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Lithium ion battery electrolyte with consideration to water removal, acid reduction and improvement of high-voltage performance

A lithium-ion battery, high-voltage technology, applied to secondary batteries, circuits, electrical components, etc., can solve problems such as difficult storage, instability, and easy decomposition, and achieve low cost, improved stability, and simple preparation process.

Inactive Publication Date: 2018-04-24
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, hexamethyldisilazane itself is unstable, easily decomposed in the air, and difficult to store; and the generated NH 4 F is unstable, especially easy to decompose at high temperature [6]

Method used

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  • Lithium ion battery electrolyte with consideration to water removal, acid reduction and improvement of high-voltage performance
  • Lithium ion battery electrolyte with consideration to water removal, acid reduction and improvement of high-voltage performance
  • Lithium ion battery electrolyte with consideration to water removal, acid reduction and improvement of high-voltage performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:1, and remove impurities and water to obtain a mixed solvent ; At room temperature 25°C, 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 1.0mol / L;

[0040] (2) Add 2% of N,N-dimethylaminotrimethylsilane to the ordinary electrolyte prepared in step (1), and stir evenly to obtain a lithium-ion battery electrolytic solution that takes into account both water removal and acid reduction and high-voltage performance improvement liquid.

Embodiment 2

[0042] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:1, and remove impurities and water to obtain a mixed solvent ; At room temperature 25°C, 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 1.0mol / L;

[0043] (2) Add 2% of N,N-dimethylaminotrimethylsilane and 1% of vinylene carbonate (VC) to the ordinary electrolyte prepared in step (1), and stir well to get both water removal and reduction Acid and Li-ion battery electrolyte for high voltage performance.

Embodiment 3

[0045] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:1, and remove impurities and water to obtain a mixed solvent ; At room temperature 25°C, 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 1.0mol / L;

[0046] (2) Add 1% of N,N-dimethylaminotrimethylsilane and 1% of vinylene carbonate (VC) to the ordinary electrolyte prepared in step (1), stir evenly to obtain a solution that takes into account both water removal and reduction Acid and Li-ion battery electrolyte for high voltage performance.

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Abstract

The invention discloses lithium ion battery electrolyte with consideration to water removal, acid reduction and improvement of high-voltage performance, and relates to lithium ion batteries. The lithium ion battery electrolyte with the consideration to the water removal, the acid reduction and the improvement of the high-voltage performance comprises, by weight, 5.0%-18.0% of lithium salt, 83.0%-94.0% of non-aqueous organic solvents, 0.1%-5.0% of silazane additives and 0.1%-5.0% of other functional additives. The lithium ion battery electrolyte has the advantages of simple preparation process,low cost, easiness in implementation and good market prospect.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a silazane additive and a lithium-ion battery electrolyte prepared by using the silazane additive and taking into account both water removal and acid reduction and high-voltage performance improvement. Background technique [0002] Due to the advantages of high energy density and good cycle performance, lithium-ion batteries have been widely used in portable devices. [1] However, its application in larger-scale applications, especially in the field of grid energy storage and power batteries, puts forward higher requirements for the energy density and power density of lithium-ion batteries. [2] In addition to the improvement of existing materials and battery production processes, high-voltage (5V) cathode materials are one of the more popular research directions. [3] The high energy density of the battery is mainly achieved by increasing the charging depth of the positive electrode active...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 赵金保周荣王静
Owner XIAMEN UNIV
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