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A kind of lithium ion battery electrolyte

An electrolyte and electrolyte technology, applied in the direction of electrolyte, secondary battery, secondary battery repair/maintenance, etc., can solve the problems of poor thermal stability and high temperature resistance, achieve good thermal stability, improve electrical conductivity, and increase concentration Effect

Inactive Publication Date: 2020-01-14
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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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 provide a lithium-ion battery electrolyte to solve the problems of poor thermal stability and high temperature resistance of the existing lithium-ion battery electrolyte

Method used

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  • A kind of lithium ion battery electrolyte
  • A kind of lithium ion battery electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A lithium-ion battery electrolyte, including solvent, electrolyte lithium salt and the first additive; the quality of electrolyte lithium salt accounts for 12% of the total mass of electrolyte, and the electrolyte lithium salt is LiPF 6 .

[0023] Wherein, the solvent includes ethylene carbonate and ethyl methyl carbonate, and the mass of the solvent accounts for 85% of the mass of the electrolyte, wherein the volume fraction of ethylene carbonate is 30%, and that of ethyl methyl carbonate is 70%.

[0024] The first additive is a high-temperature additive lithium difluorooxalate borate (LiODFB), whose mass accounts for 3.0% of the total mass of the electrolyte.

[0025] After uniformly mixing the solvent, the electrolyte lithium salt and the first additive, a lithium ion electrolyte solution is prepared.

Embodiment 2

[0027] An electrolyte solution for a lithium-ion battery, including a solvent, an electrolyte lithium salt, a first additive and a second additive; the quality of the electrolyte lithium salt accounts for 15% of the total mass of the electrolyte, and the electrolyte lithium salt is LiPF 6 .

[0028] Wherein, the solvent includes ethylene carbonate and ethyl methyl carbonate, and the mass of the solvent accounts for 80% of the mass of the electrolyte, wherein the volume fraction of propylene carbonate is 10%, and the volume fraction of diethyl carbonate is 90%.

[0029] The first additive is a high-temperature additive lithium difluorooxalate borate (LiODFB), whose mass accounts for 2.0% of the total mass of the electrolyte.

[0030] The second additive is a film-forming additive, which includes fluoroethylene carbonate (FEC) and triphenyl phosphite (TPPI), and the quality of fluoroethylene carbonate (FEC) accounts for 1.5% of the total mass of the electrolyte, and triphenyl ph...

Embodiment 3

[0033] An electrolyte solution for a lithium-ion battery, including a solvent, an electrolyte lithium salt, a first additive and a second additive; the quality of the electrolyte lithium salt accounts for 15% of the total mass of the electrolyte, and the electrolyte lithium salt is LiPF 6 .

[0034] Wherein, the solvent includes propylene carbonate and dimethyl carbonate, and the mass of the solvent accounts for 80% of the mass of the electrolyte, wherein the volume fraction of propylene carbonate is 20%, and that of dimethyl carbonate is 80%.

[0035] The first additive is a high-temperature additive potassium difluorooxalate borate, and its mass accounts for 1.0% of the total mass of the electrolyte.

[0036] The second additive is a film-forming additive, which includes vinylene carbonate and 4-methyl ethylene sulfite, the quality of vinylene carbonate accounts for 3.0% of the total mass of the electrolyte, and the quality of 4-methyl ethylene sulfite accounts for 1.0% of ...

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Abstract

The invention relates to a lithium-ion battery electrolyte which comprises the following components in parts by weight: 80-88 parts of solvents, 12-15 parts of electrolyte lithium salt and 0.5-3 parts of a first additive, wherein borate oxalate is used as the first additive and borate oxalate and lithium salt form a compound with high thermal stability so as to form the lithium-ion battery electrolyte capable of resisting against high temperature. The lithium-ion battery electrolyte provided by the invention is prepared according to a specific formula, the thermal stability is high, the high temperature resistance is effectively promoted, the lithium-ion battery electrolyte has a high temperature resisting property and the application scope is greatly promoted.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a lithium-ion battery electrolyte. Background technique [0002] Lithium-ion batteries are widely used in the field of portable consumer electronics terminals because of their high energy density, high operating voltage, high output power, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. At present, lithium-ion batteries are used in the transportation field, such as power vehicles, backup power supplies, etc., which put forward higher requirements on the energy density, cycle life, and safety performance of lithium-ion batteries. [0003] However, at present, the applicable temperature range of lithium-ion batteries is narrow, and when the temperature is higher than 60°C, the battery capacity decays rapidly, and even combustion or explosion may occur, which limits its wide application. When a lithium-io...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235H01M2300/0037Y02E60/10
Inventor 赵锦成邓亚锋刘波李展翼陈勇崔益秀
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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