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Lithium salt compound, preparation method thereof and lithium ion battery electrolyte containing lithium salt compound

A technology of lithium-ion batteries and compounds, applied in the field of lithium-ion batteries, can solve the problems of low flame retardancy and conductivity, few types of lithium salts, and difficulty in large-scale preparation, etc., achieve flame-retardant and conductive performance, low cost, and sufficient source of raw materials reliable effect

Pending Publication Date: 2020-09-22
HONGHU YITAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are relatively few types of lithium salts used in electrolytes, fewer of which have both flame retardant and conductive properties, and are not easy to prepare on a large scale

Method used

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  • Lithium salt compound, preparation method thereof and lithium ion battery electrolyte containing lithium salt compound
  • Lithium salt compound, preparation method thereof and lithium ion battery electrolyte containing lithium salt compound
  • Lithium salt compound, preparation method thereof and lithium ion battery electrolyte containing lithium salt compound

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preparation example Construction

[0053] The embodiment of the present invention provides a kind of preparation method of lithium salt compound, comprises the following steps:

[0054] Step S101, adding dialkyl alkylphosphonite into the protic solvent, mixing evenly, then adding alkyl acrylate while stirring and reacting at 0-80°C for 2-10 hours to obtain compound A; wherein, proton The solvent is any one of methanol, ethanol, formic acid, and acetic acid, and the molar ratio of the protic solvent to the dialkyl alkyl phosphinate is 1:1-1:1.2, and the dialkyl alkyl phosphinate to acrylic acid The molar ratio of alkyl ester is 1:1-1:1.2;

[0055] Step S102, add acid solution A to compound A, heat and reflux at 80-120°C for 4-12 hours, add acetone after the reaction is completed, and crystallize to obtain compound B; wherein, acid solution A is concentrated sulfuric acid or strong Acidic cation exchange resin, the molar dosage of acid solution A is 0.5%-5% of the molar dosage of compound A;

[0056] Step S103,...

Embodiment 1

[0074] Preparation of lithium salt compounds:

[0075] Add 408g (3mol) diethyl methylphosphonite and 180g (3mol) glacial acetic acid into a 1L four-neck flask, lower the temperature to 5°C, and add 300g (3mol) acrylic acid dropwise under nitrogen protection and mechanical stirring Ethyl ester, the rate of addition should be maintained at a temperature not exceeding 25°C. After about 1.5 hours of dropping, the temperature was kept at 25°C for 1 hour. After the reaction, the low boilers were evaporated to obtain 592.8g of compound A in the form of a colorless oily liquid. The yield was 95%, and the GC purity was 97%; 592.8g (2.85mol) of compound A was added in a 2L there-necked flask, and then 500g of water and 5g of concentrated sulfuric acid were added, and stirred and heated to reflux at 100°C for 6 hours. Then the water and the generated ethanol were evaporated, cooled to room temperature, 500g of acetone was added, stirred and dispersed, filtered, and the obtained filter ca...

Embodiment 2

[0080] Preparation of lithium salt compounds:

[0081] Add 204g (1.5mol) diethyl methylphosphonite and 90g (1.5mol) glacial acetic acid into a 1L four-necked flask, and add 192g (1.5mol) tert-acrylic acid dropwise under nitrogen protection and mechanical stirring at room temperature. Butyl ester, the dropping rate is maintained at a temperature not exceeding 70°C. After about 1 hour of dropwise addition, the temperature is kept at 75°C for 3 hours. After the reaction, the low boilers are evaporated to obtain 45.6 g of compound A in the form of a colorless oily liquid. The yield of compound A is The yield was 97.6%, and the GC purity was 97.5%. Add 345.6g (1.46mol) of compound A into a 2L three-necked flask, then add 500g of water and 2g of strong acidic cation exchange resin, stir and heat to reflux at 110°C for 4h, Evaporate the water and the ethanol produced, cool to room temperature, filter, recover the resin, add 500g of acetone, stir and disperse, filter, wash the obtaine...

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Abstract

The invention provides a preparation method of a lithium salt compound, which comprises the following steps: adding alkylphosphite dialkyl ester into a protic solvent, uniformly mixing, and adding alkyl acrylate while stirring to react, thereby obtaining a compound A; adding an acid solution A into the compound A, carrying out a heating reflux reaction, adding acetone after the reaction is completed, and crystallizing to obtain a compound B; adding an alcoholic solution and an acid solution B into the compound B for esterification to obtain a compound C; adding an alcoholic solution into the compound C, uniformly stirring, then adding a lithium source, stirring for reaction, and concentrating and crystallizing after the reaction is finished, so as to obtain the lithium salt compound. The invention also provides a lithium ion battery electrolyte containing the lithium salt compound. The lithium salt compound prepared by the method provided by the invention has flame retardance and goodconductivity, and the lithium ion battery electrolyte composed of the lithium salt compound is stable in performance, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium salt compound, a preparation method thereof, and a lithium ion battery electrolyte containing the compound. Background technique [0002] Lithium-ion batteries are widely used in various fields, such as mobile phones, digital cameras, notebook computers, pure electric vehicles, etc. and hybrid electric vehicles. [0003] The liquid electrolyte currently used in lithium-ion batteries generally uses flammable and explosive ethylene carbonate (EC) and dimethyl carbonate (DMC) as the electrolyte solvent, and the corresponding lithium salt is used to form the electrolyte system. However, the high flammability of the electrolyte inside the lithium-ion battery is an important cause of battery safety problems, especially under the conditions of heating or improper use, the internal temperature of the battery rises, and the internal electrode material and electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/30H01M10/0568H01M10/058
CPCC07F9/301H01M10/0568H01M10/058Y02E60/10Y02P70/50
Inventor 王炼张业武赵根根许磊张凯刘沙张孟徐未付旭
Owner HONGHU YITAI TECH CO LTD
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