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A kind of flame-retardant lithium-ion battery electrolyte and lithium-ion battery containing the electrolyte

A lithium ion battery and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of inability to further improve battery cycle performance, poor electrode compatibility, low conductivity, etc., and achieve less additive dosage, good flame retardant effect, and electrical conductivity. high effect

Active Publication Date: 2022-05-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flame retardants reported so far have not fully met the needs of use, or have high viscosity, low conductivity, poor compatibility with electrodes, or high dosage, which can only maintain the cycle performance without attenuation, and cannot further improve Battery Cycle Performance

Method used

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  • A kind of flame-retardant lithium-ion battery electrolyte and lithium-ion battery containing the electrolyte
  • A kind of flame-retardant lithium-ion battery electrolyte and lithium-ion battery containing the electrolyte
  • A kind of flame-retardant lithium-ion battery electrolyte and lithium-ion battery containing the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of Electrolyte 1 and Experimental Cell 1

[0030] (1) Preparation of cathode material

[0031] Mix the cathode active material NCM622, conductive agent carbon nanotubes, and binder PVDF according to the mass ratio of NCM622, carbon nanotubes, and PVDF to 95:3:2, and add N-methylpyrrolidone to make positive electrode slurry. The slurry was coated on an aluminum foil with a thickness of 14 microns, and rolled after drying to obtain the positive electrode material.

[0032] (2) Preparation of negative electrode materials

[0033] Mix the anode active material silicon material, conductive agent acetylene black, and binder SBR according to the mass ratio of silicon material, acetylene black, and SBR to 85:10:5, add deionized water to make negative electrode slurry, and then make the negative electrode slurry The material is coated on a copper foil with a thickness of 7 microns, and rolled after drying to obtain the negative electrode material.

[0034] (3) Pre...

Embodiment 2

[0040] Preparation of Electrolyte 2 and Experimental Battery 2

[0041] The difference from Example 1 is that the electrolyte solution 2 includes the following components in mass percentage: 14% lithium hexafluorophosphate, 1% fluorine-containing hydrocarbyl nitrogen phosphoric acid ester a, 1% fluoroethylene carbonate, and 84% organic solvent.

Embodiment 3

[0043] Preparation of Electrolyte 3 and Experimental Battery 3

[0044] The difference from Example 1 is that the electrolyte solution 3 includes the following components in mass percentage: 14% lithium hexafluorophosphate, 2% fluorine-containing hydrocarbyl azophosphoric acid ester a, 1% fluoroethylene carbonate, and 83% organic solvent.

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Abstract

The invention discloses a flame-retardant lithium-ion battery electrolyte, which comprises lithium salt, an organic solvent, a fluorine-containing hydrocarbon-based nitrogen phosphoric acid ester flame retardant and a film-forming additive. The invention also discloses a lithium ion battery containing the electrolytic solution. Compared with traditional cyclic phosphazenes and polymer polyphosphazenes, the fluorine-containing hydrocarbon-based phosphoronitrogen ester flame retardants used in the present invention have lower viscosity, higher electrical conductivity, less additives, and better flame retardant effect , in an environment with a small dosage, both flame retardancy and electrochemical performance can be achieved. Due to the introduction of cyano groups, when the dosage is further increased within an appropriate range, it is also conducive to improving the cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a flame-retardant lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] Due to its high operating voltage, high specific energy density, long cycle life, and environmental friendliness, lithium-ion batteries have become one of the indispensable and important chemical energy sources in the fields of electronic digital, electric vehicles, energy storage applications, aerospace and other fields. Electrolyte is an important part of lithium-ion batteries. It is called the "blood" of lithium-ion batteries. It is usually composed of lithium salts, solvents and additives. It has an important impact on the cycle performance, rate performance and safety performance of lithium-ion batteries. . Since the current commercial electrolyte is mainly dominated by carbonate organic solvents, although it can guarantee the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 沈剑张健赵坤梁大宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY