High-voltage lithium ion battery electrolyte, preparation method and application of electrolyte

A lithium-ion battery, high-voltage technology, applied in the field of lithium-ion batteries, can solve the problems affecting application, high toxicity, etc., achieve the effects of inhibiting deposition and reduction, improving interface properties, improving cycle life and high temperature performance

Inactive Publication Date: 2014-07-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on electrolyte additives for high-voltage lithium-ion batteries, and most of the current additives are highly toxic, which affects their application in production

Method used

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  • High-voltage lithium ion battery electrolyte, preparation method and application of electrolyte
  • High-voltage lithium ion battery electrolyte, preparation method and application of electrolyte
  • High-voltage lithium ion battery electrolyte, preparation method and application of electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high-voltage lithium-ion battery electrolyte mainly includes organic solvents, conductive lithium salts and functional additives; the organic solvents are composed of ethylene carbonate (EC), ethyl methyl carbonate (EMC), fluoroethylene carbonate (FEC) and fluoroethers (CF 2 HCF 2 CH 2 -O-CF 2 CF 2 H) composition; wherein the weight ratio of EC and EMC is EC:EMC=1:2, the consumption of FEC is 5wt.%, fluoroether CF 2 HCF 2 CH 2 -O-CF 2 CF 2 The amount of H is 5wt.%; the conductive lithium salt is LiPF 6 , its concentration in the organic solvent is 1.0mol / L; the functional additive is ethylene carbonate (VEC) in an amount of 2wt.%.

[0031] The preparation method of above-mentioned high-voltage lithium-ion battery electrolyte is:

[0032] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0033](2) Dissolving the conductive lithium salt in the organic so...

Embodiment 2

[0038] A high-voltage lithium-ion battery electrolyte mainly includes following raw materials: an organic solvent, a conductive lithium salt and a functional additive; the organic solvent consists of ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate ( DMC), fluoroethylene carbonate (FEC) and fluoroethers CF 2 HCF 2 CH 2 -O-CF 2 CF 2 Composed of H, the weight ratio of EC, DMC and EMC is EC:EMC:DMC=1:1:1, the amount of FEC is 5wt.%, and the amount of fluoroether is 5wt.%. The conductive lithium salt is LiPF 6 , its concentration in the organic solvent is 1.0mol / L; The functional additive is ethylene carbonate (VEC) of 1wt.% and propenyl-1,3-sultone of 1wt.% ( PES).

[0039] The preparation method of above-mentioned high-voltage lithium-ion battery electrolyte is:

[0040] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0041] (2) Dissolving...

Embodiment 3

[0045] A high-voltage lithium-ion battery electrolyte mainly includes following raw materials: an organic solvent, a conductive lithium salt and a functional additive; the organic solvent consists of ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate ( DMC) and fluorocarbonates (fluoroethylene carbonate FEC and CH 3 -OCOO-CH 2 CF 3 ) composition, the weight ratio of EC, DMC and EMC is EC:EMC:DMC=1:1:1, the consumption of FEC is 10wt.%, CH 3 -OCOO-CH 2 CF 3 The dosage is 5wt.%. The conductive lithium salt is LiPF 6 , its concentration in the organic solvent is 1.0mol / L; the functional additive is ethylene carbonate (VEC) in an amount of 2wt.%.

[0046] The preparation method of above-mentioned high-voltage lithium-ion battery electrolyte is:

[0047] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0048] (2) Dissolving the conductive lithiu...

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PUM

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Abstract

The invention discloses high-voltage lithium ion battery electrolyte, a preparation method and application of electrolyte. The high-voltage lithium ion battery electrolyte comprises an organic solvent, conductive lithium salt and a functional additive, wherein the organic solvent is prepared from a cyclic carbonate solvent, a fluoro solvent and a linear carbonic ester solvent, the content of the fluoro solvent in the high-voltage lithium ion battery electrolyte is 0.1-40wt.%, the content of the functional additive is 0.01-5wt.%, and the concentration of the conductive lithium salt in the organic solvent is 0.8-1.5mol/L. According to the high-voltage lithium ion battery electrolyte, the interfacial property of the anode and the cathode of the battery and the electrolyte can be improved, and the stability of the electrolyte can be improved, so that the cycle life of the high-voltage lithium ion battery is prolonged, the high-temperature property of the high-voltage lithium ion battery is improved and the working voltage of the high-voltage lithium ion battery is increased to be above 4.5V.

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 electrolyte and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become the fastest-growing and most valued new high-energy batteries because of their advantages such as high specific energy and long cycle life. In recent years, portable electronic devices have developed rapidly, but the increase in hardware configuration, increase in screen size, and diversification of functions have put forward higher and higher requirements for the energy density of lithium-ion batteries. At present, in order to improve the energy density of lithium-ion batteries, researchers mainly develop positive electrode materials with high capacity and high working voltage (greater than 4.2V), such as improving the working voltage of lithium-cobalt composite oxides and lithium-manganese composite oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/058
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/004H01M2300/0042Y02E60/10Y02P70/50
Inventor 李伟善李斌林海斌戎海波许梦清邢丽丹
Owner SOUTH CHINA NORMAL UNIVERSITY
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