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Flame-retardant electrolyte for lithium ion battery and preparation method thereof

A lithium ion battery and electrolyte technology, which is applied to the field of flame retardant electrolyte for lithium ion battery and its preparation, can solve the problems of poor compatibility of negative electrode, destruction of electrochemical performance of battery with flame retardant performance of electrolyte, reduction of flammability of electrolyte, etc. , to achieve the effect of good conductivity, good electrochemical stability, reducing flammability and explosiveness

Inactive Publication Date: 2018-06-19
广州鸿森材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of organophosphorus compounds is poorly compatible with graphite carbon anodes, and the reduction in the flammability of the electrolyte usually requires the sacrifice of battery performance.
[0004] In the prior art, the electrolyte cannot satisfy the flame retardant performance of the electrolyte and overcome its damage to the electrochemical performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The flame-retardant electrolyte solution for lithium-ion batteries in this embodiment includes the following raw materials in parts by weight: 2 parts of adiponitrile, 2 parts of dimethylacetamide, 5 parts of lithium diacetate borate, 3 parts of sodium sulfite, 10 parts of propylene carbonate, 5 parts of trimethyl phosphite, 10 parts of lithium salt, 3 parts of film forming agent, 5 parts of flame retardant;

[0022] Wherein, the film-forming agent is fluorovinyl ester; the flame retardant is tris(2,2,2-trifluoroethyl) phosphite;

[0023] The preparation method of the flame retardant electrolyte for the lithium ion battery of this embodiment comprises the following steps:

[0024] S1, weigh each raw material, set aside;

[0025] S2. Under an argon atmosphere, add adiponitrile, dimethylacetamide, lithium diacetate borate, sodium sulfite, trimethyl phosphite, film forming agent, flame retardant, Lithium salt, stir evenly.

Embodiment 2

[0027] The flame-retardant electrolyte solution for lithium ion batteries in this embodiment includes the following raw materials in parts by weight: 8 parts of adiponitrile, 7 parts of dimethylacetamide, 10 parts of lithium diacetate borate, 8 parts of sodium sulfite, 25 parts of propylene carbonate, 10 parts of trimethyl phosphite, 18 parts of lithium salt, 10 parts of film forming agent, 10 parts of flame retardant;

[0028] Wherein, the film forming agent is vinyl chloride; the flame retardant is bis(2,2,2-trifluoroethyl) methyl phosphate;

[0029] The preparation method of the flame retardant electrolyte for the lithium ion battery of this embodiment comprises the following steps:

[0030] S1, weigh each raw material, set aside;

[0031] S2. Under a nitrogen atmosphere, add adiponitrile, dimethylacetamide, lithium diacetate borate, sodium sulfite, trimethyl phosphite, film forming agent, flame retardant, lithium salt, stir well and serve.

Embodiment 3

[0033] The flame-retardant electrolyte solution for lithium-ion batteries in this embodiment includes the following raw materials in parts by weight: 5 parts of adiponitrile, 4 parts of dimethylacetamide, 7 parts of lithium diacetate borate, 5 parts of sodium sulfite, 18 parts of propylene carbonate, 8 parts of trimethyl phosphite, 14 parts of lithium salt, 6.5 parts of film former, 7.5 parts of flame retardant;

[0034] Among them, the film-forming agent is propane sultone; the flame retardant is tris(2,2,2-trifluoroethyl)phosphite, bis(2,2,2-trifluoroethyl)methyl phosphate , trichloroalkyl phosphate, trimethyl phosphorous acid mixed;

[0035] The preparation method of the flame retardant electrolyte for the lithium ion battery of this embodiment comprises the following steps:

[0036] S1, weigh each raw material, set aside;

[0037] S2. Under an argon atmosphere, add adiponitrile, dimethylacetamide, lithium diacetate borate, sodium sulfite, trimethyl phosphite, film formin...

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Abstract

The invention provides a flame-retardant electrolyte for a lithium ion battery and a preparation method thereof, and relates to the technical field of an electrolyte for the lithium ion battery. The flame-retardant electrolyte for the lithium ion battery is prepared from the following raw materials of adiponitrile, dimethylacetamide, diacetic acid lithium borate, sodium sulfite, propylene carbonate, trimethyl phosphite, lithium salt, a filming agent, and a flame-retardant agent. The flame-retardant electrolyte for the lithium ion battery has the advantages that the burning and firing are avoided, and the safety of the lithium ion battery is effectively improved; the heat stability is obviously improved, and the discoloring and precipitate separation-out of the electrolyte are avoided whenthe electrolyte is stored for five months or more at the temperature of 50 DEG C. The lithium ion battery prepared by the electrolyte has the advantages that the flame-retardant property is good, thecyclic property is good, and the electric conductivity is good.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a flame-retardant electrolyte for lithium-ion batteries and a preparation method thereof. Background technique [0002] Due to the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, lithium-ion batteries have extremely important applications in the fields of electronic products, electric vehicles, aerospace, and energy storage. However, in recent years, reports about fires and even explosions caused by lithium-ion batteries have become common. The safety of lithium-ion batteries has attracted people's attention, and at the same time, safety issues have become a bottleneck restricting the development of lithium-ion batteries in the direction of large-scale and high-energy. The most important components of a lithium-ion battery are the positive and negative electrode materials and the electrolyte. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0566H01M10/0567H01M2300/0025Y02E60/10
Inventor 刘振添孙斌王英洪魁明
Owner 广州鸿森材料有限公司
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