Electrolyte capable of suppressing gas production of lithium ion batteries

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as no solution, achieve the effects of reducing gas production, increasing safety, and improving industrial production capacity

Inactive Publication Date: 2019-02-22
福建冠城瑞闽新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Electrolyte capable of suppressing gas production of lithium ion batteries

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Embodiment 1

[0029] Lithium-ion battery electrolyte is composed of: lithium tetrafluoroborate with a concentration of 0.5mol / L and lithium bisfluorosulfonyl imide at a concentration of 0.9mol / L as lithium salt, and propylene carbonate, ethylene carbonate, butylene carbonate, The mixture of ethyl methyl carbonate, dimethyl carbonate and diethyl carbonate (weight ratio is 10:60:4:11:10:5) is an organic solvent, and the weight of the additive is 2% of the total weight of the lithium salt and the organic solvent , The additive consists of lithium difluorooxalate borate, 1,3-propane sultone, ethylene carbonate and fluoroethylene carbonate in a weight ratio of 1:1:0.6:1.5.

Embodiment 2

[0031] Lithium-ion battery electrolyte consists of: lithium tetrafluoroborate with a concentration of 0.9mol / L and lithium bisfluorosulfonyl imide at a concentration of 0.6mol / L as lithium salts, and propylene carbonate, ethylene carbonate, butylene carbonate, The mixture of ethyl methyl carbonate and diethyl carbonate (weight ratio is 10:50:5:11:6) is an organic solvent, and the weight of the additive is 2.5% of the total weight of the lithium salt and the organic solvent, and the additive consists of difluorooxalate boric acid Lithium, 1,3-propane sultone, ethylene carbonate and fluoroethylene carbonate are composed in a weight ratio of 1:0.8:0.8:1.8.

Embodiment 3

[0033] Lithium-ion battery electrolyte is composed of lithium tetrafluoroborate with a concentration of 0.7mol / L and lithium bisfluorosulfonyl imide at a concentration of 0.8mol / L as lithium salt, and propylene carbonate, ethylene carbonate, butylene carbonate, The mixture of di-n-butyl carbonate and diethyl carbonate (weight ratio is 10:48:15:12:5) is an organic solvent, and the weight of the additive is 2% of the total weight of the lithium salt and the organic solvent, and the additive consists of difluorooxalic acid Lithium borate, 1,3-propane sultone, ethylene carbonate and fluoroethylene carbonate are composed in a weight ratio of 1:1.2:0.3:1.3.

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Abstract

The invention relates to the field of lithium ion batteries, in particular to an electrolyte capable of suppressing gas production of lithium ion batteries. The electrolyte comprises lithium salt, organic solvents and additives; the lithium salt is selected from one or multiple of lithium hexafluoroarsenate, lithium tetrafluoroborate, lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide, and the concentration of the lithium salt substance ranges from 0.5 mol/L to 2.0 mol/L; the additives are selected from one or multiple of lithium difluoroborate, tetrafluoroethylene oxalic acid phosphate lithium,1,3-propane suhone, DTD, vinylethylene carbonate, propylene sulfite, 1,4-butane sultone, tris(trimethylsilyl) phosphate, fluoroethylene carbonate and lithium difluorophosphate, and theusage of the additives is equal to 2-2.5% of the total mass of the lithium salt and the organic solvents. The electrolyte is used for preparation of the lithium ion batteries, can suppress gas production rate of the lithium ion batteries during precharging, and accordingly improves production efficiency of the lithium ion batteries and performance thereof.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte for suppressing gas production of lithium ion batteries. Background technique [0002] Lithium-ion batteries are the hottest new energy in the field of new energy, and have been widely used in the field of power and energy storage. While satisfying performance indicators such as high energy density, long cycle life, and high safety, how to improve the convenience and rhythm of its manufacturing process (especially the problem of gas production) has always been a matter of great concern to the industry. [0003] Graphite materials are the most common anode materials for lithium-ion batteries. At present, amorphous carbon coating treatment is generally performed on the surface of anode materials to reduce impedance, so as to improve the battery's ground temperature performance and rate charge and discharge performance. During the first charging process...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 王磊杨允杰赵家兴王浩然陈曦
Owner 福建冠城瑞闽新能源科技有限公司
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