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A kind of electrolyte solution for high-voltage lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as easy decomposition and battery performance degradation, and achieve the effects of improving solubility, increasing energy density, and high anode stability

Active Publication Date: 2018-01-09
南宁翌思达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects in the prior art that the lithium-ion electrolyte is easy to decompose under high voltage, resulting in a decrease in battery performance, the purpose of the present invention is to provide an electrolyte that can increase the energy density of a lithium battery and has good stability under high voltage , the electrolyte can significantly prolong the service life of lithium batteries and improve safety performance

Method used

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  • A kind of electrolyte solution for high-voltage lithium-ion battery
  • A kind of electrolyte solution for high-voltage lithium-ion battery
  • A kind of electrolyte solution for high-voltage lithium-ion battery

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Embodiment 1

[0041] A high-voltage lithium-ion battery electrolyte was prepared in a glove box filled with argon gas with a purity of 99.999%, the moisture in the glove box was controlled at ≤1ppm, and the temperature was room temperature. In the electrolyte of high-voltage lithium-ion batteries, fluoroalkenyl 3-nitro-4-fluoroalkylphenyl sulfones (wherein R 1 for -CHFCHF-, R 2 for -CH=CHCF 2 -) accounts for 30% of the total mass of the solvent, fluorinated dinitrile dialkyl ethers (wherein R 3 for-CF 2 CHF-,R 4 for -CH 2 CHFCF 2-) accounts for 30% of the total mass of the solvent, dimethyl carbonate accounts for 40% of the total mass of the solvent, the molar concentration of the lithium salt LiF in the non-aqueous solvent is 1.0mol / L, and the lithium salt co-solvent triisopropylidene acetonyl boron The quality of alkane is 5% of the solvent quality, and the negative electrode film-forming additive lithium dioxalate borate is 5% of the solvent quality.

Embodiment 2

[0043] A high-voltage lithium-ion battery electrolyte was prepared in a glove box filled with argon gas with a purity of 99.999%, the moisture in the glove box was controlled at ≤1ppm, and the temperature was room temperature. In the electrolyte of high-voltage lithium-ion batteries, fluoroalkenyl 3-nitro-4-fluoroalkylphenyl sulfones (wherein R 1 for -CH 2 CHFCHF-,R 2 -CH=CHCHF-) accounts for 25% of the total mass of the solvent, fluorodinitrile dialkyl ethers (wherein R 3 for-CF 2 CF 2 -, R 4 for -CH 2 CH 2 CF 2 -) accounts for 35% of the total mass of the solvent, diethyl carbonate accounts for 40% of the total mass of the solvent, the molar concentration of the lithium salt LiF in the non-aqueous solvent is 1.0mol / L, and the lithium salt co-solvent triisopropylidene acetonyl boron The quality of alkane is 3% of the solvent quality, and the negative electrode film-forming additive lithium dioxalate borate is 7% of the solvent quality.

Embodiment 3

[0045] A high-voltage lithium-ion battery electrolyte was prepared in a glove box filled with argon gas with a purity of 99.999%, the moisture in the glove box was controlled at ≤1ppm, and the temperature was room temperature. In the electrolyte of high-voltage lithium-ion batteries, fluoroalkenyl 3-nitro-4-fluoroalkylphenyl sulfones (wherein R 1 for-CHFCF 2 -, R 2 for -CH=CHCF 2 CHF-) accounts for 35% of the total mass of the solvent, and fluorinated dinitrile dialkyl ethers (wherein R 3 for-CHFCHFCH 2 -, R 4 for-CF 2 CHFCHF-) accounts for 25% of the total mass of the solvent, methyl ethyl carbonate accounts for 40% of the total mass of the solvent, lithium salt Li 2 The molar concentration of O in the non-aqueous solvent is 1.8mol / L, the quality of lithium salt cosolvent three (pentafluorophenyl) borane is 8% of solvent quality, and negative electrode film-forming additive lithium dioxalate borate quality is 8% of solvent quality 2%.

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Abstract

The invention discloses an electrolyte for a high-voltage lithium-ion battery. The electrolyte comprises an organic solvent, a lithium salt and a lithium salt cosolvent, wherein the organic solvent comprises a fluoro alkenyl 3-nitryl-4-fluorinated alkyl phenyl sulfone compound and a fluoro-dinitrile dialkyl ether compound. The electrolyte for the high-voltage lithium-ion battery can improve the energy density of the lithium battery, and is good in stability under a high voltage; the service lifetime of the lithium battery can be significantly prolonged; and the safety performance of the lithium battery can be significantly improved.

Description

technical field [0001] The invention relates to a liquid electrolyte for a high-voltage lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have become one of the most promising secondary batteries due to their advantages such as low self-discharge rate, no memory effect, long cycle life, high energy density, high working voltage and environmental friendliness, and are widely used in Various fields in daily life, including notebook computers, mobile phones, digital cameras and other portable electronic devices. However, with the rapid improvement of the performance of various portable devices, people put forward higher requirements for the capacity and energy density of lithium-ion batteries. In addition, with the development of hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV) and pure electric vehicles (EV) in recent years, the energy density of lithium-ion batteries as t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0568H01M10/0569H01M2300/0028Y02E60/10
Inventor 赖延清方静陈巍洪波张治安李劼张凯
Owner 南宁翌思达新能源科技有限公司