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Formation method of power lithium ion battery

A lithium-ion battery, a technology of a chemical formation method, which is applied in the field of chemical formation containing a composite positive active material, can solve the problem of high working voltage, and achieve the effects of avoiding voltage polarization, improving performance stability, and speeding up the formation time.

Active Publication Date: 2020-05-08
萧县鑫辉源电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the power requirements of electric vehicles and high-power electrical devices, lithium-ion batteries with composite positive electrodes have emerged as the times require. Lithium-ion batteries with composite positive electrodes have high energy density, good rate performance, high working voltage, and low cost. Favored by manufacturers, but for different composite positive electrodes, their physical and chemical properties are completely different, so the general chemical formation method is not suitable for the improvement of each composite electrode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]1) injecting the first electrolyte solution into the assembled battery, the volume injected by the first electrolyte solution is 50% of the total volume of the electrolyte solution;

[0030] 2) Stand still for 1 hour, charge the battery with a constant current to the first predetermined voltage at a rate of 0.02C, and then charge the battery at a constant voltage at the first predetermined voltage until the charging current is lower than 0.01C, and the first predetermined voltage is 3.1V;

[0031] 3) Inject the second electrolyte as the remaining electrolyte, and add 10% volume FEC on the basis of the first electrolyte;

[0032] 4) Adjust the temperature of the battery to 10 degrees Celsius;

[0033] 5) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0034] 6) Charge the battery with a constant current to a second predetermined voltage at a rate of 0.02C, the second predetermined voltage is 3.50V, adjust t...

Embodiment 2

[0039] 1) injecting the first electrolyte solution into the assembled battery, the volume injected by the first electrolyte solution is 60% of the total volume of the electrolyte solution;

[0040] 2) Stand still for 1 hour, charge the battery with a constant current to the first predetermined voltage at a rate of 0.05C, and then charge the battery at a constant voltage at the first predetermined voltage until the charging current is lower than 0.01C, and the first predetermined voltage is 3.2V;

[0041] 3) Inject the second electrolyte solution as the remaining electrolyte solution, and add 15% volume FEC on the basis of the first electrolyte solution as the second electrolyte solution;

[0042] 4) adjust the temperature of the battery to 6 degrees Celsius;

[0043] 5) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0044] 6) Charge the battery with a constant current to a second predetermined voltage at a rate...

Embodiment 3

[0049] 1) injecting the first electrolyte solution into the assembled battery, the volume injected by the first electrolyte solution is 55% of the total volume of the electrolyte solution;

[0050] 2) Stand still for 1h, charge the battery with a constant current to the first predetermined voltage at a rate of 0.04C, and then charge the battery with a constant voltage at the first predetermined voltage until the charging current is lower than 0.01C, and the first predetermined voltage is 3.15V;

[0051] 3) Inject the second electrolyte solution as the remaining electrolyte solution, and add 12% volume FEC on the basis of the first electrolyte solution as the second electrolyte solution;

[0052] 4) Adjust the temperature of the battery to 8 degrees Celsius;

[0053] 5) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0054] 6) Charge the battery with a constant current to a second predetermined voltage at a rate ...

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Abstract

The invention provides a formation method of a power lithium ion battery. The power lithium ion battery comprises a positive electrode, a separator between the positive electrode and the negative electrode; the positive electrode is a composite positive electrode formed by mixing a plurality of active substances; wherein the plurality of active substances comprise LiNi0.15Mn0.65Co0.15Mg0.03Al0.02O2, Li0.95Na0.05Mn2 and LiMn0.75Co0.2Mg0.03Al0.02O2; wherein the mass ratio of the LiNi0.15Mn0.65Co0.15Mg0.03Al0.02O2 to the Li0.95Na0.05Mn2 to the LiMn0.75Co0.2Mg0.03Al0.02O2 is 33: 42: 35-26: 60: 14.The formation method comprises the following steps: injecting a first electrolyte into an assembled battery, and carrying out pre-formation under a first predetermined voltage; injecting a second electrolyte of which the additive is FEC, and formally forming at a voltage higher than a first preset voltage. According to the formation method, the rate capability of the battery can be improved and the cycle life of the battery can be prolonged by a formation mode set for a specific active substance.

Description

technical field [0001] The invention relates to a method for forming a power lithium ion battery, in particular to a method for forming a composite positive electrode active material. Background technique [0002] The power lithium battery industry has entered a critical stage of industrialization construction and promotion and application. The industrialization process of power lithium batteries is already in an international leading position. In order to meet the power requirements of electric vehicles and high-power electrical devices, lithium-ion batteries with composite positive electrodes have emerged as the times require. Lithium-ion batteries with composite positive electrodes have high energy density, good rate performance, high working voltage, and low cost. It is favored by manufacturers, but for different composite positive electrodes, their physical and chemical properties are completely different. Therefore, the general chemical formation method is not suitabl...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0567
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 金妍
Owner 萧县鑫辉源电池有限公司
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