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Preparation method of lithium ion battery

A lithium-ion battery and battery technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of battery pack performance damage, low cost, single cell attenuation, etc. The effect of eliminating polarization

Active Publication Date: 2020-12-18
东莞市力格新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The ternary electrode material with high manganese content has lower cost and better safety performance. It is one of the preferred battery materials as a battery pack for lithium-ion batteries. However, due to the performance differences of the battery packs , will lead to the attenuation of the single cells in the battery pack and cause the performance of the battery pack to be damaged. Therefore, the present invention provides a method for preparing a lithium-ion battery. The lithium-ion battery prepared by the method of the present invention has good cycle retention performance And high rate cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Inject the assembled battery into the first electrolyte, which accounts for 78% of the total electrolyte volume, wherein the organic solvent is dimethyl carbonate and ethyl methyl carbonate with a volume ratio of 1:1:2 With a mixed solvent of ethylene carbonate, the electrolyte salt is lithium hexafluorophosphate of 1.2mol / L, and the first electrolyte contains sodium carbonate of 70ppm (mass);

[0040] 2) charging to a first predetermined voltage with a predetermined current constant current, and the first predetermined voltage is 3.4V;

[0041] 3) Lower the battery temperature to 3 degrees Celsius, charge at the first predetermined voltage for 10 minutes, and measure the charging current;

[0042] 4) If the charging current is higher than 0.01C, perform the pre-formation process first and then the formation process; if not, perform the formation process directly;

[0043] The pre-forming process includes:

[0044] 1) Constant current discharge to a second predeter...

Embodiment 2

[0061] 1) The assembled battery is injected into the first electrolyte, which accounts for 78-80% of the total electrolyte volume, wherein the organic solvent is dimethyl carbonate and methyl carbonate with a volume ratio of 1:1:2 A mixed solvent of ethyl ester and ethylene carbonate, the electrolyte salt is lithium hexafluorophosphate of 1.2mol / L, and the sodium carbonate containing 70ppm (mass) is contained in the first electrolyte;

[0062] 2) charging to a first predetermined voltage with a predetermined current constant current, and the first predetermined voltage is 3.4V;

[0063] 3) Lower the battery temperature to 3 degrees Celsius, charge at the first predetermined voltage for 10 minutes, and measure the charging current;

[0064] 4) If the charging current is higher than 0.01C, perform the pre-formation process first and then the formation process; if not, perform the formation process directly;

[0065] The pre-forming process includes:

[0066] 1) Constant curren...

Embodiment 3

[0083] 1) The assembled battery is injected into the first electrolyte, which accounts for 80% of the total electrolyte volume, and the organic solvent is dimethyl carbonate and ethyl methyl carbonate with a volume ratio of 1:1:2 With a mixed solvent of ethylene carbonate, the electrolyte salt is lithium hexafluorophosphate of 1.2mol / L, and the sodium carbonate containing 75ppm (mass) is contained in the first electrolyte;

[0084] 2) charging to a first predetermined voltage with a predetermined current constant current, and the first predetermined voltage is 3.45V;

[0085] 3) Lower the battery temperature to 4 degrees Celsius, charge at the first predetermined voltage for 12 minutes, and measure the charging current;

[0086] 4) If the charging current is higher than 0.01C, perform the pre-formation process first and then the formation process; if not, perform the formation process directly;

[0087] The pre-forming process includes:

[0088] 1) Constant current discharge...

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PUM

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Abstract

The invention provides a preparation method of a lithium ion battery. A positive electrode active substance of the lithium ion battery is LiMn0.65Co0.25Ni0.1O2, and a negative electrode active substance of the lithium ion battery is a carbon material. The preparation method comprises the following steps of injecting a first electrolyte containing 70-80 ppm (mass) of lithium carbonate into an assembled battery, and charging to a first preset voltage by adopting a preset current in a constant-current manner, reducing the temperature of the battery to 3-5 DEG C, charging for a preset time at a first preset voltage, and measuring a charging current, if the charging current is higher than the preset value, performing a pre-formation process and then performing a formation process, and if not, directly carrying out a formation process. The lithium ion battery prepared by the method provided by the invention has good cycle retention performance and high-rate cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery. Background technique [0002] The ternary electrode material with high manganese content has lower cost and better safety performance. It is one of the preferred battery materials as a battery pack for lithium-ion batteries. However, due to the performance differences of the battery packs , will lead to the attenuation of the single cells in the battery pack and cause the performance of the battery pack to be damaged. Therefore, the present invention provides a method for preparing a lithium-ion battery. The lithium-ion battery prepared by the method of the present invention has good cycle retention performance And high rate cycle performance. Contents of the invention [0003] The invention provides a preparation method of a lithium ion battery, the positive electrode active material of the lithium ion battery is LiMn 0.65 co 0.25 Ni 0.1 o 2 , the negative electrode active ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058H01M10/446Y02P70/50
Inventor 金妍
Owner 东莞市力格新能源科技有限公司