A kind of lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as equipment damage, explosion, battery capacity attenuation, etc., and achieve the effects of reducing gas generation, improving safety performance, and reducing thickness expansion

Active Publication Date: 2021-12-14
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time as the battery capacity decays and performance declines, the decomposition of the electrode passivation film and solvent will also produce a large amount of gas, causing the battery to expand too thickly, and even cause safety problems such as bursting or explosion, resulting in damage to equipment or personal injury.
[0005] In addition, the extensive use of 1,3-propane sultone (PS), a high-temperature additive commonly used in electrolyte additives, has brought environmental problems to the battery industry

Method used

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  • A kind of lithium ion battery electrolyte and lithium ion battery
  • A kind of lithium ion battery electrolyte and lithium ion battery
  • A kind of lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Positive electrode preparation: mix the high-voltage 4.40V ternary 532 positive electrode active material, CNTs (carbon nanotubes) and PVDF (polyvinylidene fluoride) according to the mass ratio of 98.0:0.8:1.2, and then disperse them in N-methyl - 2-pyrrolidone to obtain positive electrode slurry; apply the positive electrode slurry evenly on both sides of the aluminum foil, dry, roll, and cut to obtain the positive electrode sheet, and finally bake and vacuum dry it for use.

[0041] (2) Negative electrode preparation: Mix artificial graphite negative electrode material, acetylene black, CMC (carboxymethyl cellulose), SBR (carboxylated styrene-butadiene rubber) according to the mass ratio of 96.8:1.0:1.2:1.0, and then disperse them in deionized water , to obtain the negative electrode slurry; the negative electrode slurry is evenly coated on both sides of the copper foil, and after drying, rolling, and cutting, the negative electrode sheet is obtained, and finally i...

Embodiment 2

[0045] Different from Example 1 is the preparation of electrolyte: in the glove box (O) that is full of nitrogen 2 2 (0<3ppm), mix ethylene carbonate, propylene carbonate, ethyl methyl carbonate, and diethyl carbonate according to the mass ratio of 2:2:4:2 to obtain a non-aqueous organic solvent; A non-aqueous organic solvent with a mass of 78.5%, to which 1% vinylene carbonate, 2% fluoroethylene carbonate, 1% adiponitrile, 1% 1,3,6-hexane Alkane trinitrile and 0.5% cyanuric acid ester compound B1 to obtain a mixed solution; then slowly add lithium hexafluorophosphate accounting for 15% of the total mass of the electrolyte and 0.5% of the total mass of the electrolyte Lithium difluorooxalate borate to the mixed solution and a mixture of lithium difluorophosphate accounting for 0.5% of the total mass of the electrolyte, and the electrolyte is prepared after being uniformly mixed.

[0046] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0048] Different from Example 1 is the preparation of electrolyte: in the glove box (O) that is full of nitrogen 2 2 O<3ppm), mix ethylene carbonate, butylene carbonate, ethyl methyl carbonate, diethyl carbonate, propyl acetate, and ethyl monofluoroacetate in a mass ratio of 2:2:3:2:0.5:0.5 Uniformly, the non-aqueous organic solvent is obtained; Then get the non-aqueous organic solvent accounting for 78% of the total mass of the electrolytic solution, add 1% vinylene carbonate, 2% fluoroethylene carbonate, 0.5% based on the total mass of the electrolytic solution, wherein % of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether, 1% of adiponitrile, 1% of 1,3,6-hexanetrinitrile, 0.25 % isocyanurate compound A2 and 0.25% cyanurate compound B2 to obtain a mixed solution; then slowly add lithium hexafluorophosphate accounting for 15% of the total mass of the electrolyte to the mixed solution, accounting for 0.5% of the total mass of the electrolyte % of lithium bisoxalate bo...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery electrolyte, including organic solvents, lithium salts and additives, wherein the additives include isocyanurate compounds and / or cyanurate compounds, Both the isocyanurate compound and the cyanurate compound contain a carbonate group, a carbon-carbon double bond-containing group and a fluorine-containing group. The use of additives in the electrolyte of the present invention improves the compatibility with organic solvents, can effectively improve the stability of the passivation film, and forms an excellent solid electrolyte interfacial film during formation, so that the battery can be reduced under high temperature and high pressure conditions. The generation of gas reduces the thickness expansion of the battery, prolongs the cycle life of the battery, and improves the safety performance of the battery. In addition, the use of additives in the electrolyte of the present invention can effectively reduce or replace the environmental protection problems brought by the extensive use of commonly used high-temperature additive 1,3-propane sultone to the battery industry.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] In recent years, with the increasing demand for lithium-ion batteries in electronic products and electric vehicles, lithium-ion batteries have developed rapidly. At the same time, the requirements for high energy density and high power of batteries have also been continuously improved. Lithium-manganese materials, high-voltage lithium cobaltate, high-voltage ternary materials, etc. have been applied, and the voltage of batteries is constantly increasing. [0003] During the formation process of lithium-ion batteries, a relatively stable passivation film (also known as solid electrolyte interface film or SEI film) is formed on the surface of the negative electrode. The passivation film must be able to withstand high pressure, high temperature and good wettability to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 高学友高歌吴豪杰张霞朱坤庆计阳楚英张涛
Owner 东莞维科电池有限公司
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