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High-voltage electrolyte additive, high-voltage electrolyte containing same, and lithium ion battery

An electrolyte additive and electrolyte technology, which is applied in the field of lithium ion batteries, can solve the problems of low degree of improvement and difficulty in meeting the needs of use.

Active Publication Date: 2019-10-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium-ion battery improves the cycle stability of the electrolyte under high pressure, but the degree of improvement is not high, and it is still difficult to meet the needs of use

Method used

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  • High-voltage electrolyte additive, high-voltage electrolyte containing same, and lithium ion battery
  • High-voltage electrolyte additive, high-voltage electrolyte containing same, and lithium ion battery
  • High-voltage electrolyte additive, high-voltage electrolyte containing same, and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0055] A kind of high voltage electrolytic solution, its preparation method comprises the steps:

[0056] (1) Mix ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate in a mass ratio of 1:1:1 after using molecular sieve to remove water, then add LiPF 6 Dissolve and mix to make LiPF 6 The concentration is 1.0mol / L;

[0057] (2) Add the additive of the following structural formula to the solution obtained in step (1), mix to obtain a high-voltage electrolyte, and the additive amount is 0.2% of the total mass of the electrolyte.

[0058]

Embodiment 2

[0060] A kind of high voltage electrolytic solution, its preparation method comprises the steps:

[0061] (1) Mix ethylene carbonate, ethyl methyl carbonate and vinylene carbonate in a mass ratio of 1:1:1 after using molecular sieve to remove water, then add LiPF 6 Dissolve and mix to make LiPF 6 The concentration is 1.5mol / L;

[0062] (2) Add the additive of the following structural formula to the solution obtained in step (1), mix to obtain a high-voltage electrolyte, and the additive amount is 0.1% of the total mass of the electrolyte.

[0063]

Embodiment 3

[0065] A kind of high voltage electrolytic solution, its preparation method comprises the steps:

[0066] (1) Mix ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and succinonitrile in a mass ratio of 5:2:2:1 after using molecular sieve to remove water, then add LiPF 6 Dissolve and mix to make LiPF 6 The concentration is 1.0mol / L;

[0067] (2) Add the additive of the following structural formula to the solution obtained in step (1), and mix to obtain a high-voltage electrolyte, and the additive amount is 1.0% of the total mass of the electrolyte.

[0068]

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Abstract

The invention provides a high-voltage electrolyte additive, a high-voltage electrolyte containing the same, and a lithium ion battery. The additive has a structure as shown in a formula I which is described in the specification. The high-voltage electrolyte additive provided by the invention can be preferentially oxidized and decomposed before decomposition of a base solvent, and forms a thin andcompact electrode-electrolyte interface film on the surface of an electrode; through formation of the interface film, continuous contact between an electrode material and the electrolyte can be avoided; decomposition of the electrolyte can be inhibited; the crystal structure of the electrode material can be protected; thus, the loss of reversible capacity in the circulation process is effectivelyreduced; the cyclic stability of a battery is improved; and application of a high-voltage lithium ion battery can be satisfied.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage electrolyte additive, a high-voltage electrolyte containing the additive, and a lithium-ion battery. Background technique [0002] Energy is an important material basis for the survival and development of human society. Each of us cannot live without energy. At present, the energy needed for people's daily life and industrial production mainly comes from traditional non-renewable fossil energy such as coal, oil, and natural gas. With the continuous progress of scientific research, it has been found that batteries with strong oxidizing substances as positive electrode active materials have ideal electrochemical performance, so lithium-ion batteries came into being. Nowadays, most electronic devices use lithium-ion batteries as energy storage components, ranging from portable energy storage devices such as mobile power supplies and laptop computers to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/02H01M10/0525H01M10/0567
CPCC07F5/02C07F5/027H01M10/0525H01M10/0567Y02E60/10
Inventor 张锁江陈仕谋顾士杰崔英粤赵建玲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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