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Electrolyte of silicon-carbon negative electrode lithium ion battery and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of continuous consumption of electrolyte, deterioration of battery performance, increase of battery internal resistance, etc., to improve battery gas production, reduce battery internal resistance, and suppress thickness increase Effect

Pending Publication Date: 2021-10-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle breakage caused by the volume expansion and contraction of the silicon carbon negative electrode material during the cycle will cause the continuous consumption of the electrolyte, increase the internal resistance of the battery and deteriorate the performance of the battery, but also bring safety hazards. The situation is even more serious under high temperature conditions.

Method used

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  • Electrolyte of silicon-carbon negative electrode lithium ion battery and lithium ion battery
  • Electrolyte of silicon-carbon negative electrode lithium ion battery and lithium ion battery
  • Electrolyte of silicon-carbon negative electrode lithium ion battery and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0026] An electrolyte solution for a silicon-carbon negative electrode lithium-ion battery, comprising an electrolyte lithium salt, a non-aqueous organic solvent, a film-forming additive and a high-temperature-resistant additive, wherein the high-temperature-resistant additive is compound 1, and the structural formula of compound 1 is as follows:

[0027]

[0028] The mass of compound 1 accounts for 0.05% of the total mass of the electrolyte;

[0029] The electrolyte lithium salt is LiPF 6 , LiPF 6 The mass accounts for 12.5% ​​of the total mass of the electrolyte;

[0030] The film-forming additive is vinyl sulfate, and the quality of vinyl sulfate accounts for 2.5% of the total mass of the electrolyte;

[0031] The non-aqueous organic solvent is supplemented to 100%, and the non-aqueous organic solvent is ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC) according to mass ratio EC:EMC:DEC=3:5: 2 mixed to get.

[0032] The preparation of a ...

Embodiment 2

[0044] An electrolyte solution for a silicon-carbon negative electrode lithium-ion battery, comprising electrolyte lithium salt, a non-aqueous organic solvent, a film-forming additive and a high-temperature-resistant additive, wherein the high-temperature-resistant additive is compound 1, and the quality of compound 1 accounts for 2.5% of the total mass of the electrolyte %;

[0045] The electrolyte lithium salt is LiPF 6 , LiPF 6 The mass accounts for 12.5% ​​of the total mass of the electrolyte;

[0046] The film-forming additive is vinyl sulfate, and the quality of vinyl sulfate accounts for 2.5% of the total mass of the electrolyte;

[0047] The non-aqueous organic solvent is supplemented to 100%, and the non-aqueous organic solvent is ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC) according to mass ratio EC:EMC:DEC=3:5: 2 mixed to get.

[0048] To prepare a silicon-carbon negative electrode lithium-ion battery, the steps are the same as...

Embodiment 3

[0050] An electrolyte solution for a silicon-carbon negative electrode lithium-ion battery, comprising an electrolyte lithium salt, a non-aqueous organic solvent, a film-forming additive and a high-temperature-resistant additive, wherein the high-temperature-resistant additive is compound 1, and the quality of compound 1 accounts for 10% of the total mass of the electrolyte %;

[0051] The electrolyte lithium salt is LiPF 6 , LiPF 6 The mass accounts for 12.5% ​​of the total mass of the electrolyte;

[0052] The film-forming additive is vinyl sulfate, and the quality of vinyl sulfate accounts for 2.5% of the total mass of the electrolyte;

[0053] The non-aqueous organic solvent is supplemented to 100%, and the non-aqueous organic solvent is ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC) according to mass ratio EC:EMC:DEC=3:5: 2 mixed to get.

[0054] To prepare a silicon-carbon negative electrode lithium-ion battery, the steps are the same ...

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Abstract

The invention discloses an electrolyte of a silicon-carbon negative electrode lithium ion battery. The electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent, a film-forming additive and a high-temperature-resistant additive, and the high-temperature-resistant additive is N, N, N-trifluoromethyl cyano ester ammonium sulfonate. The invention also discloses a silicon-carbon negative electrode lithium ion battery which comprises the electrolyte. The N, N, N-trifluoromethyl cyano ester ammonium sulfonate is added into the electrolyte so that high-temperature storage gas production of the silicon-carbon negative electrode lithium ion battery can be inhibited, the internal resistance is reduced, and the high-temperature storage capacity retention rate and the high-temperature cycle performance are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte solution of a silicon-carbon negative electrode lithium-ion battery and the lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect, and little environmental pollution. They have been widely used in various consumer electronics and power battery markets. In order to meet the requirements of high cruising range, normal use in high and low temperature environments, fast charging and long service life of electric vehicles, lithium-ion secondary batteries are required to have higher energy density, better high temperature performance and long cycle performance. [0003] At present, one of the most effective ways to increase the energy density of lithium-ion batteries is to use silicon-carbon anode materials...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 赵坤沈剑俞金萍梁大宇王涂亮
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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