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Formation method of lithium ion battery

A lithium-ion battery and formation method technology, which is applied in the field of formation of lithium-ion batteries, can solve the problems of difficult to balance high-temperature and low-temperature performance, the use temperature window is not very wide, and the high-temperature capacity retention rate is poor, so as to shorten the formation time, Effects of improving cycle performance and simplifying chemical synthesis process

Inactive Publication Date: 2021-02-05
苏州极闪控电信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries have good safety performance and cycle life, but the operating temperature window is not very wide. Generally, the low-temperature performance of high-temperature batteries is poor, and the high-temperature capacity retention rate of low-temperature batteries is poor. This is due to the limitation of the battery electrolyte. Difficult to balance high and low temperature performance

Method used

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  • Formation method of lithium ion battery
  • Formation method of lithium ion battery

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Experimental program
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Embodiment 1

[0027] 1) The electrolyte is injected into the battery to be injected, and the electrolyte includes linear carbonates and cyclic carbonates, electrolyte salts and additives; the linear carbonates account for 50% of the total electrolyte volume, and the rest are cyclic carbonates. Carbonate; wherein the additives include fluoroethylene carbonate, divinyl sulfone and α, α-dimethyl-γ-butyrolactone, wherein the volume concentration of the additive satisfies the following relationship, (volume of fluoroethylene carbonate concentration+α, the volume concentration of α-dimethyl-γ-butyrolactone)*the volume of linear carbonate=k*divinyl sulfone*the volume of cyclic carbonate, wherein k=1.62; the fluorinated The volume concentration of ethylene carbonate: α, the volume concentration of α-dimethyl-γ-butyrolactone=1:1.6, the volume concentration of described divinyl sulfone is 2.4%, the volume concentration of fluoroethylene carbonate is 1.50%, the volume concentration of α,α-dimethyl-γ-b...

Embodiment 2

[0035] 1) Inject the electrolyte into the battery to be injected, the electrolyte includes linear carbonate and cyclic carbonate, electrolyte salt and additives; the linear carbonate accounts for 55% of the total electrolyte volume, and the rest is ring Carbonate; wherein the additives include fluoroethylene carbonate, divinyl sulfone and α, α-dimethyl-γ-butyrolactone, wherein the volume concentration of the additive satisfies the following relationship, (volume of fluoroethylene carbonate concentration+α, the volume concentration of α-dimethyl-γ-butyrolactone)*the volume of linear carbonate=k*divinyl sulfone*the volume of cyclic carbonate, wherein k=1.65; the fluorinated The volume concentration of ethylene carbonate: α, the volume concentration of α-dimethyl-γ-butyrolactone=1:1.6, the volume concentration of described divinyl sulfone is 2.6%, the volume concentration of fluoroethylene carbonate is 1.35%, the volume concentration of α,α-dimethyl-γ-butyrolactone is 2.16%;

[...

Embodiment 3

[0043] 1) The electrolyte is injected into the battery to be injected, and the electrolyte includes linear carbonates and cyclic carbonates, electrolyte salts and additives; the linear carbonates account for 50% of the total electrolyte volume, and the rest are cyclic carbonates. Carbonate; wherein the additives include fluoroethylene carbonate, divinyl sulfone and α, α-dimethyl-γ-butyrolactone, wherein the volume concentration of the additive satisfies the following relationship, (volume of fluoroethylene carbonate concentration+α, the volume concentration of α-dimethyl-γ-butyrolactone)*the volume of linear carbonate=k*divinyl sulfone*the volume of cyclic carbonate, wherein k=1.64; the fluorinated The volume concentration of ethylene carbonate: α, the volume concentration of α-dimethyl-γ-butyrolactone=1:1.6, the volume concentration of described divinyl sulfone is 2.5%, the volume concentration of fluoroethylene carbonate is 1.58%, the volume concentration of α,α-dimethyl-γ-b...

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Abstract

The invention provides a formation method of a lithium ion battery. An electrolyte of the lithium ion battery comprises linear carbonic ester, cyclic carbonic ester, electrolyte salt and additives, wherein the additives comprise fluoroethylene carbonate, divinyl sulfone and alpha, alpha-dimethyl-gamma-butyrolactone. The formation method comprises the following steps: injecting the electrolyte intoa to-be-injected battery, carrying out constant-current charging to a first predetermined voltage, then carrying out pulse charging and discharging circulation between the first predetermined voltageand a second predetermined voltage for multiple times, vacuumizing and exhausting during the pulse charging and discharging circulation, then carrying out constant-current charging to a charging cut-off voltage, standing, then charging and discharging for a plurality of times at the charging cut-off voltage and the discharging cut-off voltage, vacuumizing, exhausting, and sealing to obtain the battery. The lithium ion battery obtained by the formation method disclosed by the invention has good high-temperature performance and low-temperature performance.

Description

technical field [0001] The invention relates to a method for forming a lithium ion battery. Background technique [0002] Lithium-ion batteries have good safety performance and cycle life, but the operating temperature window is not very wide. Generally, the low-temperature performance of high-temperature batteries is poor, and the high-temperature capacity retention rate of low-temperature batteries is poor. This is due to the limitation of the battery electrolyte. It is difficult to balance high temperature and low temperature performance. The invention provides an electrolyte solution of a battery and a corresponding formation method, which can make the lithium-ion battery have good high-temperature performance and low-temperature performance. Contents of the invention [0003] The invention provides a method for forming a lithium ion battery. The electrolyte of the lithium ion battery includes linear carbonates and cyclic carbonates, electrolyte salts and additives; w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/44
CPCH01M10/0525H01M10/0567H01M10/446Y02E60/10
Inventor 陈来宾
Owner 苏州极闪控电信息技术有限公司
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