CN103633284B - Lithium ion battery liquid injection method - Google Patents
Lithium ion battery liquid injection method Download PDFInfo
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- CN103633284B CN103633284B CN201310667120.2A CN201310667120A CN103633284B CN 103633284 B CN103633284 B CN 103633284B CN 201310667120 A CN201310667120 A CN 201310667120A CN 103633284 B CN103633284 B CN 103633284B
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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
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
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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
Abstract
The present invention relates to the manufacturing technology of lithium ion battery, specifically a kind of electrolyte filling method of lithium ion battery.The method comprises the following steps: step one, first time fluid injection, the electrolyte A containing vinylene carbonate is injected the lithium rechargeable battery treating fluid injection; Reservoir quantity is 30 ~ 45% of total fluid injection quality; Step 2, changes into; Step 3, second time fluid injection, injected by the electrolyte B containing vinylene carbonate, reservoir quantity is 25% ~ 35% of total fluid injection quality; Step 4, changes into; Step 5, third time fluid injection, injected by the electrolyte C containing vinylene carbonate, reservoir quantity is 15% ~ 25% of total fluid injection quality; Step 6, changes into; Step 7, the 4th fluid injection, injects electrolyte D, and reservoir quantity is 10% ~ 20% of total fluid injection quality; Step 8, ageing, after ageing, secondary encapsulation obtains lithium ion battery.The present invention impels battery to form stable fine and close SEI film, effectively can improve charging times and the useful life of battery.
Description
Technical field
The present invention relates to the manufacturing technology of lithium ion battery, specifically a kind of electrolyte filling method of lithium ion battery.
Background technology
Lithium ion battery has relative to lead-acid battery, Ni-MH battery, nickel-cadmium cell that higher energy density, self discharge are little, the advantage such as have extended cycle life, and is currently widely used in consumer electronics field.
Electrolyte is the important component part of lithium ion battery.It is the carrier that transmits between both positive and negative polarity of lithium ion and medium, also provides lithium ion simultaneously.The conductivity of electrolyte is one of important parameter of electrolyte, has important impact to the performance such as performance, multiplying power of electrode active material specific capacity.
Current conventional lithium-ion battery electrolytes uses LiPF6 to be solute, the ester classes such as ethylene carbonate (EC), propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC) are main solvent, then add corresponding additive.
In lithium ion battery first charge-discharge process, electrode material and electrolyte react on solid-liquid phase interface, form one deck solid dielectric film (SEI film).SEI film is electronic body, is but the excellence conductor of Li+.On the one hand, the formation of SEI film, consumes part lithium ion, first charge-discharge irreversible capacity is increased, reduces the first charge-discharge efficiency of electrode material.And produce gas in the process, harmful effect is caused to battery core performance.
Present stage generally believes negative terminal surface SEI film to the impact of performance of lithium ion battery much larger than positive electrode surface SEI film.The compatibility of electrolyte and negative pole graphite material is determined by the SEI film properties formed to a great extent.Lithium ion battery forms fine and close SEI film in the stage of changing into, if the SEI film formed is fine and close and complete not, may affect charge-discharge performance and the cycle performance of battery.In organic electrolyte, the most easily there is Double electron reduction reaction in vinylene carbonate (VC), impels effectively forming SEI film as additive VC.In view of this, necessaryly provide a kind of fluid injection chemical synthesizing method that can form high-quality SEI film, the safety and stability performance improving battery ensures that battery has good high-temperature behavior and cryogenic property simultaneously.
Summary of the invention
Technical problem to be solved by this invention is, lithium ion cell electrode forms SEI film to provide one to promote, improves the electrolyte filling method of the lithium ion battery of battery charging and discharging performance and cycle performance.
The electrolyte filling method of lithium ion battery of the present invention comprises the following steps:
Step one, first time fluid injection, injects the lithium rechargeable battery treating fluid injection by the electrolyte A containing vinylene carbonate (VC); After fluid injection, the time of shelving is 12 ~ 24 hours to battery at normal temperatures, and pole piece and barrier film are fully infiltrated; Reservoir quantity is 30 ~ 45% of total fluid injection quality; In electrolyte A, VC mass content is 8% ~ 20%, and lithium salt is 0.5 ~ 2.0mol/L;
Step 2, changes into, and carries out ageing, change into after sealing and standing the battery that step one obtains, and 0.02C constant current charge is to 3.2V, and the time of shelving is 8 ~ 12h;
Step 3, second time fluid injection, will inject containing the electrolyte B of vinylene carbonate (VC), after fluid injection, the time of shelving is 12 ~ 24 hours to battery at normal temperatures, and reservoir quantity is 25% ~ 35% of total fluid injection quality; In electrolyte B, VC mass content is 4% ~ 10%, and lithium salt is 0.5 ~ 2.0mol/L;
Step 4, changes into, and changes into the battery that step 3 obtains, and 0.05C constant current charge, to 3.4V, shelves time 8 ~ 12h;
Step 5, third time fluid injection, injected by the electrolyte C containing vinylene carbonate (VC), after fluid injection, the time of shelving is 12 ~ 24 hours to battery at normal temperatures, and reservoir quantity is 15% ~ 25% of total fluid injection quality; In electrolyte C, VC mass content is 1% ~ 5%, and lithium salt is 0.5 ~ 2.0mol/L;
Step 6, changes into, and changes into the battery that step 5 obtains, and with 0.1C constant current charge to 3.45V, the time of shelving is 8 ~ 12h;
Step 7, the 4th fluid injection, injects electrolyte D, and after fluid injection, the time of shelving is 12 ~ 24 hours to battery at normal temperatures, and reservoir quantity is 10% ~ 20% of total fluid injection quality; In electrolyte D, lithium salt is 0.5 ~ 2.0mol/L;
Step 8, ageing, to the Battery formation obtained in step 7, with 0.2C constant current charge to 3.65V, shelves time 12 ~ 24h, extracts unnecessary electrolyte out and the laggard row secondary encapsulation of gas obtains lithium ion battery after ageing.
Described electrolyte A-D mixes obtained by solute lithium salts and organic solvent, and described lithium salts is LiPF6 or LiBF4, the Conventional solvents that described solvent uses for this area lithium secondary cell electrolyte.Described solvent includes but not limited to ionic liquid, sulfone compound, cyanides, carbonic ester, sulfite, ether, acetonitrile, lactams or ketone etc., and described solvent is that one is used alone or more than one are used in combination.
The invention has the beneficial effects as follows: by substep fluid injection with change into, and the fluid injection of each step of choose reasonable and change into parameter, impel battery to form stable fine and close SEI film, effectively can improve charging times and the useful life of battery, promote the fail safe of battery.
Embodiment
Below in conjunction with comparative example and embodiments of the invention, the embodiment of the inventive method and implementation result are described further.
Comparative example 1:
Step one, by containing vinylene carbonate (VC) and electrolyte A inject and treat the lithium rechargeable battery of fluid injection.After fluid injection, the time of shelving is 10h to battery at normal temperatures, and pole piece and barrier film are fully infiltrated.In electrolyte A, VC mass content is 8%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1mol/L;
Step 2, ageing, to the Battery formation obtained in step one, shelves, and extracts unnecessary electrolyte out and the laggard row secondary encapsulation of gas obtains lithium ion battery after ageing.
Comparative example 2:
Step one, first time fluid injection: the electrolyte A containing vinylene carbonate (VC) is injected the lithium rechargeable battery treating fluid injection.After fluid injection, the time of shelving is 10h to battery at normal temperatures, and pole piece and barrier film are fully infiltrated.Reservoir quantity is 50% of total fluid injection weight, and in electrolyte A, VC mass content is 8%, and solvent is solvent be ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1mol/L;
Step 2, changes into: carry out ageing to the battery that step one obtains, and change into after rubberizing sealing is static, 0.02C constant current charge is to 3.2V, and the time of shelving is 10h;
Step 3, second time fluid injection: injected by electrolyte B, normal temperature shelf time 12h, reservoir quantity is 50% of total fluid injection weight.In electrolyte B, ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1.0mol/L;
Step 4, ageing: to the Battery formation obtained in step 3, extracts unnecessary electrolyte out after ageing and the laggard row secondary encapsulation of gas obtains lithium ion battery.
Comparative example 3:
Step one, first time fluid injection: the electrolyte A containing vinylene carbonate (VC) is injected the lithium rechargeable battery treating fluid injection, after fluid injection, the time of shelving is 10h to battery at normal temperatures, pole piece and barrier film are fully infiltrated, reservoir quantity is 40% of total fluid injection weight, and in electrolyte A, VC mass content is 8%, and ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are the mixed solvent of 1:1, lithium salts is LiPF6, and lithium salt is 1mol/L;
Step 2, changes into: carry out ageing to the battery that step one obtains, and change into after rubberizing sealing is static, 0.02C constant current charge is to 3.2V, and the time of shelving is 10h;
Step 3, second time fluid injection: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 40% of total fluid-injecting amount, in electrolyte B, VC mass content is 4%, ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L;
Step 4, changes into: change into the battery that step 3 obtains, and 0.05C constant current charge, to 3.4V, shelves time 10h;
Step 5, third time fluid injection: injected by electrolyte C, normal temperature shelf time 12h, injection rate is 20% of total implantation quality; In electrolyte C, ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 6, ageing: to the Battery formation obtained in step 5, extracts unnecessary electrolyte out after ageing and the laggard row secondary encapsulation of gas obtains lithium ion battery.
Embodiment 1:
Step one, first time fluid injection: the electrolyte A containing vinylene carbonate (VC) is injected the lithium rechargeable battery treating fluid injection.After fluid injection, the time of shelving is 10h to battery at normal temperatures, and pole piece and barrier film are fully infiltrated.Reservoir quantity is 30% of total fluid injection weight.In electrolyte A, VC mass content is 8%, and ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio are the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1mol/L.
Step 2, changes into: carry out ageing to the battery that step one obtains, and change into after rubberizing sealing is static, 0.02C constant current charge is to 3.2V, and the time of shelving is 10h.
Step 3, second time fluid injection: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 30% of total fluid injection quality, in electrolyte B, VC mass content is 4%, solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1.0mol/L.
Step 4, changes into: change into the battery that step 3 obtains, and 0.05C constant current charge, to 3.4V, shelves time 10h.
Step 5, electrolyte C containing vinylene carbonate (VC) injects by third time fluid injection, normal temperature shelf time 12h, wherein injection rate is 20% of total fluid injection quality, in electrolyte C, VC mass content is 1%, solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1.0mol/L.
Step 6, changes into, and changes into the battery that step 5 obtains, and with 0.1C constant current charge to 3.45V, the time of shelving is 10h.
Step 7,4th fluid injection: electrolyte D is injected, normal temperature shelf time 12h, injection rate is 20% of total implantation quality, in electrolyte D, solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, lithium salts is LiBF4, and lithium salt is 1.0mol/L.
Step 8, ageing, to the Battery formation obtained in step 7, with 0.2C constant current charge to 3.65V, shelves time 12h, extracts unnecessary electrolyte out and the laggard row secondary encapsulation of gas obtains lithium ion battery after ageing.
Embodiment 2:
Step one, first time fluid injection: the electrolyte A containing vinylene carbonate (VC) is injected the lithium rechargeable battery treating fluid injection.After fluid injection, the time of shelving is 10h to battery at normal temperatures, and pole piece and barrier film are fully infiltrated.Reservoir quantity is 35% of total fluid injection weight.In electrolyte A, VC mass content is 8%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1mol/L.
Step 2, changes into: carry out ageing to the battery that step one obtains, and change into after rubberizing sealing is static, 0.02C constant current charge is to 3.2V, and the time of shelving is 10h.
Step 3, second time fluid injection: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 25% of total fluid injection quality.In electrolyte B, VC mass content is 4%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1.0mol/L.
Step 4, changes into: change into the battery that step 3 obtains, and 0.05C constant current charge, to 3.4V, shelves time 10h.
Step 5, third time fluid injection: injected by the electrolyte C containing vinylene carbonate (VC), normal temperature shelf time 12h wherein injection rate is 25% of total fluid injection quality.In electrolyte C, VC mass content is 1%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1.0mol/L.
Step 6, changes into: change into the battery that step 5 obtains, and with 0.1C constant current charge to 3.45V, the time of shelving is 10h.
Step 7, the 4th fluid injection: injected by electrolyte D, normal temperature shelf time 12h, injection rate is 15% of total implantation quality.In electrolyte D, solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiBF4, and lithium salt is 1.0mol/L.
Step 8, ageing, to the Battery formation obtained in step 7, with 0.2C constant current charge to 3.65V, shelves time 12h, extracts unnecessary electrolyte out and the laggard row secondary encapsulation of gas obtains lithium ion battery after ageing.
Embodiment 3:
Step one, first time fluid injection: the electrolyte A containing vinylene carbonate (VC) is injected the lithium rechargeable battery treating fluid injection.After fluid injection, the time of shelving is 10h to battery at normal temperatures, and pole piece and barrier film are fully infiltrated.Reservoir quantity is 40% of total fluid injection weight.In electrolyte A, VC mass content is 8%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1mol/L.
Step 2, changes into: carry out ageing to the battery that step one obtains, and change into after rubberizing sealing is static, 0.02C constant current charge is to 3.2V, and the time of shelving is 10h.
Step 3, second time fluid injection: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 30% of total fluid injection quality.In electrolyte B, VC mass content is 4%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 4, changes into: change into the battery that step 3 obtains, and 0..05C constant current charge, to 3.4V, shelves time 10h.
Step 5, the electrolyte C containing vinylene carbonate (VC) injects by third time fluid injection, and normal temperature shelf time 12h wherein injection rate is 20% of total fluid injection quality.In electrolyte C, VC mass content is 1%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 6, changes into, and changes into the battery that step 5 obtains, and with 0.1C constant current charge to 3.45V, the time of shelving is 10h.
Step 7, the 4th fluid injection: injected by electrolyte D, normal temperature shelf time 12h, injection rate is 10% of total implantation quality.In electrolyte D, solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 8, ageing, to the Battery formation obtained in step 7, with 0.2C constant current charge to 3.65V, shelves time 12h, extracts unnecessary electrolyte out and the laggard row secondary encapsulation of gas obtains lithium ion battery after ageing.
Embodiment 4:
Step one, first time fluid injection: the electrolyte A containing vinylene carbonate (VC) is injected the lithium rechargeable battery treating fluid injection.After fluid injection, the time of shelving is 10h to battery at normal temperatures, and pole piece and barrier film are fully infiltrated.Reservoir quantity is 45% of total fluid injection weight.In electrolyte A, VC mass content is 8%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1mol/L.
Step 2, changes into: carry out ageing to the battery that step one obtains, and change into after rubberizing sealing is static, 0.02C constant current charge is to 3.2V, and the time of shelving is 10h.
Step 3, second time fluid injection: will inject containing the electrolyte B of vinylene carbonate (VC), normal temperature shelf time 12h, wherein reservoir quantity is 25% of total fluid injection quality.In electrolyte B, VC mass content is 4%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 4, changes into: change into the battery that step 3 obtains, and 0..05C constant current charge, to 3.4V, shelves time 10h.
Step 5, the electrolyte C containing vinylene carbonate (VC) injects by third time fluid injection, and normal temperature shelf time 12h wherein injection rate is 15% of total fluid injection quality.In electrolyte C, VC mass content is 1%, and solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 6, changes into, and changes into the battery that step 5 obtains, and with 0.1C constant current charge to 3.45V, the time of shelving is 10h.
Step 7, the 4th fluid injection: injected by electrolyte D, normal temperature shelf time 12h, injection rate is 15% of total implantation quality.In electrolyte D, solvent is ethylene carbonate (EC) and methyl ethyl carbonate (EMC) mass ratio is the mixed solvent of 1:1, and lithium salts is LiPF6, and lithium salt is 1.0mol/L.
Step 8, ageing, to the Battery formation obtained in step 7, with 0.2C constant current charge to 3.65V, shelves time 12h, extracts unnecessary electrolyte out and the laggard row secondary encapsulation of gas obtains lithium ion battery after ageing.
The battery of comparative example and the embodiment of the present invention makes: anode pole piece, Celgard2400 type polypropylene diaphragm and cathode pole piece are superimposed in order, and winding, loads in battery case after hot pressing.Battery cell is put in baking box, vacuum bakeout 24 hours at 80 DEG C, then battery cell is transferred between fluid injection, according to above-mentioned comparative example and the fluid injection of embodiment method.
Battery testing: by the battery cell prepared, changes into certain technique, and voltage range is 2.0 ~ 3.65V, the capacity of test battery monomer, the simultaneously high rate performance of test battery monomer and cycle performance, storge quality and security performance, constant current charge performance, testing impedance.Test battery is 40155 cylinder cells.
The battery performance test result that comparative example and embodiment obtain is as shown in the table.Data result is all average after taking test 5 times.
| Testing impedance Ω (m Ω) | 1C/1C 1000 capability retentions | 55 oC 500 capability retentions | Coulombic efficiency (%) first | |
| Comparative example 1 | 2.45 | 78.0 | 83.1 | 91.0 |
| Comparative example 2 | 2.12 | 82.0 | 85.0 | 91.2 |
| Comparative example 3 | 1.94 | 82.5 | 86.0 | 91.6 |
| Embodiment 1 | 1.11 | 92.4 | 93.9 | 98.7 |
| Embodiment 2 | 1.32 | 87.4 | 92.4 | 97.3 |
| Embodiment 3 | 1.23 | 86.8 | 92.2 | 96.8 |
| Embodiment 4 | 1.35 | 87.6 | 91.8 | 97.4 |
As can be seen from the table, adopt electrolyte filling method of the present invention, first coulombic efficiency, high temperature cyclic performance, normal-temperature circulating performance all has performance more better than comparative example.Also be not difficult to find out from testing impedance data, adopt electrolyte filling method of the present invention, battery cell has lower internal resistance.
Claims (2)
1. an electrolyte filling method for lithium ion battery, is characterized in that: comprise the following steps,
Step one, first time fluid injection, injects the lithium rechargeable battery treating fluid injection by the electrolyte A containing vinylene carbonate; After fluid injection, the time of shelving is 12 ~ 24 hours to battery at normal temperatures, and pole piece and barrier film are fully infiltrated; Reservoir quantity is 30 ~ 45% of total fluid injection quality; In electrolyte A, VC mass content is 8% ~ 20%, and lithium salt is 0.5 ~ 2.0mol/L;
Step 2, changes into, and carries out ageing, change into after sealing and standing the battery that step one obtains, and 0.02C constant current charge is to 3.2V, and the time of shelving is 8 ~ 12h;
Step 3, second time fluid injection, injected by the electrolyte B containing vinylene carbonate, after fluid injection, the time of shelving is 12 ~ 24 hours to battery at normal temperatures, and reservoir quantity is 25% ~ 35% of total fluid injection quality; In electrolyte B, VC mass content is 4% ~ 10%, and lithium salt is 0.5 ~ 2.0mol/L;
Step 4, changes into, and changes into the battery that step 3 obtains, and 0.05C constant current charge, to 3.4V, shelves time 8 ~ 12h;
Step 5, third time fluid injection, injected by the electrolyte C containing vinylene carbonate, after fluid injection, the time of shelving is 12 ~ 24 hours to battery at normal temperatures, and reservoir quantity is 15% ~ 25% of total fluid injection quality; In electrolyte C, VC mass content is 1% ~ 5%, and lithium salt is 0.5 ~ 2.0mol/L;
Step 6, changes into, and changes into the battery that step 5 obtains, and with 0.1C constant current charge to 3.45V, the time of shelving is 8 ~ 12h;
Step 7, the 4th fluid injection, will not inject containing vinylene carbonate electrolyte D, after fluid injection, the time of shelving is 12 ~ 24 hours to battery at normal temperatures, and reservoir quantity is 10% ~ 20% of total fluid injection quality; In electrolyte D, lithium salt is 0.5 ~ 2.0mol/L;
Step 8, ageing, to the Battery formation obtained in step 7, with 0.2C constant current charge to 3.65V, shelves time 12 ~ 24h, extracts unnecessary electrolyte out and the laggard row secondary encapsulation of gas obtains lithium ion battery after ageing.
2. the electrolyte filling method of lithium ion battery according to claim 1, it is characterized in that: electrolyte A-D mixes obtained by solute lithium salts and organic solvent, described lithium salts is LiPF6 or LiBF4, the Conventional solvents that described solvent uses for lithium secondary cell electrolyte.
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| CN109065826A (en) * | 2018-07-06 | 2018-12-21 | 合肥国轩高科动力能源有限公司 | A kind of wetting method of high capacity high-pressure solid negative electrode lithium ion battery |
| CN109273663A (en) * | 2018-11-21 | 2019-01-25 | 惠州亿纬锂能股份有限公司 | A kind of battery electrolyte injection method |
| CN109638366A (en) * | 2018-11-23 | 2019-04-16 | 天津市捷威动力工业有限公司 | A kind of lithium ion battery benefit lithium method |
| CN109728239B (en) * | 2019-01-07 | 2022-07-12 | 惠州亿纬锂能股份有限公司 | Liquid injection method of battery and lithium ion battery prepared by same |
| CN111384450B (en) * | 2020-03-20 | 2021-05-11 | 广州明美新能源股份有限公司 | Liquid injection formation method of lithium ion battery |
| CN111916841A (en) * | 2020-09-24 | 2020-11-10 | 昆山宝创新能源科技有限公司 | Method for improving electrolyte infiltration effect of lithium battery and reducing diaphragm wrinkles and lithium battery |
| CN112151871A (en) * | 2020-09-28 | 2020-12-29 | 苏州酷卡环保科技有限公司 | Formation method of high-temperature lithium ion battery |
| CN113394523B (en) * | 2021-05-21 | 2022-09-20 | 天能电池集团股份有限公司 | Acid adding and formation method for lead storage battery |
| CN113629365B (en) * | 2021-08-24 | 2023-05-23 | 蜂巢能源科技有限公司 | Electrolyte injection method and lithium ion battery |
| CN113904071B (en) * | 2021-09-28 | 2023-05-26 | 蜂巢能源科技有限公司 | Secondary liquid injection method and application thereof |
| CN113937366B (en) * | 2021-10-11 | 2023-11-03 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Method for shortening activation time of lithium storage battery and application |
| CN114204130B (en) * | 2021-12-08 | 2023-05-05 | 湖北亿纬动力有限公司 | Lithium ion battery and formation method and application thereof |
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