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High temperature resistant electrolyte for lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as the inability to effectively improve the high temperature resistance of the electrolyte, and achieve increased cycle stability, high temperature stability, and enhanced magnification. performance effect

Active Publication Date: 2017-10-27
DONGFENG COMML VEHICLE CO LTD
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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 overcome the problem in the prior art that the high temperature resistance of the electrolyte cannot be effectively improved, and to provide a high temperature resistant electrolyte for lithium ion batteries that can effectively improve the high temperature resistance of the electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A high-temperature-resistant electrolyte for lithium ion batteries, the raw material of which comprises an electrolyte lithium salt, an organic solvent, and a high-temperature-resistant additive, wherein the electrolyte lithium salt is LiPF 6 , its concentration in the organic solvent is 1mol / L, the composition of the organic solvent and its volume ratio are: ethylene carbonate 20, ethyl methyl carbonate 50, dimethyl carbonate 30, and the high temperature resistant additive is two Lithium fluorooxalate borate, its mass accounts for 2% of the total mass of the electrolyte;

[0044] During preparation, the electrolyte lithium salt is first dissolved in an organic solvent to form a mixed solution, then a high temperature resistant additive is added to the mixed solution and stirred evenly to obtain a high temperature resistant electrolyte for lithium ion batteries.

[0045] In order to test the effect of this embodiment, the LiPF 6 , the electrolyte of organic solvent com...

Embodiment 2

[0048] With the embodiment 1, the difference is that the raw material composition of the electrolyte also includes a cycle-stabilizing additive, and the cycle-stabilizing additive is vinylene carbonate, and its mass accounts for 1% of the total electrolyte mass;

[0049] During preparation, the electrolyte lithium salt is first dissolved in an organic solvent to form a mixed solution, and then a high temperature resistant additive and a cycle stabilizing additive are added to the mixed solution and stirred evenly to obtain a high temperature resistant electrolyte for a lithium ion battery.

[0050] The 300-cycle cycle capacity of the lithium-ion battery prepared with the electrolyte in this implementation is 94.8% at room temperature, and the 200-cycle cycle capacity at 60°C is 72.4%.

Embodiment 3

[0052] With Embodiment 1, the difference is that the raw material composition of the electrolyte also includes a film-forming additive, and the film-forming additive is chloroethylene carbonate, and its mass accounts for 1% of the total electrolyte mass;

[0053] During preparation, the electrolyte lithium salt is first dissolved in an organic solvent to form a mixed solution, and then a high temperature resistant additive and a film-forming additive are added to the mixed solution and stirred evenly to obtain a high temperature resistant electrolyte for a lithium ion battery.

[0054] The 300-cycle cycle capacity of the lithium-ion battery prepared with the electrolyte in this implementation is 93.1% at room temperature, and the 200-cycle cycle capacity at 60°C is 71.8%.

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Abstract

The invention provides a high temperature-resistant electrolyte solution of a lithium ion battery. The high temperature-resistant electrolyte solution of the lithium ion battery comprises the raw materials of lithium electrolyte salt, an organic solvent, a high temperature-resistant additive, a film forming additive and a circulatory stability additive, wherein the concentration of the lithium electrolyte salt in the organic solvent is 0.5-2 mol / L; the organic solvent comprises the following components in parts by volume: 5-30 parts of a high-dielectric-constant organic base solvent, 40-65 parts of a high-boiling-point organic solvent, and 5-55 parts of a low-viscosity organic solvent; the high temperature-resistant additive is at least one of lithium tetrafluoroborate, lithium difluoroborate, lithium bis(malonato)borate, lithium bis(oxalate)borate and lithium malonato oxalate borate, the mass of the high temperature-resistant additive accounts for 0.1-8% of the total mass of the electrolyte solution, the mass of the film forming additive accounts for 0.2-4% of the total mass of the electrolyte solution, and the mass of the circulatory stability additive accounts for 0.5-5% of the total mass of the electrolyte solution. According to the invention, the high temperature resistance and circulatory stability of the lithium ion battery are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high temperature resistant electrolyte for lithium ion batteries, which is suitable for improving the high temperature resistance performance and cycle stability of lithium ion batteries. Background technique [0002] Electrolyte is the only material in lithium-ion battery that is in contact with the positive electrode, negative electrode and separator. It plays a crucial role in the specific capacity, operating temperature range, cycle efficiency and safety performance of the battery. The existing lithium-ion battery electrolyte will produce electrochemical oxidation and reduction reactions due to the potential difference between the positive and negative electrodes during the electrochemical process, resulting in the decomposition of the electrolyte, which may destroy the SEI film on the surface of the electrode, causing the battery to produce gas, I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 陈果刘立炳
Owner DONGFENG COMML VEHICLE CO LTD
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