A kind of formation method of low temperature lithium ion battery

A lithium-ion battery, a technology of a chemical formation method, which is applied in the manufacture of secondary batteries, electrochemical generators, electrolyte batteries, etc., can solve the problems of unable to exert normal capacity, unable to exert capacity of batteries, and attenuation of battery capacity, and achieve low performance attenuation. , The effect of restoring battery capacity and improving low temperature performance

Active Publication Date: 2021-08-31
YICHUN JINHUI NEW ENERGY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries at low temperatures, due to the increase in the viscosity of the electrolyte, the conductivity decreases, which affects the rate performance, and due to the polarization of the electrodes inside the battery, the battery cannot exert its original capacity at low temperatures. Using it under low temperature will cause the battery capacity to fade, even if the temperature returns to normal, it will not be able to play the normal capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Inject the electrolyte solution, let it stand for 1 hour, vacuumize and seal it, the content of N,N-dimethyltrifluoroacetamide in the electrolyte solution is 1% by volume, and the content of vinylene carbonate is 3.5% by volume %;

[0028] 2) Charge to the first predetermined voltage with a constant current of 0.01C, and the first predetermined voltage is 3.05V;

[0029] 3) Lower the battery temperature to -10°C;

[0030] 4) Carry out a constant current pulse charge and discharge cycle between the first predetermined voltage and the second predetermined voltage, the second predetermined voltage is 3.15V, the pulse charge and discharge cycle includes charging to the second predetermined voltage with a current pulse of 0.02C, and then The current pulse of 0.02C is discharged to the first predetermined voltage, the pulse time is 30s, and the interval is 3s;

[0031] 5) Constant voltage charging with the second predetermined voltage until the charging current is less t...

Embodiment 2

[0036] 1) Inject the electrolyte solution, let it stand for 1 hour, vacuumize and seal it, the content of the N,N-dimethyltrifluoroacetamide in the electrolyte solution is 1.5% by volume, and the content of the vinylene carbonate is 5 volume % %;

[0037] 2) Charge to the first predetermined voltage with a constant current of 0.02C, and the first predetermined voltage is 3.10V;

[0038] 3) Lower the battery temperature to 0°C;

[0039] 4) Carry out a constant current pulse charge and discharge cycle between the first predetermined voltage and the second predetermined voltage, the second predetermined voltage is 3.20V, the pulse charge and discharge cycle includes charging to the second predetermined voltage with a current pulse of 0.05C, and then A current pulse of 0.05C is discharged to the first predetermined voltage, and the pulse time is 10s with an interval of 1s;

[0040] 5) Constant voltage charging with the second predetermined voltage until the charging current is l...

Embodiment 3

[0045] 1) Inject the electrolyte solution, let it stand for 1 hour, vacuumize and seal it, the content of the N,N-dimethyltrifluoroacetamide in the electrolyte solution is 1.2% by volume, and the content of the vinylene carbonate is 4.3% by volume %;

[0046] 2) Charge to the first predetermined voltage with a constant current of 0.01C, and the first predetermined voltage is 3.08V;

[0047] 3) Lower the battery temperature to -5°C;

[0048] 4) Carry out a constant current pulse charge and discharge cycle between the first predetermined voltage and the second predetermined voltage, the second predetermined voltage is 3.18V, the pulse charge and discharge cycle includes charging to the second predetermined voltage with a current pulse of 0.03C, and then A current pulse of 0.03C is discharged to the first predetermined voltage, and the pulse time is 20s with an interval of 2s;

[0049] 5) Constant voltage charging with the second predetermined voltage until the charging current...

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PUM

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Abstract

The invention provides a method for forming a low-temperature lithium-ion battery. The electrolyte of the lithium-ion battery contains an organic solvent and an additive, the organic solvent is composed of DMC and EC, and the additive includes N,N-dimethyl Trifluoroacetamide and vinylene carbonate, the volume ratio of the N,N-dimethyltrifluoroacetamide and vinylene carbonate is 1:3.5-3.7; the present invention formulates specific electrolytes and additives Formation method, at low temperature, pulse charge-discharge cycle is performed between the first predetermined voltage and the second predetermined voltage, thereby improving the low-temperature cycle performance of the battery. After the battery through this formation method, after the working temperature returns to normal, it can still be used. Normal capacity.

Description

technical field [0001] The invention relates to a method for forming a low-temperature lithium ion battery. Background technique [0002] Lithium-ion batteries at low temperatures, due to the increase in the viscosity of the electrolyte, the conductivity decreases, which affects the rate performance, and due to the polarization of the electrodes inside the battery, the battery cannot exert its original capacity at low temperatures. Using it under low conditions will cause the battery capacity to fade, even if the temperature returns to normal, it will not be able to play the normal capacity. The invention provides a method for forming a low-temperature lithium-ion battery. After the battery undergoes the method, the battery can still exert a normal capacity after the working temperature returns to normal. Contents of the invention [0003] The invention provides a method for forming a low-temperature lithium-ion battery. The electrolyte of the lithium-ion battery contains...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M10/058H01M2300/0025H01M2300/0037Y02E60/10Y02P70/50
Inventor 陈柏源钱起
Owner YICHUN JINHUI NEW ENERGY MATERIALS
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