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Battery electrolyte, preparation method thereof, and silicon negative electrode battery contain same

An electrolyte and battery technology, applied in the direction of secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of unfavorable lithium ion conduction, SEI film thickness, poor low temperature performance of batteries, etc., to improve lithium ion conductivity, eliminate Polarization, effects of improving cycle performance and rate performance

Inactive Publication Date: 2019-01-25
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used electrolyte additive is FEC, the effect needs to be further improved, and the SEI film formed by FEC additive is very thick, which is not conducive to the conduction of lithium ions, and the low temperature performance of the battery is poor

Method used

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  • Battery electrolyte, preparation method thereof, and silicon negative electrode battery contain same
  • Battery electrolyte, preparation method thereof, and silicon negative electrode battery contain same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A functional electrolyte for a silicon negative electrode battery, said functional electrolyte comprising lithium salt, an organic solvent and a functional additive; wherein the functional additive is FEC and 4-chloromethyl-1,3,2-dioxathiolane -2-oxide.

[0024] The preparation method of the silicon negative electrode battery functional electrolyte is as follows: mixing an organic solvent and a lithium salt and stirring evenly to obtain an initial mixed electrolyte; adding functional additives to the initial mixed electrolyte and stirring evenly to obtain a functional electrolyte.

Embodiment 2

[0026] mixing the organic solvent and the lithium salt and stirring evenly to obtain an initial mixed electrolyte; adding functional additives to the initial mixed electrolyte and stirring evenly to obtain a functional electrolyte;

[0027] Among them, the functional additives are FEC and 4-chloromethyl-1,3,2-dioxathiolane-2-oxide; the volume percentages of FEC and functional additives in the functional electrolyte are 2% and 3%, respectively.

[0028] The lithium salt is LiN( CF 3 SO 2 ) 2 ; The concentration of lithium salt in the initial mixed electrolyte is 1mol / L;

[0029] The organic solvent is a mixed solution of ethylene carbonate and ethylene glycol dimethyl ether, and the volume ratio of the two is 1:1.

Embodiment 3

[0031] mixing the organic solvent and the lithium salt and stirring evenly to obtain an initial mixed electrolyte; adding functional additives to the initial mixed electrolyte and stirring evenly to obtain a functional electrolyte;

[0032] Among them, the functional additives are FEC and 4-chloromethyl-1,3,2-dioxathiolane-2-oxide; the volume percentages of FEC and functional additives in the functional electrolyte are 1% and 2%, respectively.

[0033] The lithium salt is LiN(FSO 2 ) 2 and LiN( CF 3 SO 2 ) 2 and the molar ratio of the two is 1:1; the concentration of the lithium salt in the initial mixed electrolyte is 0.5mol / L;

[0034] The organic solvent is a mixture of fluoroethylene carbonate, propylene carbonate and ethylene glycol diethyl ether, and the volume ratio of the three is 1:1.

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Abstract

The invention discloses a battery electrolyte, a preparation method and a silicon negative electrode battery containing the electrolyte, wherein the electrolyte comprises a lithium salt, an organic solvent and a functional additive, wherein the functional additive is vinyl fluorocarbonate and 4-Methyl chloride-1, 3, 2-Dioxathiolane-2-Oxide. The invention adds functional additives vinyl fluorocarbonate and 4-Methyl chloride-1, 3, 2-Dioxathiolane-2-Oxides can form thinner and more stable solid electrolyte phase interface on the surface of silicon anode through electrochemical process or chemicalprocess. The combination of the two additives can improve the lithium ion conductivity of SEI film and improve the cycle performance and rate performance of the battery, especially the low temperature performance of the battery.

Description

technical field [0001] The invention relates to the technical field of battery electrolyte, in particular to a battery electrolyte, a preparation method and a silicon negative electrode battery containing the electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, small self-discharge, wide operating voltage range, no memory effect, long service life, and no environmental pollution. They have been widely used in electronic products, electric vehicles and energy storage fields. At present, the application of negative electrode materials is mainly Traditional graphite materials are the main materials, but the specific capacity of graphite is close to the theoretical value of 372mAh / g, and there is little room for improvement, which limits the energy density of lithium-ion batteries, making it difficult to meet the increasing energy density requirements. [0003] At present, new silicon anode materials have been gradually app...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 谢李生杨立铭谢李昭杨续来
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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