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Electrolyte for high-voltage lithium-ion battery and lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in electrolytes, secondary batteries, circuits, etc., can solve the problems of low charging and discharging efficiency of lithium-ion batteries, poor cycle performance, and restrictions on the development of high-voltage lithium-ion batteries, and achieve a good market Prospects, stable cycle performance, and the effect of improving electrochemical performance

Active Publication Date: 2019-01-29
SUZHOU HUAYI NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte of lithium-ion batteries is easy to decompose under high voltage, resulting in low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, which restricts the further development of high-voltage lithium-ion batteries. Therefore, the development of high-voltage batteries suitable for high-voltage cathode materials electrolyte, will be of great significance

Method used

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  • Electrolyte for high-voltage lithium-ion battery and lithium-ion battery

Examples

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Effect test

Embodiment 1

[0016] A lithium ion battery, the lithium ion battery includes a positive electrode sheet, a negative electrode sheet, a lithium ion diaphragm and an electrolyte. This example provides a kind of preparation method of electrolytic solution, specifically as follows: This electrolytic solution comprises 80% solvent, 15% lithium salt, 5% additive, wherein, solvent is made of 35% ethylene carbonate, 10% Ethyl methyl carbonate and 35% methyl fluorobutyl ether are mixed. The additive is a mixture of 2% vinyl ethylene carbonate, 2.5% fluoroethylene carbonate and 0.5% adiponitrile. The lithium salt used here is LiPF 6 , of course the lithium salt here can use LiPF 6 , LiBOB, LiODFB, LiN(CF 3 SO 2 ) 2 A combination of one or more of them, and the feeding concentration of the lithium salt can be controlled at 0.1-1 mol / L.

Embodiment 2

[0018] Preparation of electrolytic solution: the electrolytic solution includes 85% solvent, 12% lithium salt, 3% additive, wherein the solvent is made of 35% ethylene carbonate, 10% ethyl methyl carbonate, 40% methyl Fluorobutyl ether is mixed, and the additive is mixed with 1% vinyl ethylene carbonate, 1.3% fluoroethylene carbonate, and 0.7% adiponitrile. The lithium salt used here is LiN(CF 3 SO 2 ) 2 .

Embodiment 3

[0020] Preparation of electrolytic solution: the electrolytic solution includes 89% solvent, 10% lithium salt, 1% additive, wherein the solvent is made of 40% ethylene carbonate, 9% ethyl methyl carbonate, 40% methyl Fluorobutyl ether is mixed, and the additive is mixed with 0.4% vinyl ethylene carbonate, 0.4% fluoroethylene carbonate, and 0.2% adiponitrile. The lithium salt used here is LiN(CF 3 SO 2 ) 2 .

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Abstract

The invention discloses an electrolyte for a high-voltage lithium ion battery. Total mass of the electrolyte is 100%. The electrolyte is composed of, by mass, 80-89% of solvent, 10-15% of lithium salt and 0.5-5% of additive, the solvent is formed by mixing ethylene carbonate, methyl ethyl carbonate and methyl fluorobutyl ether , and the additive is composed of vinyl ethylene carbonate, fluoroethylene carbonate and adiponitrile. Methyl fluorobutyl ether is added into the solvent, so that the electrolyte does not have flashing points and is high in safety; the lithium ion battery adopting the additive is stable in circulating performance at normal temperature, is free of inflation at high temperature, small in internal resistance change and high in safety and has good high-temperature performance and high-voltage performance.

Description

technical field [0001] The invention relates to an electrolyte solution for a high-voltage lithium ion battery and the lithium ion battery. Background technique [0002] Lithium-ion battery has the advantages of high energy density, high working voltage, large specific capacity, long cycle life, low self-discharge rate, wide working temperature range and environmental protection, making it a popular choice for mobile electronic devices, cameras, notebook computers, etc. Primary energy source for portable devices. However, the rapid development of mobile electronic devices, especially smartphones (lighter and thinner) in recent years, has also put forward higher demands on the energy density of lithium-ion batteries. while LiNiMnO 4 , LiNiCoMnO 2 、LiCoPO 4 Li-ion deintercalation reactions can occur at higher voltages, thus bringing new hope for improving the energy density of Li-ion batteries. However, the electrolyte of lithium-ion batteries is easy to decompose under h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0568H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M2300/004Y02E60/10
Inventor 王小龙
Owner SUZHOU HUAYI NEW ENERGY TECH CO LTD
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