CN111276758B - Preparation method of lithium ion battery - Google Patents

Preparation method of lithium ion battery Download PDF

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CN111276758B
CN111276758B CN202010107697.8A CN202010107697A CN111276758B CN 111276758 B CN111276758 B CN 111276758B CN 202010107697 A CN202010107697 A CN 202010107697A CN 111276758 B CN111276758 B CN 111276758B
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ion battery
lithium ion
ddb
bte
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CN111276758A (en
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曾金辉
方智裔
陆晨杰
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Jiangxi DBK Corporation Co.,Ltd.
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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
    • 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
    • H01M10/05—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
    • H01M10/056—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
    • H01M10/0569—Liquid materials characterised by the solvents
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • 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
    • H01M2004/028—Positive electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Abstract

The invention provides a preparation method of a lithium ion battery, wherein a positive active material of the lithium ion battery is lithium iron phosphate or modified lithium iron phosphate, an electrolyte of the lithium ion battery comprises a lithium salt, an organic solvent containing Propylene Carbonate (PC) and an additive, and the additive comprises a combination of 1, 2-trifluoroacetoxyethane (BTE), 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) and tris- (2,2, 2-trifluoroethyl) phosphite (TTFP). The preparation method comprises the steps of injecting a first electrolyte into a battery shell for pre-formation, injecting a second electrolyte into the first electrolyte, and performing secondary formation, wherein the additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the second electrolyte comprises 1, 2-trifluoroacetoxyethane (BTE) and 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB). The lithium ion battery obtained by the preparation method has a wide working temperature window, and particularly has excellent performance at high temperature.

Description

Preparation method of lithium ion battery
Technical Field
The invention relates to a preparation method of a lithium ion battery, in particular to a preparation method of a lithium iron phosphate lithium ion battery.
Background
The lithium iron phosphate battery has the advantages of high working voltage, high energy density, long cycle life, good safety performance, small self-discharge rate and no memory effect. With the increasing energy crisis and environmental problems, lithium iron phosphate batteries have gained rapid development in recent 10 years as novel efficient green energy sources, and are widely used in electronic products, electric vehicles, energy storage power supplies and other aspects. And the power lithium iron phosphate battery has the most vitality in the market of power batteries of new energy automobiles. In order to improve the application range of the lithium iron phosphate battery, the working window of the battery needs to be enlarged, especially the working performance in a high-temperature environment.
Disclosure of Invention
The invention provides a preparation method of a lithium ion battery, wherein a positive active material of the lithium ion battery is lithium iron phosphate or modified lithium iron phosphate, an electrolyte of the lithium ion battery comprises a lithium salt, an organic solvent containing Propylene Carbonate (PC) and an additive, and the additive comprises a combination of 1, 2-trifluoroacetoxyethane (BTE), 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) and tris- (2,2, 2-trifluoroethyl) phosphite (TTFP). The preparation method comprises the steps of injecting a first electrolyte into a battery shell for pre-formation, injecting a second electrolyte into the first electrolyte, and performing secondary formation, wherein the additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the second electrolyte comprises 1, 2-trifluoroacetoxyethane (BTE) and 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB). The lithium ion battery obtained by the preparation method has a wide working temperature window, and particularly has excellent performance at high temperature.
The specific scheme is as follows:
a preparation method of a lithium ion battery is characterized in that a positive active material of the lithium ion battery is lithium iron phosphate or modified lithium iron phosphate, an electrolyte of the lithium ion battery comprises a lithium salt, an organic solvent containing Propylene Carbonate (PC) and an additive, wherein the additive comprises a combination of 1, 2-trifluoroacetoxyethane (BTE), 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) and tris- (2,2, 2-trifluoroethyl) phosphite (TTFP); the preparation method comprises the following steps: injecting a first electrolyte into a battery shell for pre-formation, wherein the first electrolyte accounts for 65-70% of the total volume of the electrolyte, an additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the content of the tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) is 4.5-5.5%; and then injecting a second electrolyte comprising 1, 2-trifluoroacetylethane (BTE) and 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB), wherein the content of 1, 2-trifluoroacetylethane (BTE) is 3.2-3.6%, the content of 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) is 5.2-6.0%, and the volume ratio of 1, 2-trifluoroacetylethane (BTE) to 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) satisfies 1:1.6-1.8, wherein secondary formation is performed to obtain the lithium ion battery.
Further, the positiveThe polar active material is selected from the group consisting of LiFexM1-xPO4Wherein x is more than or equal to 0.9 and less than or equal to 1, and M is selected from one or more of Mn, Co, Ni, Al, Mg, Nb, Ti and Cu.
Further, the organic solvent of the electrolyte is selected from cyclic carbonate, chain carbonate, functional group-substituted cyclic carbonate or functional group-substituted chain carbonate.
Further, the organic solvent of the electrolyte includes EC, PC and DMC.
Further wherein the volume ratio of EC, PC and DMC is 2:1: 2.
Further, the preparation method comprises the following steps:
1) injecting a first electrolyte into the battery shell, wherein the first electrolyte accounts for 65-70% of the total volume of the electrolyte, the additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the content of the tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) is 4.5-5.5%;
2) charging to 3.15-3.20V by constant current;
3) charging at constant voltage of 3.15-3.20V until the charging current is lower than 0.01C;
4) performing constant current charge and discharge cycle for several times in the voltage range of 3.15-3.20V to 3.05-3.10V;
5) charging to 3.75-3.80V by constant current;
6) injecting a second electrolyte solution in which the content of 1, 2-trifluoroacetoxyethane (BTE) is 3.2 to 3.6%, the content of 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) is 5.2 to 6.0%, and the volume ratio of 1, 2-trifluoroacetoxyethane (BTE) to 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) satisfies 1:1.6 to 1.8;
7) vacuumizing and standing;
8) performing constant current charge and discharge cycle for several times in the voltage range of 3.75-3.80V to 4.05-4.10V;
9) charging at constant current to 4.20-4.25V, and charging at constant voltage of 4.20-4.25V until the charging current is less than 0.01C;
10) performing constant current charge and discharge cycle for several times in the voltage range of 4.20-4.25V to 2.70-2.75V;
11) vacuumizing and sealing to obtain the battery.
Further, a lithium ion battery, wherein a positive active material of the lithium ion battery is lithium iron phosphate or modified lithium iron phosphate, an electrolyte of the lithium ion battery comprises a lithium salt, an organic solvent containing Propylene Carbonate (PC), and an additive, and the additive comprises a combination of 1, 2-trifluoroacetoxyethane (BTE), 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) and tris- (2,2, 2-trifluoroethyl) phosphite (TTFP); the lithium ion battery is prepared by the preparation method.
The invention has the following beneficial effects:
1) researchers found that, for a lithium iron phosphate-based positive electrode material, an additive of a combination of 1, 2-trifluoroacetoxyethane (BTE), 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) and tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) can improve cycle performance of a battery at normal temperature and high temperature.
2) When the additive is a combination of 1, 2-trifluoroacetylethane (BTE), 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) and tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), the stability of the electrolyte at high temperature can be improved and the service life of the battery at high temperature can be prolonged when the organic solvent contains PC.
3) And further, when the pre-formation is carried out by adopting tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) as an additive, and then the secondary formation is carried out by adding 1, 2-trifluoroacetylethane (BTE) and 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB), a more stable SEI film can be formed.
4) Through numerous tests, the voltage interval of the pre-formation and the voltage interval of the secondary formation which are suitable for using the electrolyte are determined.
5) The content ratio of the 1, 2-trifluoroacetyl ethane (BTE) to the 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) is in a specific range, and the cycle performance of the battery can be effectively improved.
Detailed Description
The present invention will be described in more detail below with reference to specific examples, but the scope of the present invention is not limited to these examples.
The active material of the anode is provided as LiFe0.9Mn0.1PO4A material; the active material of the negative electrode is a natural graphite negative electrode; the conductive lithium salts of the first and second electrolytes are both LiPF of 1mol/L6The organic solvent is a mixed solvent of EC + PC + DMC in a volume ratio of 2:1: 2; the additive of the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the additive of the second electrolyte is 1, 2-trifluoroacetoxyethane (BTE) and 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB).
Example 1
1) Injecting a first electrolyte into the battery shell, wherein the first electrolyte accounts for 65% of the total volume of the electrolyte, the additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the content of the tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) is 5.5% by volume;
2) charging to 3.15V at 0.02C by constant current;
3) charging at a constant voltage of 3.15V until the charging current is lower than 0.01C;
4) performing constant current charge and discharge cycle at 0.02C in a voltage range of 3.15V to 3.05V for 5 times;
5) charging to 3.75V at 0.05C by constant current;
6) injecting a second electrolyte solution, wherein the content of 1, 2-trifluoroacetoxyethane (BTE) in the second electrolyte solution is 3.2 volume percent, and the content of 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) in the second electrolyte solution is 5.2 volume percent;
7) vacuumizing and standing for 1 h;
8) performing constant current charge-discharge cycle for 5 times in a voltage range of 3.75V to 4.05V;
9) charging to 4.20V at constant current, and charging at constant voltage of 4.20V until the charging current is less than 0.01C;
10) performing constant current charge and discharge cycle for 3 times in a voltage range of 4.20V to 2.70V;
11) vacuumizing and sealing to obtain the battery.
Example 2
1) Injecting a first electrolyte into the battery shell, wherein the first electrolyte accounts for 68% of the total volume of the electrolyte, the additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the content of the tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) is 5% by volume;
2) charging to 3.18V at 0.02C by constant current;
3) charging at a constant voltage of 3.18V until the charging current is lower than 0.01C;
4) performing constant current charge and discharge cycle at 0.02C in a voltage range of 3.158V to 3.08V for 5 times;
5) charging to 3.78V at 0.05C;
6) injecting a second electrolyte solution in which the content of 1, 2-trifluoroacetoxyethane (BTE) is 3.4 vol% and the content of 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) is 5.6 vol%;
7) vacuumizing and standing for 1 h;
8) performing constant current charge and discharge cycle for 5 times in a voltage range of 3.78V to 4.08V;
9) charging to 4.20V at constant current, and charging at constant voltage of 4.20V until the charging current is less than 0.01C;
10) performing constant current charge and discharge cycle for 3 times in a voltage range of 4.20V to 2.75V;
11) vacuumizing and sealing to obtain the battery.
Example 3
1) Injecting a first electrolyte into the battery shell, wherein the first electrolyte accounts for 70% of the total volume of the electrolyte, the additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the content of the tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) is 4.5% by volume;
2) charging to 3.20V at 0.02C by constant current;
3) charging at a constant voltage of 3.20V until the charging current is lower than 0.01C;
4) performing constant current charge and discharge cycle at 0.02C in a voltage range of 3.20V to 3.10V for 5 times;
5) charging to 3.80V at 0.05C by constant current;
6) injecting a second electrolyte solution, wherein the content of 1, 2-trifluoroacetoxyethane (BTE) in the second electrolyte solution is 3.6 volume percent, and the content of 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) in the second electrolyte solution is 6.0 volume percent;
7) vacuumizing and standing for 1 h;
8) performing constant current charge and discharge cycle for 5 times in a voltage range of 3.80V to 4.10V;
9) charging to 4.25V at constant current, and charging at constant voltage of 4.25V until the charging current is less than 0.01C;
10) performing constant current charge-discharge cycle for 3 times in a voltage range of 4.25V to 2.75V;
11) vacuumizing and sealing to obtain the battery.
Comparative example 1
The first and second electrolytes were mixed in a ratio of 7:3 and injected into the battery case at the same time in step 1, step 6 was omitted, and other process parameters were the same as in example 3.
Comparative example 2
The second electrolyte does not contain any additives and the other process parameters are the same as in example 3.
Comparative example 3
The first electrolyte does not contain any additives and the other process parameters are the same as in example 3.
Comparative example 4
The second electrolyte contained no 1, 2-trifluoroacetoxyethane (BTE), and the other process parameters were the same as in example 3.
Comparative example 5
The second electrolyte does not contain 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB), and other process parameters are the same as those in example 3.
Comparative example 6
The content of 1, 2-trifluoroacetoxyethane (BTE) in the second electrolyte solution was 3 vol%, and the content of 1, 4-di-t-butyl-2, 5-dimethoxybenzene (DDB) was 6.5 vol%; the other process parameters were the same as in example 3.
Experiment and data
The batteries respectively obtained according to the preparation methods of examples 1 to 3 and comparative examples 1 to 6 were subjected to capacity measurement, and then subjected to charge-discharge cycles at a rate of 1C at normal and high temperatures for 200 times to calculate capacity retention rates, and the results are shown in the following tables.
TABLE 1
25℃(％) 45℃(％)
Example 1 98.9 97.1
Example 2 99.3 97.4
Example 3 99.1 97.6
Comparative example 1 95.8 93.7
Comparative example 2 94.3 92.1
Comparative example 3 93.6 91.6
Comparative example 4 92.9 90.3
Comparative example 5 92.5 90.6
Comparative example 6 96.1 93.4
Therefore, the selection and the proportion of the three additives have obvious effect of improving the high-temperature performance; and the formation process can further promote the improvement of the cycle performance.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.

Claims (7)

1. A preparation method of a lithium ion battery is characterized in that a positive active material of the lithium ion battery is lithium iron phosphate or modified lithium iron phosphate, an electrolyte of the lithium ion battery comprises a lithium salt, an organic solvent containing Propylene Carbonate (PC) and an additive, wherein the additive comprises a combination of 1, 2-trifluoroacetoxyethane (BTE), 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) and tris- (2,2, 2-trifluoroethyl) phosphite (TTFP); the preparation method comprises the following steps: injecting a first electrolyte into a battery shell for pre-formation, wherein the first electrolyte accounts for 65-70% of the total volume of the electrolyte, an additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the content of the tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) in the first electrolyte is 4.5-5.5% by volume; and then injecting a second electrolyte, wherein the additives in the second electrolyte are 1, 2-trifluoroacetylethane (BTE) and 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB), the content of the 1, 2-trifluoroacetylethane (BTE) in the second electrolyte is 3.2-3.6% by volume, the content of the 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) in the second electrolyte is 5.2-6.0% by volume, and the volume ratio of the 1, 2-trifluoroacetylethane (BTE) to the 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) satisfies 1:1.6-1.8, wherein secondary formation is performed to obtain the lithium ion battery.
2. The method according to claim 1, wherein the positive active material is selected from the group consisting of LiFexM1-xPO4Wherein x is more than or equal to 0.9 and less than or equal to 1, and M is selected from one or more of Mn, Co, Ni, Al, Mg, Nb, Ti and Cu.
3. The method according to claim 1, wherein the organic solvent of the electrolyte is selected from the group consisting of cyclic carbonates and chain carbonates.
4. The method of claim 3, wherein the organic solvent of the electrolyte comprises EC, PC and DMC.
5. The process of claim 4, wherein the volume ratio of EC, PC and DMC is 2:1: 2.
6. The method of claim 1, wherein the method of making comprises:
1) injecting a first electrolyte into the battery shell, wherein the first electrolyte accounts for 65-70% of the total volume of the electrolyte, the additive in the first electrolyte is tris- (2,2, 2-trifluoroethyl) phosphite (TTFP), and the content of the tris- (2,2, 2-trifluoroethyl) phosphite (TTFP) in the first electrolyte is 4.5-5.5% by volume;
2) charging to 3.15-3.20V by constant current;
3) charging at constant voltage of 3.15-3.20V until the charging current is lower than 0.01C;
4) performing constant current charge and discharge cycle for several times in a voltage range from any voltage of 3.15-3.20V to any voltage of 3.05-3.10V;
5) charging to 3.75-3.80V by constant current;
6) injecting a second electrolyte solution in which the content of 1, 2-trifluoroacetoxyethane (BTE) is 3.2 to 3.6% by volume, the content of 1, 4-di-t-butyl-2, 5-dimethoxybenzene (DDB) is 5.2 to 6.0% by volume, and the volume ratio of 1, 2-trifluoroacetoxyethane (BTE) to 1, 4-di-t-butyl-2, 5-dimethoxybenzene (DDB) satisfies 1:1.6 to 1.8;
7) vacuumizing and standing;
8) performing constant current charge and discharge cycle for several times in a voltage range from any voltage of 3.75-3.80V to any voltage of 4.05-4.10V;
9) charging at constant current to 4.20-4.25V, and charging at constant voltage of 4.20-4.25V until the charging current is less than 0.01C;
10) performing constant current charge and discharge cycle for several times in a voltage range from any voltage of 4.20-4.25V to any voltage of 2.70-2.75V;
11) vacuumizing and sealing to obtain the battery.
7. A lithium ion battery, the positive pole active material of the lithium ion battery is lithium iron phosphate or modified lithium iron phosphate, the electrolyte of the lithium ion battery comprises lithium salt, organic solvent containing Propylene Carbonate (PC), and additive, the additive comprises the combination of 1, 2-trifluoroacetate ethane (BTE), 1, 4-di-tert-butyl-2, 5-dimethoxybenzene (DDB) and tris- (2,2, 2-trifluoroethyl) phosphite ester (TTFP); the lithium ion battery is prepared by the preparation method of any one of claims 1 to 6.
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