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Lithium ion battery flame-retardant electrolyte

A technology of lithium-ion batteries and electrolytes, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor flame retardancy of electrolytes, achieve excellent flame retardancy, ensure cycle performance, and good film-forming properties Effect

Active Publication Date: 2016-10-12
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor flame retardant performance of the electrolyte in the prior art, and provide a flame retardant electrolyte for lithium ion batteries that can effectively improve the flame retardant performance

Method used

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  • Lithium ion battery flame-retardant electrolyte
  • Lithium ion battery flame-retardant electrolyte

Examples

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Effect test

Embodiment 1

[0041] A kind of lithium-ion battery flame-retardant electrolyte, its raw material composition comprises electrolyte lithium salt, organic solvent, fire-retardant additive and film-forming additive, described electrolyte lithium salt is LiPF6, and its concentration in organic solvent is 1mol / L, so The composition of the organic solvent and its volume ratio are: ethylene carbonate 28, dimethyl carbonate 42, methyl ethyl carbonate 30, the flame retardant additive is difluoromethyl ethylene carbonate, and its mass accounts for 8% of the total mass, the film-forming additive is vinylene carbonate, and its mass accounts for 2% of the total mass of the electrolyte.

[0042] During preparation, the electrolyte lithium salt is first dissolved in an organic solvent to form a mixed solution, and then a film-forming additive is added to the mixed solution and stirred evenly to obtain a lithium-ion battery flame-retardant electrolyte.

Embodiment 2

[0044] With embodiment 1, the difference is that,

[0045] The flame retardant additive in the electrolyte is 1,2-difluoroethyl ether (C 4 h 8 f 2 O), its mass accounts for 1% of the total mass of the electrolyte.

Embodiment 3

[0047] With embodiment 1, the difference is that,

[0048] The flame retardant additive in the electrolyte is 1,1,2,2-tetrafluoroethyl ethyl ether (C 4 h 6 f 4 O), whose mass accounts for 20% of the total mass of the electrolyte.

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Abstract

The invention discloses lithium ion battery flame-retardant electrolyte which comprises raw materials of an electrolyte lithium salt, an organic solvent and a flame-retardant additive, wherein the organic solvent is prepared from the following components in parts by volume: 15-40 parts of an organic basic solvent with a high dielectric constant, 5-45 parts of a low-vapor pressure solvent, 10-55 parts of a low-viscosity solvent and 2-35 parts of an indoor temperature ionic liquid; the anion of the indoor temperature ionic liquid is prepared from at least one ion of tetrafluoroborate, hexafluoroborate, trifluoromethanesulfonate, bi-trifluoro sulfonamide and trifluoroacetic acid; the cation of the indoor temperature ionic liquid is ammonium cation; the flame-retardant additive is at least one of fluoroproplylene carbonate, di-fluoroproplylene carbonate, trifluoroproplylene carbonate, fluorobenzene ether, fluoro ether and propyl-2,2,2-trifluoro-ethyl carbonate; the mass of the flame-retardant accounts for 1-20% of the total mass of the electrolyte. By adopting the lithium ion battery flame-retardant electrolyte, not only is the flame-retardant property of the electrolyte remarkably improved, but also the charge and discharge property of a battery is slightly affected.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a flame-retardant electrolyte for lithium-ion batteries, which is suitable for improving the flame-retardant performance of the electrolyte. Background technique [0002] The electrolyte is the only material in the lithium-ion battery that is in contact with the positive electrode, negative electrode, and separator. It plays a vital role in the specific capacity, operating temperature range, cycle efficiency, and safety performance of the battery. The existing lithium-ion battery electrolyte solvents are all composed of carbonate organic solvents, which have a low flash point and will burn in the air when heated or high temperature, bringing great safety hazards to the battery. The development of flame-retardant electrolytes can reduce the flammability of electrolytes, thereby greatly reducing the risk of electrolyte combustion in batteries. [0003] Ch...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 陈果刘立炳惠怀兵冯修成孟仙雅王烨明孙晓芬
Owner DONGFENG COMML VEHICLE CO LTD
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