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High-voltage lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of deterioration of battery high-temperature cycle performance, improve high-temperature performance and cycle performance, solve severe gas swelling, and suppress side reactions Effect

Active Publication Date: 2013-11-20
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The above-mentioned patent application documents disclose the use of fluorocarbonate such as FEC as a high-voltage additive and solvent. Although it has a certain effect in high-voltage electrolytes, FEC will decompose into VC (vinylene carbonate) under high temperature conditions. Compared with hydrofluoric acid, the presence of hydrofluoric acid will corrode the SEI film on the surface of the negative electrode, resulting in rapid deterioration of the high-temperature cycle performance of the battery

Method used

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Examples

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Effect test

Embodiment 1

[0044] In an argon-filled glove box (moisture 2 HCF 2 CH 2 OCF 2 CF 2 H, adiponitrile, vinylene carbonate, CF 2 HCF 2 CH 2 OCF 2 CF 2 H, the addition of adiponitrile accounts for 1.0%, 3.0%, and 3.0% of the total mass respectively; finally, slowly add lithium hexafluorophosphate, which accounts for 13.5% of the total mass, to the mixed solution, and stir well to obtain the high-voltage lithium of Example 1 of the present invention Ion battery electrolyte.

Embodiment 2

[0046] In a glove box filled with argon (moisture 2 HCF 2 CH 2 OCF 2 CF 2 H, adiponitrile, vinylene carbonate, CF 2 HCF 2 CH 2 OCF 2 CF 2 H, the addition of adiponitrile accounted for 1.0%, 2.0%, 3.0% of the mass respectively; finally, slowly added lithium hexafluorophosphate accounting for 13.5% of the total mass into the mixed solution, and stirred evenly to obtain the high-voltage lithium lithium phosphate of Example 2 of the present invention Ion battery electrolyte.

Embodiment 3

[0048] In a glove box filled with argon (moisture 2 HCF 2 CH 2 OCF 2 CF 2 H, adiponitrile, vinylene carbonate, CF 2 HCF 2 CH 2 OCF 2 CF 2 H, the addition of adiponitrile accounts for 1.0%, 3.0%, and 2.0% of the mass respectively; finally, slowly add lithium hexafluorophosphate accounting for 13.5% of the total mass to the mixed solution, and stir well to obtain the high-voltage lithium phosphate of Example 3 of the present invention Ion battery electrolyte.

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Abstract

The invention specifically relates to a high-voltage lithium ion battery electrolyte, which belongs to the technical field of lithium ion battery electrolytes. The high-voltage lithium ion battery electrolyte provided by the invention comprises a non-aqueous solvent, a lithium salt and an additive, wherein the additive comprises a mixture of a fluoro-ether additive and an alkyl dinitrile additive. A lithium ion battery using the high-voltage lithium ion battery electrolyte has stable cycle performance at normal temperature, no gas generation at a high temperature condition and small changes of internal resistance. A preparation process for the high-voltage lithium ion battery electrolyte is simple and easy to implement and has good market prospects.

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, anode materials with a maximum operating voltage of 4.2V to 5.0V have appeared. The electrolytes of lithium-ion batteries in the prior art are mainly carbonate-based electrolytes based on ethylene carbonate (EC). , when charging and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 丁祥欢朱智聪郭明
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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