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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 lithium-ion batteries, can solve problems such as damage to positive electrode materials, insufficient stability of positive electrode materials, and performance degradation of battery charge and discharge cycles, etc., to inhibit dissolution, improve cycle performance and safety performance Effect

Inactive Publication Date: 2014-03-26
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, while increasing the voltage of the positive electrode material, the performance of the battery charge-discharge cycle is declining. On the one hand, the reason is that the positive electrode material is not stable enough, and on the other hand, it is the matching problem of the electrolyte. Oxidative decomposition occurs on the surface of the positive electrode, and the oxidative decomposition reaction of the electrolyte will also promote the destruction of the positive electrode material

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

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Embodiment 1

[0033] (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 use Molecular sieves, calcium hydride and lithium hydride were purified to remove impurities and water to obtain a mixed solvent; at a room temperature of 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;

[0034] (2) Add tris(trimethylsilane) phosphate to the ordinary electrolyte prepared in step (1), the amount of tris(trimethylsilane) phosphate is 2% of the mass of the ordinary electrolyte; obtain high voltage lithium ion Battery functional electrolyte.

Embodiment 2

[0036] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent dimethyl carbonate (DMC) according to the mass ratio EC:DMC=1:2, and use Molecular sieve, calcium hydride and lithium hydride were purified to remove impurities and water to obtain a mixed solvent; at a room temperature of 28°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 0.8mol / L;

[0037] (2) Add tris(trimethylsilane) phosphate to the ordinary electrolyte prepared in step (1), the amount of tris(trimethylsilane) phosphate is 1% of the mass of the ordinary electrolyte; obtain high voltage lithium ion Battery functional electrolyte.

Embodiment 3

[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=1:3, and use Molecular sieve, calcium hydride and lithium hydride were purified to remove impurities and water to obtain a mixed solvent; at a room temperature of 28°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 tris(trimethylsilane) phosphate to the ordinary electrolyte prepared in step (1), the amount of tris(trimethylsilane) phosphate is 1% of the mass of the ordinary electrolyte; obtain high voltage lithium ion Battery functional electrolyte.

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a high voltage lithium ion battery functional electrolyte and a preparation method and application. The functional electrolyte is obtained by adding a function additive into a common electrolyte, wherein the added function additive is equal to 1-5% of the common electrolyte by mass; the common electrolyte comprises a cyclic carbonate solvent, a linear carbonate solvent, and conductive lithium salts; the function additive is tris(trimethylsilyl) phosphate. According to the function additive adopted by the high voltage lithium ion battery functional electrolyte, a layer of relatively thin, stable and protective film is generated on the surface of an anode in a 3-4.9 V charge-discharge system; on the one hand, oxygenolysis of the electrolyte under high voltage is restrained, on the other hand, anode materials are protected. Therefore, cycle performance and safety performance of the high voltage lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a high-voltage lithium-ion battery functional electrolyte, a preparation method and an application thereof. Background technique [0002] At present, the positive electrode materials of commercial lithium-ion batteries include lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate, and ternary materials. 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. 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, mainly to achieve high energy density of batteries by increasing the charging depth of cathode active materials. [0003] However, while increasin...

Claims

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Application Information

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IPC IPC(8): H01M10/0563H01M10/058H01M10/0525
CPCY02E60/122H01M10/0525H01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 李伟善戎海波邢丽丹许梦清刘其峰
Owner SOUTH CHINA NORMAL UNIVERSITY
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