper foil.
4. a kind of extended-life lithium ion battery according to claim 1, it is characterised in that：The barrier film include polyolefin every
Film substrate and ceramic layer.
5. a kind of extended-life lithium ion battery according to claim 4, it is characterised in that：The polyalkene diaphragm substrate is
One or both of polyethylene, polypropylene.
6. a kind of extended-life lithium ion battery according to claim 4, it is characterised in that：The polyalkene diaphragm substrate list
Face or double-faced sputter have ceramic layer；The ceramic layer is Al2O3、TiO2、SiO2And ZrO2In one kind, one side thickness be 10~
500nm。
7. a kind of extended-life lithium ion battery according to claim 1, it is characterised in that：The lithium salts is selected from LiClO4、
LiCFSO3、LiPF6、LiBF4、LiAsF6, LiBOB, LiODFB and LiN (CF3SO3)2In one or more, concentration be 1~
2M。
8. a kind of extended-life lithium ion battery according to claim 1, it is characterised in that：The organic solvent is selected from carbonic acid
Vinyl acetate EC, propene carbonate PC, dimethyl carbonate DMC, diethyl carbonate DEC, methyl ethyl carbonate EMC and vinylene carbonate
One or more in VC.
9. a kind of extended-life lithium ion battery according to claim 1, it is characterised in that：The addition of the additive is
The 0.001~10% of electrolyte quality.
10. a kind of preparation method of extended-life lithium ion battery as claimed in claim 1, including：
(1) anode pole piece, cathode pole piece and barrier film are fabricated to lithium ion battery cell, shell in the form of winding or lamination
Using plastic-aluminum packaging film or box hat；
(2) battery core made from step (1) is placed in vacuum drying oven and dried, arrange parameter：80~100 DEG C of temperature, vacuum is
≤ -80Kpa, the time is 8~24h, and an argon gas is during which replaced per 2h；
(3) after battery core is cooled to room temperature, electrolyte is injected, electrolyte content is 1.6~5g/Ah, and long-life lithium is produced after sealing
Ion battery.
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| CN108493453A (en) * | 2018-04-16 | 2018-09-04 | 桑顿新能源科技有限公司 | A kind of high-energy density LiFePO4 system soft-package battery and preparation method thereof |
| CN110660960A (en) * | 2018-06-29 | 2020-01-07 | 宁德时代新能源科技股份有限公司 | Battery and preparation method thereof |
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Application publication date: 20170929 |