Application of borate compound serving as additive for high-voltage lithium-ion battery electrolyte

An electrolyte additive and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of battery charge-discharge cycle and other electrical performance decline, the structure of the positive electrode material is not stable enough, the shape of the positive electrode material changes, etc., to optimize the surface of the positive and negative electrodes Membrane, improve cycle stability, inhibit the effect of further exposure

Inactive Publication Date: 2014-07-23
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, while increasing the voltage of the positive electrode material, the electrical properties of the battery such as charge and discharge cycles are declining. On the one hand, the reason is that the structure of the newly developed positive electrode material is not stable enough, and on the other hand, it is the matching pro

Method used

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  • Application of borate compound serving as additive for high-voltage lithium-ion battery electrolyte
  • Application of borate compound serving as additive for high-voltage lithium-ion battery electrolyte
  • Application of borate compound serving as additive for high-voltage lithium-ion battery electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) The cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mass ratio EC:EMC:DEC=1:3:2 mixed with molecular sieve Calcium hydride and lithium hydride are purified to remove impurities and water to obtain a mixed solvent;

[0052] (2) The conductive lithium salt LiPF 6 Dissolve in the mixed solvent that step (1) obtains, stir well, be made into common electrolyte; Wherein conductive lithium salt LiPF 6 The final concentration in ordinary electrolyte is 0.8mol / L;

[0053] (3) Triphenyl borate is added to the common electrolyte prepared in step (2), and the amount of triphenyl borate is 1% of the mass of the common electrolyte; a high-voltage lithium-ion battery electrolyte is obtained.

Embodiment 2

[0055] (1) Mix cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) according to the mass ratio EC:EMC:DEC=1:3:2 mixed with molecular sieve Calcium hydride and lithium hydride are purified to remove impurities and water to obtain a mixed solution;

[0056] (2) The conductive lithium salt LiPF 6 Dissolve in the mixed solvent that step (1) obtains, stir well, be made into common electrolyte; Wherein conductive lithium salt LiPF 6 The final concentration in ordinary electrolyte is 0.8mol / L;

[0057] (3) adding triethyl borate to the ordinary electrolyte prepared in step (2), the consumption of triethyl borate being 0.1% of the mass of the ordinary electrolyte; obtaining a high-voltage lithium-ion battery electrolyte.

Embodiment 3

[0059] (1) The cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mass ratio EC:EMC:DEC=10:1:1 mixed with molecular sieve Calcium hydride and lithium hydride are purified to remove impurities and water to obtain a mixed solvent;

[0060] (2) The conductive lithium salt LiPF 6 Dissolve in the mixed solvent that step (1) obtains, stir well, be made into common electrolyte; Wherein conductive lithium salt LiPF 6 The final concentration in common electrolyte is 1.2mol / L;

[0061] (3) Add triethyl borate to the common electrolyte prepared in step (2), the consumption of triethyl borate is 5% of the quality of common electrolyte; obtain high-voltage lithium-ion battery electrolyte.

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Abstract

The invention belongs to the field of lithium-ion batteries, and particularly relates to an application of a borate compound serving as an additive for high-voltage lithium-ion battery electrolyte. The borate compound is in a structure as described in formula 1. The invention also discloses the high-voltage lithium-ion battery electrolyte which is obtained by adopting a means of adding the functional additive into common electrolyte, wherein the weight of the added functional additive accounts for 0.1%-5% that of the common electrolyte; the common electrolyte consists of a cyclic carbonate solvent, a liner carbonate solvent and conductive lithium salt; the functional additive is the borate compound. By virtue of the added additive, on one hand, the interface of a positive electrode/the electrolyte is optimized, the surface activity of the positive electrode is lowered and the oxygenolysis of the electrolyte is inhibited; on the other hand, due to the introduction of boron, the safety of the electrolyte is enhanced remarkably. By virtue of the high-voltage lithium-ion battery electrolyte, the safety performance and the cycling performance of a high-voltage (3-4.9Vvs.Li/Li<+>) lithium battery can be enhanced.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and specifically relates to the application of a boric acid ester compound as an electrolyte additive for a high-voltage lithium-ion battery. Background technique [0002] At present, with the popularization of portable electronic devices, the development of electric tools and electric vehicles in recent years, lithium-ion batteries as a new generation of high-energy power sources have received extensive attention. At present, the positive electrode materials of commercial lithium-ion batteries mainly include lithium manganese oxide, lithium cobalt oxide, ternary materials, and lithium iron phosphate. The charging cut-off voltage generally does not exceed 4.2V. With the advancement of technology and the continuous development of the market, it is increasingly important and urgent to increase the energy density of lithium batteries. Therefore, increasing the operating voltage of lithium-ion b...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 邢丽丹王再盛刘其峰李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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