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High-voltage anti-corrosion electrolyte and preparing method and application thereof

An electrolyte and anti-corrosion technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as corrosion of active materials and battery accessories, degradation of battery electrochemical performance, and changes in the morphology of positive electrode materials, to optimize the surface of the positive electrode. Film, inhibition of further contact, inhibition of surface activity

Inactive Publication Date: 2016-11-09
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 electrochemical performance of the battery such as charge-discharge cycle is declining. On the one hand, the HF generated by the electrolyte under high voltage corrodes the battery accessories, and on the other hand, it is due to the corrosion of the electrolyte and the material. matching problem
Conventional commercial electrolytes are easy to oxidize and decompose on the surface of the positive electrode of the battery at a high potential of 5V. The decomposition products of the electrolyte are HF, which will corrode the active materials and battery accessories, and the oxidative decomposition of the electrolyte itself will also promote the positive electrode material. Morphological changes, structural collapse and other adverse reactions

Method used

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  • High-voltage anti-corrosion electrolyte and preparing method and application thereof
  • High-voltage anti-corrosion electrolyte and preparing method and application thereof

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Effect test

Embodiment 1

[0032] (1) Cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mass ratio EC:EMC:DEC=3:5:2 mixing, and using molecular sieves, calcium hydride, and lithium hydride to purify, remove impurities, and remove water to obtain a mixed solvent;

[0033] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, and stir evenly to obtain a common electrolyte;

[0034] (3) Add tris(trimethylsilyl) phosphite to the ordinary electrolyte prepared in step (2) (the reagent is purchased from Aladdin, the purity is greater than 96%, and it is used without further purification), tris(trimethylsilyl) phosphite The consumption of base) ester is 0.5% of electrolyte quality, obtains the high-voltage anti-corrosion electrolyte that is used for lithium-ion battery.

Embodiment 2

[0036] (1) Cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mass ratio EC:EMC:DEC=3:5:2 mixing, and using molecular sieves, calcium hydride, and lithium hydride to purify, remove impurities, and remove water to obtain a mixed solvent;

[0037] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, and stir evenly to obtain a common electrolyte;

[0038] (3) Add tris(trimethylsilyl) phosphite to the ordinary electrolyte prepared in step (2) (the reagent is purchased from Aladdin, the purity is greater than 96%, and it is used without further purification), tris(trimethylsilyl) phosphite The consumption of base) ester is 1% of electrolyte quality, obtains the high-voltage anti-corrosion electrolyte that is used for lithium-ion battery.

Embodiment 3

[0040] (1) Cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mass ratio EC:EMC:DEC=3:5:2 mixing, and using molecular sieves, calcium hydride, and lithium hydride to purify, remove impurities, and remove water to obtain a mixed solvent;

[0041] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the solvent obtained in step (1), the final concentration is 1.0mol / L, and stir evenly to obtain a common electrolyte;

[0042] (3) Add tris(trimethylsilyl) phosphite to the ordinary electrolyte prepared in step (2) (the reagent is purchased from Aladdin, the purity is greater than 96%, and it is used without further purification), tris(trimethylsilyl) phosphite The consumption of base) ester is 1.5% of electrolyte quality, obtains the high-voltage anti-corrosion electrolyte that is used for lithium-ion battery.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses high-voltage anti-corrosion electrolyte and a preparing method and application thereof. The high-voltage anti-corrosion electrolyte is obtained by adding a functional additive to ordinary electrolyte, wherein the mass of the functional additive is 0.25-5% of the mass of the ordinary electrolyte. The structural formula of the functional additive is shown in formula (1). The functional additive phosphite trimester (trimethylsilyl) can inhibit the generation of HF in lithium ion electrolyte and prevent device corrosion; furthermore, the high-voltage cycle performance of a lithium ion battery prepared by means of the functional additive is improved under 3-5.0 V, and application prospects are broad.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage anti-corrosion electrolyte and a preparation method and application thereof. Background technique [0002] At present, among commercial secondary batteries, lithium-ion batteries have the highest specific energy and the best cycle performance, and because of the diversity of electrode materials, they have broad development prospects as energy storage batteries. 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 ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567Y02E60/10
Inventor 李伟善朱云敏罗雪仪陈晓乔钟晓欣洪鹏波蔡霞夏攀郑雄文
Owner SOUTH CHINA NORMAL UNIVERSITY
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