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High-voltage lithium battery electrolyte

An electrolyte and lithium battery technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve problems that affect the safety of batteries, reduce battery life, increase battery internal pressure, etc., achieve high energy density, improve compatibility performance and long cycle life

Inactive Publication Date: 2017-05-31
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the battery voltage reaches about 4.5V (vs. Li / Li+), it is very easy to cause the electrolyte to undergo an oxidation reaction on the surface of the positive electrode material, and then a large amount of gas will be generated, causing the internal pressure of the battery to increase and the battery to bulge, affecting the battery. It is safe to use and also reduces the service life of the battery

Method used

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Examples

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Effect test

Embodiment 1

[0032] Embodiment 1: at room temperature, ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC) are mixed according to a mass ratio of 1:1:1 in a glove box full of argon, and A phosphazene additive with a mass percentage of 0.5% is added, and lithium hexafluorophosphate (LiPF6) is added to dissolve to a concentration of 1.0 mol / L to prepare an electrolyte.

Embodiment 2

[0033] Embodiment 2: At room temperature, ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC) are mixed according to a mass ratio of 1:1:1 in a glove box full of argon, and A phosphazene additive with a mass percentage of 1% was added, and lithium hexafluorophosphate (LiPF6) was added to dissolve to a concentration of 1.0 mol / L to prepare an electrolyte.

Embodiment 3

[0034] Embodiment 3: at room temperature, ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC) are mixed according to a mass ratio of 1:1:1 in a glove box full of argon, and A phosphazene additive with a mass percentage of 1.5% is added, and lithium hexafluorophosphate (LiPF6) is added to dissolve to a concentration of 1.0 mol / L to prepare an electrolyte.

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Abstract

The invention relates to a high-voltage lithium battery electrolyte. The high-voltage lithium battery electrolyte comprises a non-aqueous organic solvent, a lithium salt, an additive and a negative electrode film forming agent, wherein the negative electrode film forming agent is arbitrary one of or a combination of several kind of vinylene carbonate, vinylethylene carbonate, 1,3-propane sultone or fluoroethylene carbonate. The high-voltage lithium battery electrolyte has an effect of protecting an electrode, the compatibility of the electrolyte and a high-voltage battery material is improved, and the cycle performance of a battery is greatly improved; and meanwhile, the promotion and the application of a high-energy-density lithium ion battery are also convenient, and the high-voltage lithium battery electrolyte has important significance to development of a power battery with high safety, high energy density and long cycle lifetime.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of electric vehicle batteries, in particular to a high-voltage lithium battery electrolyte. [0003] 【Background technique】 [0004] At this stage, lithium batteries, as the power source of electric vehicles, have also become a hot issue of concern. The development of electric vehicle industrialization has put forward higher requirements for the safety, energy density and cycle life of power batteries. Therefore, a lithium battery with high safety, high energy density and long cycle life is currently needed to meet the development needs of electric vehicles. In order to obtain high energy density, in addition to increasing the specific capacity of the battery material, the voltage of the battery cathode material can also be increased. At present, several main high-voltage cathode materials include LiCoPO4 (4.8V), LiNi0.5Mn1.5O4 (4.7V), three Element material LiNi1-xyCoxMnyO (0≤x, y≤1, x+y≤1) and ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 王振峰王海涛饶睦敏
Owner OPTIMUM BATTERY CO LTD
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