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Preparation method of organic electrolyte capable of improving heat stability of lithium-ion battery

A lithium-ion battery and organic electrolyte technology, which is applied in the field of organic electrolyte preparation, can solve the problems of flammability and explosion of lithium-ion battery electrolyte, and achieve the benefits of storage and service life, increased stability, and improved safety performance Effect

Inactive Publication Date: 2016-01-27
SHANDONG HONGZHENG BATTERY MATERIAL TECH
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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 solve the problem that the lithium-ion battery electrolyte is flammable and explosive when heated, and to provide a method for preparing an organic electrolyte that can improve the thermal stability of the lithium-ion battery

Method used

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  • Preparation method of organic electrolyte capable of improving heat stability of lithium-ion battery
  • Preparation method of organic electrolyte capable of improving heat stability of lithium-ion battery
  • Preparation method of organic electrolyte capable of improving heat stability of lithium-ion battery

Examples

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Effect test

Embodiment 1

[0025] A preparation method of an organic electrolyte capable of improving thermal stability of lithium-ion batteries, comprising the following steps:

[0026] 1) Remove impurities and purify EC, BC and DME organic solvents at room temperature and mix them in an equal mass ratio to obtain a mixed solvent.

[0027] 2) Stir the mixed solvent continuously and add lithium salt LiPF6 to obtain an electrolyte solution without additives; the molar concentration range of lithium salt in the electrolyte solution is 0.8mol / L.

[0028] 3) the flame retardant additive

[0029]

[0030] Adding it into the above-mentioned electrolyte solution without additives can obtain a lithium-ion battery electrolyte solution with better thermal stability, wherein the mass of the flame retardant additive is 0.5% of the mass of the solvent.

Embodiment 2

[0032] A preparation method of an organic electrolyte capable of improving thermal stability of lithium-ion batteries, comprising the following steps:

[0033] 1) Remove impurities and purify EC, MPC and EMC organic solvents at room temperature and mix them in equal mass ratios to obtain a mixed solvent.

[0034] 2) Stir the mixed solvent continuously and add lithium salt LiPF 6 , to obtain an additive-free electrolyte; the molar concentration range of the lithium salt in the electrolyte is 1mol / L.

[0035] 3) the flame retardant additive

[0036]

[0037] Adding it to the above-mentioned electrolyte solution without additives can obtain a lithium-ion battery electrolyte solution with better thermal stability, wherein the mass of the flame retardant additive is 1% of the mass of the solvent. Further, other functional additives vinylene carbonate (VC) and biphenyl (BP) are added to the electrolyte to obtain a lithium-ion battery electrolyte with better thermal stability. ...

Embodiment 3

[0039] A preparation method of an organic electrolyte capable of improving thermal stability of lithium-ion batteries, comprising the following steps:

[0040] 1) Remove impurities and purify EC, PC and DEC organic solvents at room temperature and mix them in equal mass ratios to obtain a mixed solvent.

[0041] 2) Stir the mixed solvent continuously and add lithium salt LiBF4 to obtain an electrolyte solution without additives; the molar concentration range of lithium salt in the electrolyte solution is 1mol / L. ,

[0042] 3) the flame retardant additive

[0043]

[0044] Adding it into the above-mentioned electrolyte solution without additives can obtain a lithium-ion battery electrolyte solution with better thermal stability, wherein the mass of the flame retardant additive is 0.5% of the mass of the solvent. Then add other functional additives 1,3-propane sultone (PS) and fluoroethylene carbonate (FEC) into the above electrolyte to obtain a lithium-ion battery electrol...

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Abstract

The invention relates to a preparation method of an organic electrolyte capable of improving heat stability of a lithium-ion battery. The method comprises the following steps: (1) mixing two or more organic solvents at a room temperature at equal mass ratio after removing impurities, so as to obtain a mixed solvent; (2) lastingly stirring the mixed solvent and adding various lithium salts with different contents to obtain a series of electrolytes without an additive; and (3) adding a flame-retardant additive and other functional additives to the electrolytes without the additive, so as to obtain the lithium-ion battery electrolyte with relatively good heat stability. According to the preparation method, the heat stability of the electrolyte can be improved; the safety performance and the cycle performance of the electrolyte at a high temperature can be improved; prolonging of the cycle lifetime and the storage lifetime of the lithium-ion battery is facilitated; and the method is simple in technique, low in cost, suitable for industrial production, and relatively wide in application prospect.

Description

Technical field: [0001] The invention relates to a method for preparing an organic electrolytic solution capable of improving the thermal stability of a lithium-ion battery, and belongs to the technical field of battery materials. Background technique: [0002] With the increasingly serious energy and environmental problems, people's awareness of environmental protection is increasing, and the requirements for energy storage equipment are becoming more and more stringent. Lithium-ion batteries are used in mobile phones, Portable electronic devices such as notebook computers are widely used in the market. The current popular lithium-ion battery electrolyte system uses a mixed solution of high dielectric constant, high-viscosity cyclic carbonate and low dielectric constant, low-viscosity chain carbonate as the solvent, lithium hexafluorophosphate as the lithium salt, and adding Some other functional additives enable the comprehensive performance index of the electrolyte to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058
CPCH01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 董苗苗谷秀娟许日勤王群峰梁振洋
Owner SHANDONG HONGZHENG BATTERY MATERIAL TECH
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