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Lithium ion battery electrolyte suitably used for silicon-carbon negative electrode

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of volume expansion, rapid battery capacity decay, poor cycle life and other problems, to improve performance, improve high-temperature cycle and storage performance, The effect of suppressing side effects

Inactive Publication Date: 2016-04-06
WANXIANG 123 CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a silicon-carbon negative electrode that satisfies the shortcomings of the existing conventional silicon-carbon negative electrode battery, such as volume expansion and electrode sheet pulverization during the battery cycle, resulting in rapid battery capacity decay and poor cycle life. Battery cycle stability and good high-temperature performance, while taking into account the high-temperature performance of the battery, to meet the application requirements of high-density batteries, lithium-ion battery electrolyte suitable for silicon-based negative electrodes

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] Organic solvents: ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and fluoroethylene carbonate, lithium salts: lithium hexafluorophosphate and lithium difluorooxalate borate, additives: tris(pentafluorophenyl)borane, hexamethyl Silazane and succinonitrile are uniformly mixed according to the proportion to obtain the lithium ion battery electrolyte suitable for silicon-based negative electrodes of the present invention, wherein, ethylene carbonate: ethyl methyl carbonate: dimethyl carbonate: fluoroethylene carbonate The volume ratio is 3:5:1:1, the molar concentration of lithium hexafluorophosphate is 0.9mol / L, the molar concentration of lithium difluorooxalate lithium borate is 0.1mol / L, and the additive tris(pentafluorophenyl)borane accounts for 1% of the total mass of the electrolyte. 2.0%, hexamethylsilazane accounts for 0.1% of the total mass of the electrolyte, and succinonitrile accounts for 0.5% of the total mass of the electrolyte.

Embodiment 2

[0019] Organic solvents: propylene carbonate, ethyl methyl carbonate, diethyl carbonate and fluoroethylene carbonate, lithium salts: lithium hexafluorophosphate and lithium difluorooxalate borate, additives: tris(pentafluorophenyl)borane, hexamethyl Silazane and succinonitrile are uniformly mixed according to the proportion to obtain the lithium ion battery electrolyte suitable for silicon-based negative electrodes of the present invention, wherein, propylene carbonate: ethyl methyl carbonate: dimethyl carbonate: fluoroethylene carbonate The volume ratio is 2.5:5:1:1.5, the molar concentration of lithium hexafluorophosphate is 1.0mol / L, the molar concentration of lithium difluorooxalate lithium borate is 0.1mol / L, and the additive tris(pentafluorophenyl)borane accounts for 1% of the total mass of the electrolyte. 1.5%, hexamethylsilazane accounts for 0.2% of the total mass of the electrolyte, and succinonitrile accounts for 1% of the total mass of the electrolyte.

Embodiment 3

[0021] Organic solvents: ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and fluoroethylene carbonate, lithium salts: lithium hexafluorophosphate and lithium difluorooxalate borate, additives: tris(pentafluorophenyl)borane, hexamethyl Silazane and succinonitrile are uniformly mixed according to the proportion to obtain the lithium ion battery electrolyte suitable for silicon-based negative electrodes of the present invention, wherein, propylene carbonate: ethyl methyl carbonate: dimethyl carbonate: fluoroethylene carbonate The volume ratio is 2:5:1:1.5, the molar concentration of lithium hexafluorophosphate is 1.2mol / L, the molar concentration of lithium difluorooxalate lithium borate is 0.1mol / L, and the additive tris(pentafluorophenyl)borane accounts for 1% of the total mass of the electrolyte. 1%, hexamethylsilazane accounts for 0.5% of the total mass of the electrolyte, and succinonitrile accounts for 1.5% of the total mass of the electrolyte.

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Abstract

The invention discloses a lithium ion battery electrolyte suitably used for a silicon-carbon negative electrode. The electrolyte comprises an electrolyte lithium salt, an organic solvent and a functional additive, wherein the lithium salt is a mixture of lithium hexafluorophate and lithium difluoroborate, the organic solvent is a mixture of a carbonic ester solvent and a fluoro-solvent, the proportion of the carbonic ester solvent to the fluoro-solvent is (8.5-9):(1.5-1), and the functional additive comprises an SEI modifier, a hydrogen fluoride (HF) acid absorbent and a positive electrode film-forming agent. By reasonable combination of the constituents of the lithium salt, the organic solvent and the functional additive, the cycle stability and the high-temperature performance of the silicon-carbon negative electrode are satisfied.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte suitable for silicon-carbon negative electrodes. Background technique [0002] As a new generation of green energy products, lithium-ion batteries are developing rapidly, and have a wide range of applications and markets in new energy industries such as 3C products, energy storage, and electric vehicles. With the development of lithium-ion batteries, high energy density will be the key to future lithium development. the trend of. At present, the existing negative electrode materials of lithium-ion batteries are mainly graphite, and the maximum theoretical specific capacity of graphite is only 372mAh / g. , The energy density of the battery is limited, and the pursuit of higher energy density requires a positive and negative electrode material system with a higher capacity. The theoretical gram capacity of a pure silicon-based negati...

Claims

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Application Information

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IPC IPC(8): H01M10/056
CPCY02E60/10
Inventor 严红石先兴
Owner WANXIANG 123 CO LTD
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