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Preparation method of organic flame-retardant electrolyte for lithium ion batteries

A technology for lithium-ion batteries and electrolytes, which is applied in the field of preparation of organic flame-retardant electrolytes for lithium-ion batteries, and can solve the problems of reducing the migration number of lithium ions in the electrolyte and low conductivity of the electrolyte

Inactive Publication Date: 2020-07-10
金华速览技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The flame retardant electrolytes prepared by the above inventions and prior art all use dimethyl phosphonate, triethyl phosphate, triethoxyphosphazene-N-diethyl phosphate, tris(trifluoroethyl)phosphoric acid Flame retardants such as esters and bis(2,2,2-trifluoroethyl)ethylphosphonate are added to the electrolyte to achieve the purpose of flame retardancy, but these additives will reduce the concentration of lithium ions in the electrolyte to a certain extent. migration number, leading to low conductivity of the electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of an organic flame-retardant electrolyte for a lithium-ion battery, the specific scheme of which is as follows:

[0023] According to the number of parts by mass, stir and mix 100g fluorine-containing polyether flame retardant solvent, 20g ethylene carbonate and 10g diluent evenly, then add 20g4A molecular sieve into the mixture, leave it for 24h after mixing, then remove the molecular sieve, and dry it in anhydrous Add 1g of electrolyte conductivity aid and 5g of lithium salt to the mixture in an oxygen environment, stir at room temperature for 5 hours, mix evenly, seal and store, and store for 3 hours to obtain the organic flame-retardant electrolyte for lithium-ion batteries.

[0024] The preparation method of described fluorine-containing polyether flame retardant solvent is as follows:

[0025] Under a dry nitrogen atmosphere, add 4g of sodium borohydride into 150g of tetrahydrofuran according to the number of parts by mass, stir and mix evenl...

Embodiment 2

[0034] A preparation method of an organic flame-retardant electrolyte for a lithium-ion battery, the specific scheme of which is as follows:

[0035] According to the number of parts by mass, stir and mix 140g fluorine-containing polyether flame retardant solvent, 25g ethylene carbonate and 20g diluent evenly, then add 30g4A molecular sieve into the mixture, leave it for 36h after mixing, then remove the molecular sieve, and dry it in anhydrous Add 4g of electrolyte conductivity aid and 8g of lithium salt to the mixture in an oxygen environment, stir at room temperature for 6 hours, mix evenly, seal and store, and store for 4 hours to obtain the organic flame-retardant electrolyte for lithium-ion batteries.

[0036] The preparation method of described fluorine-containing polyether flame retardant solvent is as follows:

[0037]Under a dry nitrogen atmosphere, add 7g of sodium borohydride into 190g of tetrahydrofuran according to the number of parts by mass, stir and mix evenly...

Embodiment 3

[0046] A preparation method of an organic flame-retardant electrolyte for a lithium-ion battery, the specific scheme of which is as follows:

[0047] According to the number of parts by mass, stir and mix 180g fluorine-containing polyether flame retardant solvent, 30g ethylene carbonate and 30g diluent evenly, then add 50g4A molecular sieve into the mixture, leave it for 48h after mixing, then remove the molecular sieve, and dry it in anhydrous Add 8g of electrolyte conductivity aid and 12g of lithium salt to the mixture in an oxygen environment, stir at room temperature for 8 hours, mix evenly, seal and store, and store for 6 hours to obtain the organic flame-retardant electrolyte for lithium-ion batteries.

[0048] The preparation method of described fluorine-containing polyether flame retardant solvent is as follows:

[0049] Under dry nitrogen atmosphere, add 10g of sodium borohydride into 260g of tetrahydrofuran according to the number of parts by mass, stir and mix evenl...

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Abstract

The invention relates to the field of new energy, in particular to a preparation method of an organic flame-retardant electrolyte for lithium ion batteries. The electrolyte is prepared by mixing a fluorine-containing polyether flame-retardant solvent, ethylene carbonate, a diluent and a lithium salt. The invention provides an organic flame-retardant electrolyte for lithium ion batteries. The maincomponent of the electrolyte is a fluorine-containing polyether flame-retardant solvent. The solvent is composed of methyl carbonate terminated perfluoropolyether generated by reacting terminally hydroxylated perfluoropolyether with methyl 4-chloroformylbutyrate. Due to electron delocalization caused by fluorine-containing functional groups in the structure, the nucleophilicity of oxygen atoms inthe electrolyte is reduced, the bonding strength between the electrolyte and lithium ions is reduced, and migration of cations in a medium is promoted. An electrolyte conductivity additive is added, so that the conductivity of the electrolyte can be further improved. The electrolyte disclosed by the invention has the advantages of flame retardance, low viscosity, high conductivity and low electrochemical polarization.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a method for preparing an organic flame-retardant electrolyte for a lithium-ion battery. Background technique [0002] Due to the high specific energy of lithium batteries and poor material stability, the current commercial lithium batteries use organic electrolytes, which are extremely easy to burn, so safety problems are prone to occur. Safety issues have become an important obstacle restricting the development of lithium-ion batteries. [0003] 201910247215.6 involves a fluorine-containing flame-retardant non-aqueous electrolyte. The fluorine-containing flame-retardant non-aqueous electrolyte comprises, in parts by weight: 2-15 parts of lithium salt, 10-50 parts of non-aqueous solvent, 20-60 parts of diluent, and 2-20 parts of flame retardant. On the basis of using fluorine-containing flame retardants, the invention further uses fluorine-containing ether diluents, so that the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/058H01M10/0525H01M10/42C09K21/14
CPCC09K21/14H01M10/0525H01M10/0567H01M10/0569H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 不公告发明人
Owner 金华速览技术开发有限公司
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