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High-voltage electrolyte with rapid charge function and preparation method and application thereof

An electrolyte and functional technology, applied in the field of high-voltage, fast-charging functional electrolyte and its preparation, can solve the problems of long charging time, low actual utilization rate of capacity, small charging rate of charging voltage, etc. Room temperature cycle performance and rate performance improvement, and the effect of improving electrical conductivity

Inactive Publication Date: 2017-09-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the battery with high-nickel NCM (811) material as the electrode can achieve a large specific capacity, but its charging voltage and charging rate are relatively small, resulting in a low actual utilization rate of its capacity, and the charging time is long, which is far from being possible. satisfy people's demands

Method used

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  • High-voltage electrolyte with rapid charge function and preparation method and application thereof
  • High-voltage electrolyte with rapid charge function and preparation method and application thereof
  • High-voltage electrolyte with rapid charge function and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Cyclic carbonate solvent ethylene carbonate (EC), linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC), by 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;

[0031] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the mixed solvent obtained in step (1), the final concentration is 1.0mol / L, and stir evenly to obtain a common electrolyte;

[0032] (3) add difluoromethyl phenyl sulfone (the reagent is purchased from Adamas, the purity is greater than 98%, without further purification when used) in the common electrolyte prepared in step (2), the consumption of difluoromethyl phenyl sulfone is 1% of the mass of the electrolyte to obtain a high-voltage, fast-charging electrolyte for lithium-ion batteries.

Embodiment 2

[0034] (1) cyclic carbonate solvent ethylene carbonate (EC), linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC), by mass ratio EC:EMC:DEC=3:5 : 2 mixed, and purified by molecular sieves, calcium hydride and lithium hydride to remove impurities and remove water to obtain a mixed solvent;

[0035] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the mixed solvent obtained in step (1), the final concentration is 1.0mol / L, and stir evenly to obtain a common electrolyte;

[0036] (3) add difluoromethyl phenyl sulfone (the reagent is purchased from Adamas, the purity is greater than 98%, without further purification when used) in the common electrolyte prepared in step (2), the consumption of difluoromethyl phenyl sulfone is 2% of the mass of the electrolyte to obtain a high-voltage, fast-charging electrolyte for lithium-ion batteries.

Embodiment 3

[0038] (1) cyclic carbonate solvent ethylene carbonate (EC), linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC), by mass ratio EC:EMC:DEC=3:5 : 2 mixed, and purified by molecular sieves, calcium hydride and lithium hydride to remove impurities and remove water to obtain a mixed solvent;

[0039] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolve in the mixed solvent obtained in step (1), the final concentration is 1.0mol / L, and stir evenly to obtain a common electrolyte;

[0040](3) add difluoromethyl phenyl sulfone (the reagent is purchased from Adamas, the purity is greater than 98%, without further purification when used) in the common electrolyte prepared in step (2), the consumption of difluoromethyl phenyl sulfone is 5% of the mass of the electrolyte to obtain a high-voltage, fast-charging electrolyte for lithium-ion batteries.

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Abstract

The invention discloses a high-voltage electrolyte with a rapid charge function and a preparation method and application thereof, and belongs to the technical field of a lithium ion battery. The electrolyte is prepared by adding a functional additive in an amount equivalent to 1-5% of the mass of a conventional electrolyte into the conventional electrolyte, wherein the functional additive is difluoromethyl phenyl sulfone. The functional additive difluoromethyl phenyl sulfone can be used as a high-voltage and rapid-charge film formation additive; since the additive has relatively low oxidization potential, a compact and stable interface film can be formed on a surface of a positive electrode during the initial charge-discharge process, the surface membrane of the positive electrode is optimized, the surface activity of an electrode is prevented, so that further contact of the electrolyte and an electrode active substance and HF formation are prevented, and oxidization and decomposition of an electrolyte main solvent in the surface of the electrode are reduced; and the room-temperature cycle property and the rate performance of the lithium ion battery containing the functional additive are improved under 3-4.35V, and the lithium ion battery has favorable application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-voltage, fast-charging functional 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, there are mainly three schools of technical routes for cathode materials for power lithium batteries at home and abroad: lithium iron phosphate, lithium manganate, and ternary [nickel-cobalt-aluminate lithium (NCA) and nickel-cobalt lithium manganate (NCM)]. Among them, lithium iron phosphate as the positive electrode material has a long charge-discharge cycle life, but its disadvantages are that there is a large gap in energy density, high and low temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/004Y02E60/10
Inventor 李伟善杨雪蕊郑钦峰陈嘉威黄启明邢丽丹廖友好
Owner SOUTH CHINA NORMAL UNIVERSITY
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