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A high-voltage ternary cathode material system lithium-ion battery electrolyte

A technology of lithium ion battery and positive electrode material, which is applied in the field of high voltage ternary positive electrode material system lithium ion battery electrolyte, can solve the problems of large irreversible capacity of first charge and discharge, loss of reversible capacity of battery, inability to effectively suppress gas production, etc. The effect of high capacity retention and capacity recovery, improved thermal stability, improved cycle performance and high temperature performance

Active Publication Date: 2017-11-24
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among the commonly used high-temperature additives for lithium-ion battery electrolytes at this stage: 1,3-propane sultone (1,3-PS) and 1,4-butane sultone (1,4-BS) Additives still cannot effectively inhibit the gas production of high-voltage ternary batteries under high-temperature conditions; 1,3-propene sultone (1,3-PST) significantly inhibits high-temperature gas production, but it has too thick a film, the first charge and discharge The problem of large irreversible capacity and poor cycle performance
The Chinese patent with the publication number CN104332650A adopts the technical route of "methylene disulfonate + fluoroethylene carbonate" to prepare a high-voltage electrolyte for lithium-ion batteries with a high-nickel ternary cathode material system, fluoroethylene carbonate It has good negative electrode film-forming performance and can effectively improve the battery cycle, but its instability under high temperature conditions can easily cause battery gas production and serious loss of battery reversible capacity

Method used

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  • A high-voltage ternary cathode material system lithium-ion battery electrolyte
  • A high-voltage ternary cathode material system lithium-ion battery electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In a glove box filled with argon, add methanedisulfonate in sequence to the mixed non-aqueous solvent of ethylene carbonate, propylene carbonate, ethyl methyl carbonate and diethyl carbonate with a mass ratio of 25:5:15:55. Methyl ester, lithium bis(fluorosulfonyl)imide, succinic anhydride (accounting for 0.5%, 1.0%, and 1.0% of the total mass of the electrolyte), ethylene carbonate, succinonitrile, and 1,2-bis (2-cyanoethoxy) ethane (addition accounts for 0.2%, 2.0% and 0.5% of the total mass of the electrolyte) additive; finally slowly add lithium hexafluorophosphate accounting for 12.5% ​​of the total mass of the electrolyte to the mixed solution, and stir evenly Obtain the lithium ion battery electrolyte of embodiment 1 afterward.

Embodiment 2

[0030] In a glove box filled with argon, add methylene disulfonate, bis(tri Lithium fluoromethanesulfonyl)imide, succinic anhydride (the amount added is 2.0%, 0.5%, 0.5% of the total mass of the electrolyte), vinyl sulfate, 1,3-propane sultone and 1,3,6 -Hexane trinitrile (addition accounts for 0.5%, 1.0% and 2.0% of the total mass of the electrolyte) additive; finally slowly add lithium hexafluorophosphate accounting for 13.0% of the total mass of the electrolyte to the mixed solution, and stir to obtain Example 2 lithium-ion battery electrolyte.

Embodiment 3

[0032] In a glove box filled with argon gas, methylene disulfonate, bis(fluorosulfonate Lithium imide, methyl succinic anhydride (accounting for 0.5%, 2.0%, 1.0% of the total mass of the electrolyte) and vinylene carbonate, adiponitrile and 1,2-bis(2-cyanoethoxy Base) ethane (the addition accounts for respectively 0.5%, 2.0% and 0.5% of the total mass of the electrolytic solution) additive; Finally, slowly add lithium hexafluorophosphate accounting for 12% of the total mass of the electrolytic solution to the mixed solution, and obtain the solution of Example 3 after stirring evenly. Lithium-ion battery electrolyte.

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Abstract

The invention provides a lithium-ion battery electrolyte for a high-voltage ternary positive electrode material system. The lithium-ion battery electrolyte comprises a non-aqueous solvent, lithium hexafluorophate and a functional additive; the functional additive comprises a cyclic anhydride compound, a lithium salt type additive and methylene methanedisulfonate; the general structural formula of the cyclic anhydride compound is as shown in the description, wherein R1, R2, R3 and R4 are independently selected from any one of hydrogen atom, fluorine atom, or straight chain or branched chain alkyl with the number of carbon atoms of 1-4. The cyclic anhydride compound used in the lithium-ion battery electrolyte is higher in reduction potential (the reduction potential of succinic anhydride is 1.50 V vs Li+ / Li) on the negative electrode surface, so that other components in the electrolyte can be preferably reduced into films in the first charging process of the battery, the formed SEI film is high in stability. The cyclic anhydride compound used in the lithium-ion battery electrolyte is capable of effectively improving the cycle performance and high-temperature performance of the battery; and compared with fluoroethylene carbonate, the cyclic anhydride compound has excellent high-temperature performance as well as capability of improving the cycle performance.

Description

technical field [0001] The invention relates to the field of lithium-ion battery electrolyte, and more specifically, the invention relates to a high-voltage ternary positive electrode material system lithium-ion battery electrolyte. Background technique [0002] In recent years, with the development of portable electronic devices, power tools, and electric vehicles, higher requirements have been placed on the energy density of lithium-ion batteries. The current commercial lithium iron phosphate batteries and lithium cobalt oxide batteries are either limited by energy density, or by cost and safety performance, and cannot meet the needs of large quantities of electric tools and electric vehicles for the use of batteries. [0003] LiNi x mn y co 1-x-y o 2 The ternary cathode material is considered to be the mainstream cathode material for the new generation of lithium-ion batteries due to its advantages of low cost, good safety, and high gram capacity, and is a hot researc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 仰永军吕家斌许梦清韩鸿波万华平
Owner GUANGZHOU TINCI MATERIALS TECH
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