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A kind of high voltage functional electrolyte and its preparation method and application

An electrolyte and high-voltage technology, which is applied in the manufacture of electrolyte batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problem of unstable spinel lithium nickel manganese oxide material structure, decreased electrochemical performance of batteries, and changes in the morphology of positive electrode materials, etc. Problems, achieve the effect of room temperature and high temperature cycle performance improvement, inhibition of further contact, and inhibition of surface activity

Active Publication Date: 2018-06-08
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 and discharge cycles is declining. On the one hand, the reason is that the structure of the spinel lithium nickel manganese oxide material is not stable due to the ginger Taylor effect; on the other hand, the electrolyte 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 oxidative decomposition reaction of the electrolyte itself will also promote malignant reactions such as morphology changes and structural collapse of the positive electrode material.

Method used

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  • A kind of high voltage functional electrolyte and its preparation method and application
  • A kind of high voltage functional electrolyte and its preparation method and application
  • A kind of high voltage functional electrolyte and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0032] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) at a volume ratio of EC:EMC=3:7, and use molecular sieves, calcium hydride, and lithium hydride to purify Remove impurities and 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 diethyl (thiophen-2-ylmethyl) phosphate (the reagent is purchased from Adamas, the purity is greater than 98%, and is used without further purification) in the common electrolyte prepared in step (2), two The dosage of ethyl (thiophen-2-ylmethyl) phosphate is 0.25% of the mass of the electrolyte to obtain a high-voltage functional electrolyte for lithium ion batteries.

Embodiment 2

[0036] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) at a volume ratio of EC:EMC=3:7, and use molecular sieves, calcium hydride, and lithium hydride to purify Remove impurities and 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 diethyl (thiophen-2-ylmethyl) phosphate (the reagent is purchased from Adamas, the purity is greater than 98%, and is used without further purification) in the common electrolyte prepared in step (2), two The consumption of ethyl (thiophen-2-ylmethyl) phosphate is 0.5% of the mass of the electrolyte to obtain a high-voltage functional electrolyte for lithium ion batteries.

Embodiment 3

[0040] (1) Mix the cyclic carbonate solvent ethylene carbonate (EC) and the linear carbonate solvent ethyl methyl carbonate (EMC) at a volume ratio of EC:EMC=3:7, and use molecular sieves, calcium hydride, and lithium hydride to purify Remove impurities and 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 diethyl (thiophen-2-ylmethyl) phosphate (the reagent is purchased from Adamas, the purity is greater than 98%, and is used without further purification) in the common electrolyte prepared in step (2), two The amount of ethyl (thiophen-2-ylmethyl) phosphate is 1% of the mass of the electrolyte to obtain a high-voltage functional electrolyte for lithium ion batteries.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a high-voltage functional electrolyte, a preparation method and an application thereof. The high-voltage functional electrolyte is prepared by adding a functional additive equivalent to 0.25% to 5% of the mass of the ordinary electrolyte in the ordinary electrolyte; the structural formula of the functional additive is shown in formula (1). The functional additive diethyl (thiophene-2-ylmethyl) phosphate of the present invention can be used as a high-pressure film-forming additive and a flame-retardant additive of a lithium ion electrolyte, and the electrolyte containing the functional additive does not burn, and the The room temperature and high temperature cycle performance of the lithium-ion battery at 3-5.0V is improved, and the application prospect is good. .

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-voltage functional electrolyte, 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 batteries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058
CPCH01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 李伟善朱云敏罗雪仪许梦清廖友好刑丽丹
Owner SOUTH CHINA NORMAL UNIVERSITY
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