Electrolyte with polyanion functional group and preparation method and application thereof

A polyanion and functional group technology, which is applied in the field of electrolytes with polyanion functional groups and its preparation, can solve the problems of reduced ionic conductivity of the electrolyte, influence of battery capacity and Coulombic efficiency, difficult dissociation, etc., and achieves reduction of lattice energy, Improvement of electrochemical and thermal stability, effect of effective interface

Active Publication Date: 2016-10-26
XIAMEN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It should be pointed out that PO x f y - The group radius is small, and it is difficult to dissociate in non-aqueous organic solvents. Whether it is used as an electrolyte main salt or an auxiliary electrolyte, it will lead to a decrease in the ionic conductivity of the electrolyte, which will affect the battery capacity and Coulombic efficiency.

Method used

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  • Electrolyte with polyanion functional group and preparation method and application thereof
  • Electrolyte with polyanion functional group and preparation method and application thereof
  • Electrolyte with polyanion functional group and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1) Electrolyte preparation

[0039] The electrolyte solution was prepared in a glove box, which was filled with high-purity argon, the moisture was controlled below 5 ppm, and the temperature was room temperature. Ethylene carbonate (EC), dimethyl carbonate (DEC), and ethyl methyl carbonate (EMC) were purified and mixed in a mass ratio of 30:30:40, and impurities and water were removed to obtain a mixed solvent system, and then 1mol / L lithium hexafluorophosphate (LiPF 6 ) was dissolved in a mixed solvent, and an electrolyte was obtained by adding 1% VC and 1% compound 1 at the same time, and the conductivity of the electrolyte was tested.

[0040] 2) Preparation of positive pole piece

[0041] Mix the positive electrode active material LiNi according to the mass ratio of 95:3:2 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the conductive agent Super-P and the binder PVDF (HSV900), and then uniformly disperse them in the solvent NMP to obtain the positive electrode slurry. The slurry ...

Embodiment 2

[0055] Except that 1% of compound 1 was replaced by 1% of compound 2 in the preparation of the electrolyte, the same as in Example 1, the data of normal temperature cycle, high temperature cycle and high temperature storage were tested.

Embodiment 3

[0057] Except that 1% of compound 1 was replaced by 1% of compound 3 in the preparation of the electrolyte, the same as in Example 1, the data of normal temperature cycle, high temperature cycle and high temperature storage were tested.

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Abstract

The invention discloses an electrolyte with a polyanion functional group and a preparation method and application thereof, and relates to a nonaqueous secondary battery electrolyte. For example, the preparation method of Li[PF2(PO2F2)2(C2O4)] comprises the following steps: (1) dissolving Li3PO4 into dimethyl carbonate, adding LiPF6, and recycling a settled solution for recrystallization after reaction so as to obtain LiPO2F2; (2) dissolving the LiPO2F2 obtained in the first step into dimethyl ether, then introducing PF5 gas, and recycling a settled solution for recrystallization so as to obtain LiPF4(PO2F2)2; and (3) under an inert atmosphere condition, dissolving the LiPF4(PO2F2)2 obtained in the second step into the dimethyl ether, then adding oxalic acid, and reacting to obtain the product LiPF2(PO2F2)2(C2O4). The electrolyte with the polyanion functional group can be used in the preparation of a nonaqueous electrolyte and a nonaqueous secondary battery.

Description

technical field [0001] The invention relates to a non-aqueous secondary battery electrolyte, in particular to a type of electrolyte with polyanion functional groups, a preparation method and application thereof. Background technique [0002] Reducing the consumption of fossil energy and reducing the emission of greenhouse gases such as carbon dioxide have become one of the most urgent problems for all human beings to solve. Today, as the energy environment continues to deteriorate, the role of the lithium-ion battery industry in the field of new energy has become increasingly prominent. It is a practical and feasible method to develop electric vehicles and use batteries to provide power to replace petroleum. It is important to ensure energy security and develop a low-carbon economy. way. [0003] At present, my country and major developed countries in the world have issued many policies to support new energy vehicles. New energy vehicles are listed as one of the seven new i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568
CPCH01M10/0568H01M2300/0025Y02E60/10
Inventor 杨勇赵卫民
Owner XIAMEN UNIV
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