Preparation method of electrolyte used for lithium manganate power battery at high temperature

A power battery and electrolyte technology, which is applied in the field of preparation of high-temperature electrolyte for lithium manganate power batteries, can solve the problems of poor cycle performance of lithium manganate batteries, loss of activity of the positive electrode, and low manganese dissolution, etc., to improve the high-temperature cycle Performance, improved safety, reduced dissolution effects

Inactive Publication Date: 2014-04-09
JIANGXI YOULI NEW MATERIALS
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dissolution of manganese at normal temperature is not large, and the dissolution of manganese doubles at high temperature. An important reason is that the reaction of water to produce acid is accelerated at high temperature, so that the positive electrode loses its activity, resulting in poor cycle performance of lithium manganate batteries.

Method used

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  • Preparation method of electrolyte used for lithium manganate power battery at high temperature
  • Preparation method of electrolyte used for lithium manganate power battery at high temperature

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preparation example Construction

[0018] The preparation method of this specific embodiment is as follows: at room temperature, weigh film-forming additives, non-aqueous organic solvents, high-temperature additives, anti-overfilling additives, flame-retardant additives, stabilizers, and lithium salts in a glove box filled with argon; Pour the above-mentioned various raw materials into a beaker and place it on a magnetic stirrer, control the stirring rate until the lithium salt is completely dissolved, and mix various solvents evenly to obtain a non-aqueous electrolyte.

[0019] In this specific embodiment, by adding a film-forming additive with excellent performance, the performance of the solid phase interface film (SEI) is improved, and at the same time, a film can be formed on the surface of the positive electrode, which greatly reduces the dissolution of the material and is conducive to improving the high-temperature cycle performance of the battery; adding The anti-overcharge additive can prevent the batte...

Embodiment 1

[0021] Example 1: At room temperature, weigh 25.05 g of ethylene carbonate (EC), 8.35 g of ethyl methyl carbonate (EMC), 41.75 g of diethyl carbonate (DEC), and propylene carbonate ( PC) 8.35g, ethylene carbonate (VEC) 0.5g, methylene disulfonate (MMDS) 1.0g, biphenyl 1.0g, dimethyl methyl phosphate (DMMP) 2.0g, hexamethyl disulfonate Silamine 0.001g, lithium bisoxalate borate (LiBOB) 2g and lithium hexafluorophosphate (LiPF 6 ) 10g; then pour the above-mentioned various raw materials into a beaker and place it on a magnetic stirrer, control the stirring rate until the lithium salt is completely dissolved, and mix various solvents evenly to obtain 100g of non-aqueous electrolyte.

[0022] Using spinel lithium manganese oxide as the positive electrode, metal lithium sheet as the negative electrode, Celgard2300 microporous polypropylene membrane as the diaphragm, and the prepared sample as the electrolyte, it was assembled in a glove box with a relative humidity of less than 5% ...

Embodiment 2

[0024] Example 2: At room temperature, weigh 25.05 g of ethylene carbonate (EC), 8.35 g of dimethyl carbonate (DMC), 41.75 g of diethyl carbonate (DEC), and propylene carbonate ( PC) 8.35g, ethylene carbonate (VEC) 0.5g, methylene disulfonate (MMDS) 1.0g, biphenyl 1.0g, dimethyl methyl phosphate (DMMP) 2.0g, hexamethyl disulfonate Silamine 0.001g, lithium bisoxalate borate (LiBOB) 2g and lithium hexafluorophosphate (LiPF 6) 10g; then pour the above-mentioned various raw materials into a beaker and place it on a magnetic stirrer, control the stirring rate until the lithium salt is completely dissolved, and mix various solvents evenly to obtain 100g of non-aqueous electrolyte.

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Abstract

The invention provides a preparation method of an electrolyte used for a lithium manganate power battery at a high temperature, and relates to the technical field of lithium manganate power batteries. The components in the formula of the electrolyte comprise a non-aqueous organic solvent, a lithium salt, a high temperature additive, 0.1-5% by mass of a film forming additive, 0.1-10% by mass of a fire retardation additive, 0.1-10% by mass of an overcharge-preventing additive and 0.001-1% by mass of a stabilizer. The preparation method comprises: at a room temperature, weighing a film forming additive, a non-aqueous organic solvent, a high temperature additive, an overcharge-preventing additive, a fire retardation additive, a stabilizer and a lithium salt in a glove box filled with argon, pouring the raw materials into a beaker, placing on a magnetic stirrer, controlling the stirring rate until completely dissolving the lithium salt, and uniformly mixing various solvents so as to obtain the non-aqueous electrolyte, wherein the non-aqueous electrolyte has excellent high temperature cycle performance and excellent safety.

Description

technical field [0001] The invention relates to the technical field of lithium manganate power batteries, in particular to a method for preparing a high-temperature electrolyte for lithium manganate power batteries. Background technique [0002] The rapid development of the automobile industry has also exacerbated the crisis of energy and environment. According to statistics, 63% of air pollution comes from fuel vehicles, which has prompted the country to increase research and development of electric vehicles and hybrid vehicles. In recent years, due to the relatively high energy density and long cycle life of lithium-ion secondary batteries, they are widely used in various portable electronic products and communication tools, and also have important applications in electric vehicles and energy storage equipment. prospect. At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide and nickel-cobalt-m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/058Y02E60/10
Inventor 王任衡王超颜果春齐爱
Owner JIANGXI YOULI NEW MATERIALS
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