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Non-aqueous electrolyte and lithium ion battery

A technology of non-aqueous electrolyte and lithium salt, which is applied in the field of electrochemistry, and can solve the problems of no examples, no specific points, no further involvement of phenyl carbonate, etc.

Active Publication Date: 2019-02-26
宁德国泰华荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although patents CN 104995784 A and CN 102544585 A mention phenyl carbonates as additives, combined with other non-aqueous solvents, electrolyte salts, and additives, they can improve the durability, capacity, resistance, and output characteristics of lithium-ion secondary batteries. However, there is no specific reference to a certain substance, no examples, and no further reference to the impact of the use of phenyl carbonate derivatives such as cyano-containing phenyl carbonate on lithium-ion secondary batteries

Method used

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  • Non-aqueous electrolyte and lithium ion battery
  • Non-aqueous electrolyte and lithium ion battery
  • Non-aqueous electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The organic solvents are ethylene carbonate, diethyl carbonate, ethyl methyl carbonate, and ethyl propionate, which account for 20%, 20%, 35%, and 10% of the total mass ratio of the electrolyte; the electrolyte lithium salt is LiPF 6 , and the proportion of lithium salt is 12.5%, the proportion of fluoroethylene carbonate is 0.5%, the proportion of lithium difluorooxalate borate is 0.1%, the proportion of succinic anhydride is 0.1%, and the proportion of 1,3-propane sultone is 0.2 %, the ratio of tris(trimethylsilane) phosphate is 0.1%, The proportion is 1.5%, and the electrolyte solution obtained above is applied to a 1Ah NCA polymer pouch battery, which is denoted as S1.

Embodiment 2

[0043] The organic solvents are ethylene carbonate, diethyl carbonate, ethyl methyl carbonate, and ethyl propionate, which account for 20%, 20%, 35%, and 10% of the total mass ratio of the electrolyte; the electrolyte lithium salt is LiPF 6 , and the proportion of lithium salt is 12.5%, the proportion of fluoroethylene carbonate is 0.5%, the proportion of lithium difluorooxalate borate is 0.3%, the proportion of succinic anhydride is 0.2%, and the proportion of 1,3-propane sultone is 0.3 %, the ratio of tris(trimethylsilane) phosphate is 0.2%, The ratio is 1.0%, and the electrolyte solution obtained above is applied to a 1Ah NCA polymer pouch battery, which is denoted as S2.

Embodiment 3

[0045] The organic solvents are ethylene carbonate, diethyl carbonate, ethyl methyl carbonate, and ethyl propionate, which account for 20%, 20%, 35%, and 10% of the total mass ratio of the electrolyte; the electrolyte lithium salt is LiPF 6 , and the proportion of lithium salt is 12.5%, the proportion of fluoroethylene carbonate is 0.5%, the proportion of lithium difluorooxalate borate is 0.3%, the proportion of succinic anhydride is 0.3%, and the proportion of 1,3-propane sultone is 0.3 %, the ratio of tris(trimethylsilane) phosphate is 0.3%, The ratio is 0.8%, and the electrolyte solution obtained above is applied to a 1Ah NCA polymer pouch battery, which is denoted as S3.

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Abstract

The invention relates to a non-aqueous electrolyte, comprising a lithium salt, an organic solvent and additives, wherein the additives comprise an additive A. The additive A is one or more selected from the group consisting of substances as shown in a general structural formula which is described in the specification. In the above formula, R1 is one selected from the group consisting of alkyl groups, and substituted or unsubstituted phenyl groups, wherein the substitution is partial substitution or complete substitution, and a substituent is one or more selected from the group consisting of analkyl group, a carboxyl group, a cyano group, an alkylthio group, and an amino group; and R2 and R3 are independently selected from the group consisting of hydrogen, an ester group, a carboxyl group,a cyano group, an alkylthio group, an amino group, and a nitro group, and at least one of R2 and R3 is not hydrogen. According to research results of the invention, the additive A having a structurerepresented by the general structural formula can improve the high-temperature storage performance, low-temperature discharge performance and safety performance of a battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a nonaqueous electrolytic solution and a lithium ion battery. Background technique [0002] Compared with other batteries, lithium-ion batteries have the advantages of higher specific energy, high specific power, no memory effect, and no pollution, and stand out among many types of batteries. [0003] CN101960662 A discloses a non-aqueous electrolyte and a non-aqueous electrolyte battery. The non-aqueous electrolyte contains benzene carbonates (such as the methyl phenyl carbonate disclosed in the examples), and contains C=C unsaturated At least one of cyclic carbonates with bonds, cyclic carbonates with fluorine atoms, monofluorophosphates, and difluorophosphates. The nonaqueous electrolyte can fully improve the safety of the nonaqueous electrolyte battery during overcharging. properties, and has high capacity, as well as excellent high-temperature storage c...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M10/4235H01M2300/0042Y02E60/10
Inventor 陈黎甘朝伦陈晓荣王婷婷孙操
Owner 宁德国泰华荣新材料有限公司
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