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High-voltage lithium-ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of battery cycle performance deterioration, battery performance decline, battery bulging, etc., achieving easy implementation, small change in internal resistance, and improved The effect of cycle life

Inactive Publication Date: 2013-12-18
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the continuous efforts of technicians in recent years, high-voltage positive electrode materials with a maximum operating voltage of 4.35V to 5.0V have appeared. The electrolytes of lithium-ion batteries in the prior art are mainly carbonate-based materials based on ethylene carbonate (EC). When the electrolyte is charged and discharged in this high-voltage range, it will oxidize and decompose, resulting in rapid deterioration of battery cycle performance and severe battery swelling, resulting in a decline in the performance of the entire battery

Method used

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  • High-voltage lithium-ion battery electrolyte
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  • High-voltage lithium-ion battery electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0045] In an argon-filled glove box (moisture 2 HCF 2 CH 2 OCF 2 CF 2 H, ethoxy pentafluorocyclotriphosphazene and 1,3-propene sultone account for 0.5%, 3.0%, 3.0%, and 0.5% of the total mass respectively; 13.5% lithium hexafluorophosphate, after being stirred evenly, the lithium-ion battery electrolyte of Example 1 was obtained.

Embodiment 2

[0047] In an argon-filled glove box (moisture 2 HCF 2 CH 2 OCF 2 CF 2 H, Ethoxypentafluorocyclotriphosphazene, 1,3-propene sultone, the addition amount accounted for 1.0%, 2.0%, 3.0%, 1.0% of the medium mass respectively; finally slowly added to the mixed solution accounting for the total Lithium hexafluorophosphate with a mass of 13.5% was stirred evenly to obtain the lithium ion battery electrolyte of Example 2.

Embodiment 3

[0049] In a glove box filled with argon (moisture 2 HCF 2 CH 2 OCF 2 CF 2 H, ethoxypentafluorocyclotriphosphazene, 1,3-propene sultone, the addition amount accounted for 2.5%, 3.0%, 2.0%, 2.0% of the medium mass respectively; finally slowly added to the mixed solution accounting for the total Lithium hexafluorophosphate with a mass of 13.5% was stirred evenly to obtain the lithium ion battery electrolyte of Example 3.

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Abstract

The invention belongs to the technical field of lithium-ion battery electrolytes, and particularly relates to a high-voltage lithium-ion battery electrolyte. The high-voltage lithium-ion battery electrolyte comprises non-aqueous solvents, lithium salt and additives, wherein the additives comprise the mixture of fluoro phosphonitrile, fluoro-ether and unsaturated olefinic sultone. A lithium-ion battery using the high-voltage lithium-ion battery electrolyte is long in cycle life under the high voltage and small in internal resistance change. The high-voltage lithium-ion battery electrolyte is simple in preparing technique, easy to realize, and broad in market prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolyte, and in particular relates to a high-voltage lithium-ion battery electrolyte. Background technique [0002] In recent years, electronic devices such as smart phones and tablet computers have greatly changed people's daily life. With the diversification of functions of smart electronic devices, consumers have higher and higher requirements for the capacity of devices' batteries. [0003] One way to improve the battery capacity is to adjust the microstructure of the positive and negative electrode materials of the battery to increase the charging and discharging voltage of the battery. Due to the continuous efforts of technicians in recent years, high-voltage positive electrode materials with a maximum operating voltage of 4.35V to 5.0V have appeared. The electrolytes of lithium-ion batteries in the prior art are mainly carbonate-based materials based on ethylene carbonate (E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/10
Inventor 朱智聪丁祥欢郭明
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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