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Highly safe electrolyte of lithium battery

A high-safety, electrolyte-based technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., to achieve the effects of inhibiting peeling, good flame retardant effect, and good electrochemical stability

Inactive Publication Date: 2015-03-04
HEFEI CAIXIANG INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a high-safety electrolyte for lithium batteries, fully utilize the advantages of trimethyl phosphite with low viscosity and good flame-retardant effect, and solve the safety problem of lithium-ion batteries

Method used

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Examples

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Embodiment 1

[0010] A high-safety electrolyte for lithium batteries, consisting of lithium salt LiPF6, flame retardant trimethyl phosphite and organic solvent propylene carbonate, wherein LiPF6 accounts for 20% of the electrolyte, and trimethyl phosphite accounts for 20% of the electrolytic solution. The mass ratio of the liquid is 40%, and the mass ratio of propylene carbonate to the electrolyte is 40%.

[0011] Electrochemical analysis shows that using the flame retardant trimethyl phosphite as a co-solvent for the electrolyte of lithium-ion batteries, the positive half-cell has good electrochemical performance; Acrylate exfoliation of graphite has a more obvious inhibitory effect; through microcalorimeter experiments, it is shown that the electrolyte containing the flame retardant trimethyl phosphite can significantly improve the thermal stability of the corresponding electrolyte. After 190 °, the electrolyte There is no obvious exothermic peak of the commercial electrolyte.

Embodiment 2

[0013] A high-safety electrolyte for lithium batteries, consisting of lithium salt LiPF6, flame retardant trimethyl phosphite, and organic solvent propylene carbonate, wherein LiPF6 accounts for 30% of the electrolyte, and trimethyl phosphite accounts for 30% of the electrolyte. The mass ratio of the liquid is 35%, and the mass ratio of propylene carbonate to the electrolyte is 35%.

[0014] Electrochemical analysis shows that using the flame retardant trimethyl phosphite as a co-solvent for the electrolyte of lithium-ion batteries, the positive half-cell has good electrochemical performance; Acrylate exfoliation of graphite has a more obvious inhibitory effect; through microcalorimeter experiments, it is shown that the electrolyte containing the flame retardant trimethyl phosphite can significantly improve the thermal stability of the corresponding electrolyte. After 190 °, the electrolyte There is no obvious exothermic peak of the commercial electrolyte.

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Abstract

The invention relates to a highly safe electrolyte of a lithium battery. The highly safe electrolyte comprises a lithium salt, a flame retardant and an organic solvent, the lithium salt is LiPF6, the flame retardant is trimethyl phosphite, the organic solvent is propylene carbonate, and a weight ratio of the flame retardant to the organic solvent is 1:1. The highly safe electrolyte of the lithium battery has very good compatibility with a positive material, has good electrochemical stability, inhibits the peeling of propylene carbonate to a negative graphite material, fully utilizes of the advantages of small viscosity and good flame retardation effect of trimethyl phosphate, and solves the safety problem of lithium ion batteries.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte, in particular to a lithium battery high-safety electrolyte. Background technique [0002] Safety issues are an important prerequisite for the development of the lithium-ion battery market, especially the application of lithium-ion batteries in electric bicycles, electric vehicles and other fields, which put forward higher and newer requirements for the safety of lithium-ion batteries. The traditional organic carbonate electrolyte has great potential safety hazards. The electrolyte solvent uses volatile and flammable organic carbonate. When the lithium-ion battery is abused or heated, the lithium-ion battery will locally produce an explosion. The high temperature, the solvent is easy to decompose, and releases flammable gases such as CH4, CO, etc. The electrolyte participates in almost all reactions that occur inside the battery, including not only the interaction between the electrolyte and th...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235Y02E60/10
Inventor 薛士凯
Owner HEFEI CAIXIANG INFORMATION TECH
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