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Preparation method of lithium ion battery with long storage performance

A lithium-ion battery and storage performance technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of storage performance affecting battery continuous use performance, generation of metal dendrites, capacity attenuation, etc., and achieve storage performance improvement , good electrode stability, and the effect of inhibiting decomposition reactions

Inactive Publication Date: 2020-06-12
钱起
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The storage performance of lithium-ion batteries directly affects the continuous use performance of batteries. After storage, most lithium-ion batteries will suffer from capacity decay due to partial self-discharge and active material dissolution, and more seriously, due to active material dissolution. Metal dendrites are produced on the surface of the negative electrode, leading to dangers such as short circuit of the battery

Method used

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  • Preparation method of lithium ion battery with long storage performance
  • Preparation method of lithium ion battery with long storage performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Laminate the positive electrode, diaphragm, and negative electrode to form a battery cell, place it in the battery case, inject liquid, and let it stand for 2 hours. In the electrolyte, dimethyl sulfoxide (DMSO) is 0.8% by volume, trifluoroethylphosphine Acid (TTFP) is 1.5% by volume; Hexylbenzene (CHB) is 2.2% by volume;

[0031] 2) Pulse charging to 3.75V, pulse current 0.02C, pulse time 60s, interval 5s;

[0032] 3) Charge at a constant voltage of 3.75V until the charging current is less than 0.01C;

[0033] 4) Stand still for 1h;

[0034] 5) Adjust the battery temperature to 40°C, and charge again at a constant voltage of 3.75V until the charging current is less than 0.01C;

[0035] 6) Aging at 40°C for 3 hours;

[0036] 7) adjust to room temperature;

[0037] 8) 0.1C constant current charging to 4.2V, and then 4.2V constant voltage charging until the charging current is less than 0.01C;

[0038] 9) Charge and discharge cycle 3 times with 0.1C constant curre...

Embodiment 2

[0041] 1) Laminate the positive electrode, diaphragm, and negative electrode to form a battery cell, place it in the battery case, inject liquid, and let it stand for 2 hours. In the electrolyte, dimethyl sulfoxide (DMSO) is 1.2% by volume, trifluoroethylphosphine Acid (TTFP) is 2.0% by volume; Hexylbenzene (CHB) is 2.6% by volume;

[0042] 2) Pulse charging to 3.80V, pulse current 0.1C, pulse time 30s, interval 2s;

[0043] 3) Charge at a constant voltage of 3.80V until the charging current is less than 0.01C;

[0044] 4) Stand still for 1h;

[0045] 5) Adjust the battery temperature to 50°C, and charge again at a constant voltage of 3.80V until the charging current is less than 0.01C;

[0046] 6) Aging at 50°C for 3 hours;

[0047] 7) adjust to room temperature;

[0048] 8) 0.1C constant current charging to 4.2V, and then 4.2V constant voltage charging until the charging current is less than 0.01C;

[0049] 9) Charge and discharge cycle 3 times with 0.1C constant curren...

Embodiment 3

[0052] 1) Laminate the positive electrode, diaphragm, and negative electrode to form a battery cell, place it in the battery case, inject liquid, and let it stand for 2 hours. In the electrolyte, dimethyl sulfoxide (DMSO) is 1% by volume, trifluoroethylphosphine Acid (TTFP) is 1.8% by volume; Hexylbenzene (CHB) is 2.4% by volume;

[0053] 2) Pulse charging to 3.78V, pulse current 0.05C, pulse time 40s, interval 3s;

[0054] 3) Charge with a constant voltage of 3.78V until the charging current is less than 0.01C;

[0055] 4) Stand still for 1h;

[0056] 5) Adjust the battery temperature to 45°C, and charge again at a constant voltage of 3.78V until the charging current is less than 0.01C;

[0057] 6) Aging at 45°C for 3 hours;

[0058] 7) adjust to room temperature;

[0059] 8) 0.1C constant current charging to 4.2V, and then 4.2V constant voltage charging until the charging current is less than 0.01C;

[0060] 9) Charge and discharge cycle 3 times with 0.1C constant curre...

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Abstract

The invention provides a preparation method of a lithium ion battery with long storage performance, an active substance in a positive electrode in the lithium ion battery is LiCo0.97Al0.1Mg0.2O2, andthe positive electrode also comprises polyaniline accounting for 2-3% by mass of the active substance; the negative electrode of the lithium ion battery is a graphite negative electrode and can be selected from natural graphite or artificial graphite; the chain carbonate in the electrolyte of the lithium ion battery accounts for less than 20% of the total volume of the electrolyte, and the electrolyte comprises an additive composed of dimethyl sulfoxide (DMSO), trifluoroethyl phosphonic acid (TTFP) and hexylbenzene (CHB). The preparation method comprises the following steps: stacking a positive electrode, a diaphragm and a negative electrode to prepare a battery cell, placing the battery cell in a battery shell, injecting liquid, and performing formation, wherein the formation comprises aconstant-voltage charging process under a predetermined voltage, and the lithium ion battery obtained by the preparation method disclosed by the invention can be stored for a long time without capacity attenuation, and has good storage performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery with long storage performance. Background technique [0002] The storage performance of lithium-ion batteries directly affects the continuous use performance of batteries. After storage, most lithium-ion batteries will suffer from capacity decay due to partial self-discharge and active material dissolution, and more seriously, due to active material dissolution. Metal dendrites are produced on the surface of the negative electrode, which leads to dangers such as short circuit of the battery. Contents of the invention [0003] The invention provides a preparation method of a lithium-ion battery with long storage performance, the active material in the positive electrode of the lithium-ion battery is LiCo 0.97 Al 0.1 Mg 0.2 o 2 , and the positive electrode also includes polyaniline accounting for 2-3% by mass of the active material; the negative electrode of the lithium ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0566H01M10/0567H01M10/0525
CPCH01M4/362H01M4/485H01M4/525H01M4/62H01M4/628H01M10/0525H01M10/0566H01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 钱起
Owner 钱起
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