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High voltage lithium ion battery functional electrolyte and preparation method and application

A lithium-ion battery and electrolyte technology, which is applied in the field of high-voltage lithium-ion battery functional electrolyte and preparation, can solve the problems of unable to form graphite electrode interface, low conductivity, high viscosity, etc., to achieve the suppression of dissolution phenomenon and small battery impedance , the effect of good charge and discharge performance

Inactive Publication Date: 2014-07-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte system containing these types of solvent molecules has good oxidation stability. However, due to its high viscosity, low conductivity, and the inability to form an SEI film on the graphite electrode interface, its research is still limited to basic research.

Method used

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  • High voltage lithium ion battery functional electrolyte and preparation method and application
  • High voltage lithium ion battery functional electrolyte and preparation method and application
  • High voltage lithium ion battery functional electrolyte and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Mix cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent dimethyl carbonate (DMC) by mass ratio EC:DMC=1:2, and adopt Molecular sieve, calcium hydride, and lithium hydride are purified to remove impurities and water to obtain a mixed solvent; the conductive lithium salt LiPF 6Dissolve in a mixed solvent of ethylene carbonate and dimethyl carbonate, stir evenly to obtain a common electrolyte; among them, the conductive lithium salt LiPF 6 The final concentration in ordinary electrolyte is 1.0mol / L;

[0046] (2) Add dimethyl phenyl phosphate to the common electrolyte prepared in step (1), the amount of dimethyl phenyl phosphate is 0.5% of the mass of the common electrolyte; obtain a high-voltage lithium-ion battery functional electrolyte.

Embodiment 2

[0048] (1) cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent dimethyl carbonate (DMC) are mixed according to mass ratio EC:DMC=1:3, and adopt Molecular sieve, calcium hydride, and lithium hydride are purified to remove impurities and water to obtain a mixed solvent; the conductive lithium salt LiPF 6 Dissolve in a mixed solvent of ethylene carbonate and dimethyl carbonate, stir evenly to obtain a common electrolyte; among them, the conductive lithium salt LiPF 6 The final concentration in ordinary electrolyte is 0.8mol / L;

[0049] (2) Add dimethyl phenyl phosphate to the ordinary electrolyte prepared in step (1), the amount of dimethyl phenyl phosphate is 0.1% of the mass of the ordinary electrolyte; obtain a high-voltage lithium-ion battery functional electrolyte.

Embodiment 3

[0051] (1) cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) are mixed according to mass ratio EC:EMC=1:2, and adopt Molecular sieve, calcium hydride, and lithium hydride are purified to remove impurities and water to obtain a mixed solvent; the conductive lithium salt LiSO 3 CF 3 Dissolve in a mixed solvent of ethylene carbonate and dimethyl carbonate, stir evenly to obtain a common electrolyte; among them, the conductive lithium salt LiSO 3 CF 3 The final concentration in ordinary electrolyte is 1.0mol / L;

[0052] (2) Add dimethyl phenyl phosphate to the common electrolyte prepared in step (1), the amount of dimethyl phenyl phosphate is 1% of the mass of the common electrolyte; obtain a high-voltage lithium-ion battery functional electrolyte.

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Abstract

The invention belongs to the field of chemistry and chemical engineering, in particular to high voltage lithium ion battery functional electrolyte and a preparation method and application. The high voltage lithium ion battery functional electrolyte is obtained by adding a functional addictive with the mass equivalent to 0.1-5% of the mass of ordinary electrolyte into the ordinary electrolyte, the ordinary electrolyte is formed by cyclic carbonate solvent, linear carbonate solvent and conductive lithium salt. The functional addictive is dialkyl phenyl phosphonic acid salt, the structural formula of the ordinary electrolyte is shown as formula 1, wherein 0<=n<=5. The high voltage lithium ion battery functional electrolyte can remarkably improve circulating stability of a high voltage lithium ion battery under the condition of high temperature and high potential and can be widely applied to the field of lithium ion battery manufacture. (Please find the formula in the specification).

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and in particular relates to a high-voltage lithium-ion battery functional electrolyte, a preparation method and an application. Background technique [0002] Lithium-ion batteries are secondary batteries with the highest specific energy so far, and have been widely used as power sources for portable electronic devices, such as mobile phones, digital cameras, and notebook computers. Based on the current needs of energy saving and emission reduction, people expect lithium-ion batteries to develop further and replace fuel as the power source of transportation. The new energy electric vehicle industry has been listed as a strategic emerging industry field by the country. The low specific energy density and high cost of lithium-ion batteries are the current bottlenecks in the development of lithium-ion batteries to power batteries. [0003] In order to improve the specific energy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10Y02P70/50
Inventor 麦少苇许梦清李伟善廖晓琳
Owner SOUTH CHINA NORMAL UNIVERSITY
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