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Lithium ion battery high-voltage electrolyte and preparation method and application thereof

A lithium-ion battery and electrolyte technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, organic electrolytes, etc., can solve the problems of unsatisfactory battery cycle stability and rate performance, limited stability and protection effect of positive electrode materials, etc., to improve the cycle. Stability, reduction of electrochemical activity, and effect of stabilizing the surface structure of the positive electrode

Inactive Publication Date: 2018-05-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing electrolyte has a limited effect on the stability and protection of the positive electrode material under high voltage, and the cycle stability and rate performance of the battery are not ideal

Method used

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  • Lithium ion battery high-voltage electrolyte and preparation method and application thereof
  • Lithium ion battery high-voltage electrolyte and preparation method and application thereof
  • Lithium ion battery high-voltage electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 and embodiment 4 adopt (R in formula 1-A 1 , R 2 , R 3 The substituents are all CN) purchased from Beijing Bailingwei Technology Co., Ltd.

[0058] Embodiment 2,3,5 adopts (R in formula 1-B 1 , R 2 Substituents are CN, R 3 The substituent is a F) purchased from Beijing Bailingwei Technology Co., Ltd.

Embodiment 6

[0059] Embodiment 6 adopts (R in formula 1-C 1 , R 2 , R 3 The substituents are all -CF 3 ) was purchased from Beijing Bailingwei Technology Co., Ltd.

[0060] Example 1

[0061] (1) Mix cyclic carbonate (EC) and linear carbonate diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) in argon-containing glove box at a mass ratio of 1:1:1, using molecular sieves and Lithium hydride removes water and impurities;

[0062] (2) Inorganic conductive lithium salt LiPF 6 Add to the mixed solvent obtained in step (1), control the lithium salt concentration to 1mol / L, and stir at room temperature for 2 hours to obtain the basic electrolyte;

[0063] (3) Stir the additive with a 4A molecular sieve to remove water and impurities; the stirring time is 1 hour;

[0064] (4) the treated additive obtained in step (3) (in formula 1-A, R 1 , R 2 , R 3 The substituents are all CN) added to the basic electrolyte obtained in step (2), the addition amount is 0.5% of the mass of the basic...

Embodiment 2

[0066] (1) Mix cyclic carbonate (EC) and linear carbonate diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) in argon-containing glove box at a mass ratio of 3:2:5, using molecular sieves and Lithium hydride removes water and impurities;

[0067] (2) Inorganic conductive lithium salt LiPF 6 Add to the mixed solvent obtained in step (1), control the lithium salt concentration to 1mol / L, and stir at room temperature for 2 hours to obtain the basic electrolyte;

[0068] (3) Stir the additive with a 4A molecular sieve to remove water and impurities; the stirring time is 1 hour;

[0069] (4) the processed additive (formula 1-B, R 1 , R 2 Substituents are CN, R 3 The substituent is one F) added to the basic electrolyte obtained in step (2), the addition amount is 1% of the mass of the basic electrolyte, mixed uniformly, to obtain a high-voltage electrolyte for lithium-ion batteries.

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Abstract

The invention discloses a lithium ion battery high-voltage electrolyte and belongs to the technical field of lithium ion secondary materials. The lithium ion battery high-pressure electrolyte comprises a functional additive, a solvent and an inorganic conductive lithium salt. The functional additive comprises at least one of compounds having the structural formula 1. In R1, R2, and R3, at least one of the substituents is F, SR4, P(R5)R6, C2-C16 alkene, C2-C16 alkyne or CN, and the other substituents are C1-C6 alkane, Br, Cl, I, C1-C6 alkoxy, F, S, C2-C16 alkene, C2-C16 alkyne or CN. R4, R5 andR6 represents H or C1-C6 alkane. The invention also discloses an application of the electrolyte. The functional additive is added in the electrolyte and can form a dense coating film on the surface of the positive electrode of the lithium ion battery so that the electrochemical activity of the surface of the positive electrode material during the cycle is reduced, the oxidative decomposition of the electrolyte solvent is inhibited, the positive electrode material structure is stable and the cycle stability and rate performance of the lithium ion battery under high voltage are improved.

Description

technical field [0001] The invention relates to a lithium-ion battery high-voltage electrolyte, which belongs to the field of lithium-ion batteries. Background technique [0002] The energy issue is one of the major issues facing mankind in the 21st century, and it has received great attention from all countries in the world. As an emerging new energy source, lithium-ion batteries are developing rapidly. With the gradual reduction of traditional energy sources such as coal, oil, and natural gas and increasingly severe environmental problems, the demand for small separated mobile power supplies is showing a geometric growth trend, and various rechargeable electrochemical power supplies are receiving more and more attention. Because of the characteristics of high energy density, high cut-off voltage and long cycle life, it has considerable commercial prospects. Common commercial lithium-ion cathode materials include lithium iron phosphate, lithium cobalt oxide, and nickel-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058
CPCH01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 洪波赖延清覃昭铭段柏禹张治安张凯方静
Owner CENT SOUTH UNIV
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