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High-voltage electrolyte solution adaptive to high-energy-density positive electrode material

A high energy density, positive electrode material technology, applied in the field of lithium-ion battery electrolyte, can solve the problems of battery cycle performance decline, internal pressure increase, capacity attenuation, etc., and achieve good cycle and safety performance, and good oxidation resistance.

Inactive Publication Date: 2017-12-29
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte system composed of conventional carbonate solvent and lithium hexafluorophosphate will decompose when it is above 4.5V, resulting in increased internal pressure, increased temperature, decreased battery cycle performance, and rapid capacity decay

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-energy-density positive electrode material suitable for high-voltage electrolytes, consisting of organic solvents, electrolyte lithium salts, positive electrode film-forming additives, and negative electrode film-forming additives;

[0023] The organic solvent is composed of carbonates and fluorinated solvents. The carbonates in the organic solvent are composed of ethylene carbonate, vinyl methyl carbonate and dimethyl carbonate. The volume ratio is 2:4:1. The fluorine in the organic solvent The substitute solvent is fluoroethylene carbonate, and the volume ratio of fluorinated solvent to carbonates is 5:95;

[0024] The electrolyte lithium salt is composed of lithium hexafluorophosphate and lithium difluorooxalate borate, the concentration of the electrolyte lithium salt is 0.9mol / L, wherein the molar percentage of lithium hexafluorophosphate is 10%, and the molar percentage of lithium difluorooxalate borate is 90%;

[0025] The positive electrode film-forming a...

Embodiment 2

[0028] A high-energy-density positive electrode material suitable for high-voltage electrolytes, consisting of organic solvents, electrolyte lithium salts, positive electrode film-forming additives, and negative electrode film-forming additives;

[0029] The organic solvent is composed of carbonates and fluorinated solvents. The carbonates in the organic solvent are composed of ethylene carbonate, vinyl methyl carbonate and dimethyl carbonate. The volume ratio is 2:6:2. The fluorine in the organic solvent The substitute solvent is trifluoromethylethylene carbonate, wherein the volume ratio of fluorinated solvent to carbonates is 15:85;

[0030] The electrolyte lithium salt is composed of lithium hexafluorophosphate and lithium difluorooxalate borate, the concentration of the electrolyte lithium salt is 1.05mol / L, wherein the molar percentage of lithium hexafluorophosphate is 20%, and the molar percentage of lithium difluorooxalate borate is 80%;

[0031] The positive electrode...

Embodiment 3

[0034] A high-energy-density positive electrode material suitable for high-voltage electrolytes, consisting of organic solvents, electrolyte lithium salts, positive electrode film-forming additives, and negative electrode film-forming additives;

[0035] The organic solvent is composed of carbonates and fluorinated solvents. The carbonates in the organic solvent are composed of ethylene carbonate, vinyl methyl carbonate and dimethyl carbonate. The volume ratio is 3:6:2. The fluorine in the organic solvent The substitute solvent is bis(2,2,2-trifluoroethyl) carbonate, and the volume ratio of fluorinated solvent to carbonate is 20:80;

[0036] The electrolyte lithium salt is composed of lithium hexafluorophosphate and lithium difluorooxalate borate, the concentration of the electrolyte lithium salt is 1.2mol / L, wherein the molar percentage of lithium hexafluorophosphate is 30%, and the balance is 70% molar percentage of lithium difluorooxalate borate;

[0037] The positive film-...

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PUM

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Abstract

The invention discloses a high-voltage electrolyte solution adaptive to a high-energy-density positive electrode material; the high-voltage electrolyte solution is composed of an organic solvent, an electrolyte lithium salt, a positive electrode film-forming additive, a negative electrode film-forming additive and the like, wherein the organic solvent is composed of carbonate and a fluorinated solvent, the electrolyte lithium salt is composed of lithium hexafluorophosphate and lithium oxalyldifluoroborate, the positive electrode film-forming additive is composed of tri(hexafluorisopropyl) phosphate and a nitrile additive, and the negative electrode film-forming additive is composed of 1,3-propyl-sultone and vinylethylene carbonate. The high-voltage electrolyte solution provided by the invention can be applicable to 4.5-5.0 V charging voltage, and has good oxidation resistance, high-temperature resistance and safety characteristics. A high-energy-density battery adopting the electrolyte solution has good cycle and safety performance under high voltage and high temperature.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a high-energy-density cathode material adapted to a high-voltage electrolyte. Background technique [0002] Lithium-ion battery is a secondary battery that relies on the migration of lithium ions between the positive and negative electrodes. Lithium-ion battery has a high energy density and is a high-capacity and efficient secondary battery. The pursuit of higher energy density is an important development direction of lithium-ion batteries, but a bottleneck in the development of high-energy-density lithium-ion batteries is a high-voltage electrolyte that matches the electrode materials of high-energy lithium-ion batteries. At present, the conventional carbonate electrolyte system is mainly based on 4.2V. For high-energy-density positive electrode materials, an electrolyte that can withstand a higher voltage system is required, which is sufficient for the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/42
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M2300/0025H01M2300/0034H01M2300/0037Y02E60/10
Inventor 严红石先兴王慧敏
Owner WANXIANG 123 CO LTD
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