CN110233301B - Preparation method of lithium titanate battery - Google Patents

Preparation method of lithium titanate battery Download PDF

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CN110233301B
CN110233301B CN201910632847.4A CN201910632847A CN110233301B CN 110233301 B CN110233301 B CN 110233301B CN 201910632847 A CN201910632847 A CN 201910632847A CN 110233301 B CN110233301 B CN 110233301B
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battery
charging
constant current
lithium titanate
positive
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CN110233301A (en
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杨书廷
刘红涛
杨娟
董红玉
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Battery Research Institute Of Henan Co ltd
Henan Normal University
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Battery Research Institute Of Henan Co ltd
Henan Normal University
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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
    • H01M10/052—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
    • H01M10/058—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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/446—Initial charging measures
    • 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
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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Abstract

The invention discloses a preparation method of a lithium titanate battery, which comprises the following steps: manufacturing positive and negative pole pieces, manufacturing a battery core, injecting liquid and sealing, primary forming and secondary forming. The initial formation is carried out at 30-40 ℃ and 0.4-0.7Mpa according to the following steps: charging at constant current of 0.03-0.04C for 2h; charging at constant current of 0.05-0.06C for 2h; charging for 2h at constant current of 0.1-0.2C; charging to 3V at constant current and constant voltage of 0.25-0.33C, and cutting off current of 0.05C; aging at 30-40 deg.C for 24 hr. The secondary formation is carried out at 30-40 ℃ and 0.4-0.7Mpa according to the following steps: constant current is discharged to 1.3V at 0.5-1C; charging to 2.7V at constant current and constant pressure of 0.5-1C; 3) constant current is discharged to 1.3V at 0.5-1C; 4) charging at 0.5-1 deg.C for 20 min; and (5) performing air-extracting packaging and shaping. The lithium titanate battery prepared by the method has less ballooning and good cycle characteristics.

Description

Preparation method of lithium titanate battery
Technical Field
The invention relates to a preparation method of a lithium ion battery, in particular to a preparation method of a lithium titanate battery.
Background
Negative electrodes currently used in commercial lithium ion batteries are carbon materials including hard carbon, soft carbon, natural graphite, artificial graphite, and the like. The relative potential of the graphite material and lithium is about 0.15V, and after the graphite material is contacted with an organic electrolyte, a solid electrolyte membrane is generated in the first formation process, so that a large amount of lithium ions are consumed. During high-rate charge and discharge, the graphite undergoes 6-8% volume expansion, so that the solid electrolyte membrane formed by formation is broken, and needs to be formed again, so that the battery capacity is rapidly attenuated. The relative potential of the lithium titanate material and lithium is about 1.55V, and a solid electrolyte membrane can not be formed in an organic solvent, so that the loss of lithium ions is reduced. The lithium titanate material is a composite oxide of lithium and transition metal titanium, has small volume change in the charging and discharging process, and can be basically called as a zero-strain material, so that the lithium titanate material has good cycle characteristics. The mobility of lithium ions in a graphite material is low, and a large polarization phenomenon exists in a high-rate charging and discharging process, so that the charging and discharging capacity of the battery is attenuated, and lithium precipitation also exists at the same time, so that the safety of the battery is influenced. The lithium titanate material is of a spinel structure with a three-dimensional diffusion channel, the diffusion coefficient of the lithium titanate material is much higher than that of graphite, and the polarization phenomenon in a high-rate charge and discharge process can be reduced. Therefore, the lithium titanate material can keep better cycle characteristics in large-rate charge and discharge.
Due to the special structure of the surface of lithium titanate, moisture is easily introduced in the preparation process of the battery taking lithium titanate as a negative electrode material, and the moisture decomposition and the catalytic decomposition reaction of an organic solvent in an electrolyte are easily generated on the surface of an electrode to generate gas, so that the battery generates gas expansion in the circulation process, and the circulation performance of the battery is seriously influenced.
Disclosure of Invention
The invention aims to provide a preparation method of a lithium titanate battery, and the battery prepared by the method effectively reduces ballooning of the lithium titanate battery in the recycling process and can keep better cycle characteristics in high-rate charge and discharge.
The technical scheme of the invention is as follows: a preparation method of a lithium titanate battery comprises the following steps:
a) manufacturing a positive plate and a negative plate: manufacturing a positive pole piece by using a positive active substance; manufacturing a negative pole piece by taking lithium titanate as a negative active substance;
b) manufacturing an electric core: drying and cutting the positive and negative pole pieces, manufacturing a laminated battery cell according to the sequence of the negative pole, the diaphragm and the positive pole, welding positive and negative pole lugs, and putting the battery cell into an aluminum plastic film packaging bag;
c) injecting liquid and sealing: when the total moisture of the anode, the cathode and the diaphragm of the battery core is controlled below 200ppm, injecting electrolyte into the battery core, sealing, and standing for 24 hours at the temperature of 30-40 ℃ to obtain a battery;
d) primary formation: the prepared battery is formed by the following steps at the temperature of 30-40 ℃ and the pressure of 0.4-0.7 Mpa:
1) charging for 2h at a constant current of 0.03-0.04C;
2) charging for 2h at a constant current of 0.05-0.06C;
3) charging for 2h at a constant current of 0.1-0.2C;
4) charging to 3V at constant current and constant voltage of 0.25-0.33C, and stopping current at 0.05C;
e) aging: aging the battery for 24 hours at the temperature of 30-40 ℃;
f) carrying out secondary formation: the battery is formed by the following steps of performing secondary step-by-step formation at the temperature of 30-40 ℃ and the pressure of 0.4-0.7 Mpa:
1) discharging to 1.3V at constant current of 0.5-1C;
2) charging to 2.7V at constant current and constant voltage of 0.5-1C;
3) discharging to 1.3V at constant current of 0.5-1C;
4) charging at 0.5C-1C for 20 min;
g) pumping, sealing, and shaping.
Preferably, the positive electrode active material in the step a) is LiNi0.5Co0.3Mn0.2O2、LiNi0.6Co0.2Mn0.2O2One kind of (1).
The invention has the beneficial effects that:
the invention reduces the occurrence of side reactions in the battery by controlling the moisture in the manufacturing process of the battery. In addition, the invention adopts a method of twice step formation, and the twice formation is carried out at the temperature of 30-40 ℃ and under the pressure of 0.4-0.7 Mpa. The temperature of 30-40 ℃ can simulate the temperature of the battery during use, and the higher temperature is favorable for accelerating the reaction of residual moisture in the battery and consuming the moisture in advance. In addition, the initialization adopts the step-increasing small-current charging, so that the occurrence of side reactions can be inhibited to the greatest extent, the generation reaction of the interface film on the electrode is slower, the interface film is more stable and compact, the damage and the regeneration of the interface film in the subsequent charging and discharging are avoided, and the cycle performance of the battery is better. In the secondary formation, charge and discharge are performed by controlling the voltage, so that the moisture remaining in the battery is further reacted and consumed. In the two formation processes, the battery is extruded under the pressure of 0.4-0.7Mpa, so that the gas generated in the formation process is easier to discharge. After the high-temperature pressurization is carried out for two times, the battery is subjected to air exhaust packaging, so that water in the production process of the battery is completely consumed by reaction as much as possible, and generated gas is removed in the final air exhaust process. Therefore, the lithium titanate battery prepared by the preparation method effectively reduces flatulence in the use process and has a better capacity retention rate.
Drawings
Fig. 1 is a 5C charge-discharge cycle curve in example 1.
Fig. 2 is a 5C charge-discharge cycle curve in example 2.
Fig. 3 is a 5C charge-discharge cycle curve in example 3.
Fig. 4 is a 5C charge-discharge cycle curve in example 4.
Detailed Description
The present invention will be described in detail with reference to examples. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. In addition, the following are only some embodiments of the present invention, not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
Preparation of lithium titanate battery
1) And (3) pulping by using a positive electrode: adding a composite conductive agent consisting of 1 part by mass of carbon nano tubes and 2 parts by mass of superconducting carbon black into N-methylpyrrolidone glue solution of 8% of partial polytetrafluoroethylene, wherein the use amount of the glue solution is 2 parts by mass of the partial polytetrafluoroethylene, and uniformly stirring to obtain slurry. 95 parts by mass of LiNi as a positive electrode material0.5Co0.3Mn0.2O2Adding into the slurry, and mixing uniformly to obtain the product with the viscosity of 6000-7000 MPa.SThe positive electrode slurry was filtered through a 200-mesh screen.
2) Pulping at the negative electrode:
adding a composite conductive agent consisting of 1 part by mass of carbon nano tubes and 2 parts by mass of superconducting carbon black into N-methylpyrrolidone glue solution of 8% of polytetrafluoroethylene with solid content, wherein the glue solution is used in an amount of 5 parts by mass of the polytetrafluoroethylene, and uniformly stirring to obtain slurry. 92 parts by mass of lithium titanate is added into the slurry and uniformly mixed to obtain negative electrode slurry with the viscosity of 6000-7000 MPa.S, and the negative electrode slurry is filtered by a 200-mesh screen.
3) Preparing a pole piece: the prepared and evenly mixed anode slurry and cathode slurry are respectively coated on a 14 mu m carbon-coated aluminum foil, and the carbon-coated component is superconducting carbon black. Preparing positive and negative pole pieces according to the theoretical value of the capacity of the positive pole piece per unit area/the capacity of the negative pole piece per unit area of 107 percent, and then rolling the positive pole pieces to obtain the positive pole piece with the compaction density of 3.2Kg/m3The compaction density of the negative pole piece is 2.1 Kg/m3And cutting and punching.
4) Baking the pole piece: and cutting the obtained positive and negative electrode plates, baking for 24 hours at 80 ℃ in a vacuum state, and replacing nitrogen every 2 hours. The moisture of the pole piece is controlled below 200 ppm.
5) Preparing an electric core: and preparing the prepared pole piece into a laminated battery cell on a laminating machine according to the sequence of a negative electrode, a diaphragm and a positive electrode, wherein the diaphragm adopts a wet-process PE diaphragm. And welding positive and negative electrode lugs. And putting the battery cell into an aluminum plastic film packaging bag.
6) Injecting liquid and sealing: and when the total moisture of the anode, the cathode and the diaphragm of the battery core is controlled to be below 200ppm, injecting the electrolyte into the battery core, sealing the air bag of the aluminum-plastic packaging bag, and standing for 24 hours at 40 ℃ to obtain the battery. Wherein the solvent in the electrolyte is ethylene carbonate and methyl ethyl carbonate, and the mass ratio of the ethylene carbonate to the methyl ethyl carbonate is 1: 1; LiPF with lithium salt of 1mol/L6Wherein the additive is vinylene carbonate, and the mass fraction of the vinylene carbonate is 1.5%.
7) Primary formation: the formation of the battery adopts closed formation, the formation temperature is 30 ℃, the pressure applied by the battery during the formation is 0.7MPa, and the formation comprises the following steps:
1) charging for 2h at a constant current of 0.03C;
2) charging at 0.05C for 2h;
3) charging for 2h at a constant current of 0.1C;
4) charging to 3V with 0.25C constant current and constant voltage, and cut-off current is 0.05C.
8) Aging: the cell was aged at 30 ℃ for 24 hours.
9) Carrying out secondary formation: the formation temperature is 30 ℃, the battery applied pressure during formation is 0.6MPa, and the formation is carried out according to the following steps:
1) discharging to 1.3V at constant current of 0.5C;
2) charging to 2.7V at constant current and constant voltage of 0.5C;
3) discharging to 1.3V at constant current of 0.5C;
4) charging at 0.5C for 20 min;
10) and (5) performing air-extracting packaging and shaping.
Second, testing of electrical properties
1. The battery prepared above was subjected to a battery double charge performance test, and the test conditions and results are shown in table 1.
The test results show that the lithium titanate battery prepared in the embodiment is charged by 1C, 2C, 3C, 4C and 5C respectively, and discharged by 1C, the capacity retention rate is greater than 98.0% after 1400 cycles, and the cycle performance is good; and no obvious flatulence phenomenon is found in the charging and discharging processes.
2. The battery prepared above was subjected to a battery power performance test, and the test conditions and results are shown in table 2.
The test result shows that the lithium titanate battery prepared by the embodiment is charged at 1C and discharged at 1C, 2C, 3C, 4C and 5C respectively, the capacity protection rate is more than 95.0% after 1400 cycles, and the cycle performance is good; and no obvious flatulence phenomenon is found in the charging and discharging processes.
3. The battery manufactured above was subjected to a 5C charge-discharge performance test, and the test curve is shown in fig. 1. As can be seen from the curve of fig. 1, the discharge curve of the battery 5C manufactured in this example is relatively stable without significant attenuation after 1400 cycles. And no significant flatulence was found during the test.
Therefore, the battery manufactured by the method in the embodiment can effectively reduce the ballooning in the charging and discharging process, and has better capacity retention rate and good cycle performance.
TABLE 1
Multiplying power of charging Discharge rate Capacity retention rate after 1400 cycles
1C 1C 100%
2C 1C 100%
3C 1C 99%
4C 1C 98.5%
5C 1C 98.5%
TABLE 2
Multiplying power of charging Discharge rate Capacity retention rate after 1400 cycles
1C 1C 100%
1C 2C 100%
1C 3C 99%
1C 4C 98%
1C 5C 97%
Example 2
The cell was fabricated, injected, sealed, and left to stand at 30 ℃ for 24 hours in exactly the same manner as in example 1 to produce a battery. Then, the manufactured battery is subjected to primary formation, aging and secondary formation according to the following steps, and then is subjected to air exhaust packaging and shaping:
primary formation: the formation of the battery adopts closed formation, the formation temperature is 40 ℃, the pressure applied by the battery during the formation is 0.4MPa, and the formation comprises the following steps:
1) charging for 2h at a constant current of 0.04C;
2) charging for 2h at a constant current of 0.06C;
3) charging for 2h at a constant current of 0.2C;
4) charging to 3V at constant current and constant voltage of 0.33C, and cutting off current of 0.05C.
Aging: the cell was aged at 40 ℃ for 24 hours.
Carrying out secondary formation: the formation temperature is 40 ℃, the battery applied pressure during formation is 0.7MPa, and the formation is carried out according to the following steps:
1) discharging to 1.3V at a constant current of 1C;
2) charging to 2.7V at constant current and constant voltage of 1C;
3) discharging to 1.3V at a constant current of 1C;
4) charging at 1C for 20 min;
and (3) testing electrical properties:
1. the battery manufactured in this example was subjected to a battery double charge performance test and a battery double discharge performance test, and the test conditions and the test results are shown in table 3. The test results show that the lithium titanate battery prepared in the embodiment is charged by 1C, 2C, 3C, 4C and 5C respectively, and discharged by 1C, the capacity retention rate is more than 97.0% after 1400 cycles, and the cycle performance is good; and no obvious flatulence phenomenon is found in the charging and discharging processes.
2. The battery prepared above was subjected to a battery power performance test, and the test conditions and test results are shown in table 4. The test result shows that the lithium titanate battery prepared by the embodiment is charged at 1C and discharged at 1C, 2C, 3C, 4C and 5C respectively, the capacity protection rate is more than 97% after 1400 cycles, and the cycle performance is good; and no obvious flatulence phenomenon is found in the charging and discharging processes.
3. The battery fabricated in this example was subjected to a 5C charge/discharge performance test, the test curve of which is shown in fig. 2. As can be seen from the curve of fig. 2, the discharge curve of the battery 5C manufactured in this example is relatively stable without significant attenuation after 1400 cycles. And no significant flatulence was found during the test.
Therefore, the battery manufactured by the method in the embodiment can effectively reduce the ballooning in the charging and discharging process, and has better capacity retention rate and good cycle performance.
TABLE 3
Multiplying power of charging Discharge rate Ratio of discharge capacity to initial capacity
1C 1C 100%
2C 1C 100%
3C 1C 99%
4C 1C 99%
5C 1C 97.5%
TABLE 4
Multiplying power of charging Discharge rate Ratio of discharge capacity to initial capacity
1C 1C 100%
1C 2C 100%
1C 3C 98.4%
1C 4C 97%
1C 5C 97%
Example 3
With LiNi0.6Co0.2Mn0.2O2As a positive electrode material, a lithium titanate battery was produced in the same manner as in example 1 except that the same material as in example 1 was used, and then the electrical properties of the battery produced in this example were measured in the same manner as in example 1, and the test conditions and test results are shown in tables 5 and 6. The test results show that the lithium titanate battery prepared in the embodiment is charged by 1C, 2C, 3C, 4C and 5C respectively, and discharged by 1C, the capacity retention rate is more than 97.0% after 1400 cycles, and the cycle performance is good; and no obvious flatulence phenomenon is found in the charging and discharging process; the lithium titanate battery prepared by the embodiment is charged at 1C and discharged at 1C, 2C, 3C, 4C and 5C respectively, the capacity protection rate is more than 97% after 1400 cycles, and the cycle performance is good; and no obvious flatulence phenomenon is found in the charging and discharging processes.
The battery fabricated in this example was subjected to a 5C charge/discharge performance test, the test curve of which is shown in fig. 3. As can be seen from the curve of fig. 3, the discharge curve of the battery 5C manufactured in this example is relatively stable without significant attenuation after 1400 cycles. And no significant flatulence was found during the test.
Therefore, the battery manufactured by the method in the embodiment can effectively reduce the ballooning in the charging and discharging process, and has better capacity retention rate and good cycle performance.
TABLE 5
Multiplying power of charging Discharge rate Ratio of discharge capacity to initial capacity
1C 1C 100%
2C 1C 100%
3C 1C 99.8%
4C 1C 99.5%
5C 1C 97.5%
TABLE 6
Multiplying power of charging Discharge rate Ratio of discharge capacity to initial capacity
1C 1C 100%
1C 2C 100%
1C 3C 98.6%
1C 4C 98.5%
1C 5C 97.3%
Example 4
With LiNi0.6Co0.2Mn0.2O2When a lithium titanate battery was produced as a positive electrode material in the same manner as in example 2 except that the other materials were used in the same manner as in example 2, the lithium titanate battery produced in this example was subjected to electrical property tests in the same manner as in example 2, and the test conditions and test results are shown in tables 7 and 8. The test results show that the lithium titanate battery prepared in the embodiment is charged by 1C, 2C, 3C, 4C and 5C respectively, and discharged by 1C, the capacity retention rate is greater than 98.0% after 1400 cycles, and the cycle performance is good; and no obvious flatulence phenomenon is found in the charging and discharging process; the lithium titanate battery prepared by the embodiment is charged at 1C and discharged at 1C, 2C, 3C, 4C and 5C respectively, the capacity protection rate is still more than 97% after 1400 cycles, and the cycle performance is good; and no obvious flatulence phenomenon is found in the charging and discharging processes.
The battery manufactured in this example was subjected to a 5C charge/discharge performance test, and the test curve is shown in fig. 4. As can be seen from the curve of fig. 4, the discharge curve of the battery 5C manufactured in this example is relatively stable without significant attenuation after 1400 cycles. And no significant flatulence was found during the test.
Therefore, the battery manufactured by the method in the embodiment can effectively reduce the ballooning in the charging and discharging process, and has better capacity retention rate and good cycle performance.
TABLE 7
Multiplying power of charging Discharge rate Ratio of discharge capacity to initial capacity
1C 1C 100%
2C 1C 100%
3C 1C 98.8%
4C 1C 99.0%
5C 1C 98.5%
TABLE 8
Multiplying power of charging Discharge rate Ratio of discharge capacity to initial capacity
1C 1C 100%
1C 2C 99.7%
1C 3C 98.6%
1C 4C 97.8%
1C 5C 97.6%

Claims (2)

1. A preparation method of a lithium titanate battery is characterized by comprising the following steps:
a) manufacturing a positive plate and a negative plate: manufacturing a positive pole piece by using a positive active substance; manufacturing a negative pole piece by taking lithium titanate as a negative active substance;
b) manufacturing an electric core: drying and cutting the positive and negative pole pieces, preparing a laminated battery cell according to the sequence of the negative pole, the diaphragm and the positive pole, welding the lugs of the positive and negative poles, and packaging the battery cell into an aluminum-plastic film packaging bag;
c) injecting liquid and sealing: when the total moisture of the anode, the cathode and the diaphragm of the battery core is controlled below 200ppm, injecting electrolyte into the battery core, sealing, and standing for 24 hours at the temperature of 30-40 ℃ to obtain a battery;
d) primary formation: the prepared battery is formed by the following steps at the temperature of 30-40 ℃ and the pressure of 0.4-0.7 Mpa:
1) charging for 2h at a constant current of 0.03-0.04C;
2) charging for 2h at a constant current of 0.05-0.06C;
3) charging for 2h at a constant current of 0.1-0.2C;
4) charging to 3V at constant current and constant voltage of 0.25-0.33C, and stopping current at 0.05C;
e) aging: aging the battery at 30-40 deg.C for 24 hr;
f) carrying out secondary formation: the battery is subjected to secondary step formation at the temperature of 30-40 ℃ and the pressure of 0.4-0.7Mpa according to the following steps:
1) discharging to 1.3V at constant current of 0.5-1C;
2) charging to 2.7V at constant current and constant voltage of 0.5-1C;
3) discharging to 1.3V at constant current of 0.5-1C;
4) charging at 0.5C-1C for 20 min;
g) pumping, sealing, and shaping.
2. The method of preparing a lithium titanate battery according to claim 1, wherein the positive active material in the step a) is LiNi0.5Co0.3Mn0.2O2、LiNi0.6Co0.2Mn0.2O2One kind of (1).
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CN111313096A (en) * 2020-02-27 2020-06-19 四川国创成电池材料有限公司 Formation process of lithium titanate battery and lithium titanate battery
CN111653842B (en) * 2020-03-20 2021-08-13 万向一二三股份公司 Low-self-discharge-rate lithium ion battery formation method and ternary soft-package lithium ion battery
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