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Ionic liquid mixed electrolyte for lithium ion battery

A lithium ion battery and ionic liquid technology, applied in the field of ionic liquid mixed electrolyte, can solve the problems of low solubility and limited application, and achieve the effects of good compatibility, improved electrical conductivity and improved electrochemical stability

Inactive Publication Date: 2013-05-08
JIANGXI YOULI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fatal disadvantage of LiBOB and LiDFOB is their low solubility in traditional non-aqueous organic solvents, which limits their application in lithium-ion battery electrolytes.

Method used

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  • Ionic liquid mixed electrolyte for lithium ion battery
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  • Ionic liquid mixed electrolyte for lithium ion battery

Examples

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Effect test

Embodiment 1

[0022] LiBOB was used as lithium salt, 1-ethyl, 3-methylimidazolium bis(fluoroxanyl)imide was used as ionic liquid, and EC / DMC was used as non-aqueous organic solvent. The concentration of LiBOB was 0.6 mol / L, EC and The volume ratio of DMC is 3:7, the volume ratio of ionic liquid and non-aqueous organic solvent is 5:5, in a dry glove box filled with high-purity argon (H 2 O 2 + ), with a conductivity of 10.2 ms / cm (25°C).

Embodiment 2

[0024] LiDFOB is used as lithium salt, 1-propyl, 3-methylimidazolium bis(trifluoromethylxanthyl)imide is used as ionic liquid, EC / EMC is used as non-aqueous organic solvent, and the concentration of LiDFOB is 0.8 mol / L , the volume ratio of EC to EMC is 5:5, the volume ratio of ionic liquid to non-aqueous organic solvent is 4:6, in a dry glove box filled with high-purity argon (H 2 O 2 + ), with a conductivity of 9.7 ms / cm (25°C).

Embodiment 3

[0026] LiBOB was used as lithium salt, 1-butyl, 3-methylimidazolium bis(trifluoromethylxanthyl)imide was used as ionic liquid, EC / DEC was used as non-aqueous organic solvent, and the concentration of LiBOB was 0.8 mol / L. The volume ratio of EC to DEC is 4:6, and the volume ratio of ionic liquid to non-aqueous organic solvent is 6:4. In a dry glove box filled with high-purity argon (H 2 O 2+ ), with a conductivity of 8.1 ms / cm (25°C).

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Abstract

The invention discloses an ionic liquid mixed electrolyte for a lithium ion battery. The ionic liquid mixed electrolyte comprises lithium salt, ionic liquid and a non-aqueous organic solvent, wherein the lithium salt is one or mixture of two of lithium bis borate and lithium difluoroborate; cations in the ionic liquid are selected from one of imidazole cations, piperidine cations, pyridine cations, pyrrole cations, quaternary ammonium cations and quaternary phosphine cations; anions in the ionic liquid are selected from one of tetrafluoroborate radicals, hexafluorophate radicals, difluorosulfimide anions and diperfluoroalkylsulfimide anions; and the non-aqueous organic solvent is selected from any one or mixture of several of linear carbonate, cyclic carbonate, linear ether and cyclic ether. The ionic liquid mixed electrolyte is high in thermal stability, wide for an electrochemical stability window, high in conductivity, low in viscosity and good in compatibility with an anode material and a cathode material of the lithium ion battery at the same time.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrolytes, and more specifically relates to an ionic liquid mixed electrolyte in which lithium dioxalate borate and lithium difluorooxalate borate serve as lithium salt, and a mixture of ionic liquid and non-aqueous organic solvent serves as solvent. Background technique [0002] Electrolyte is an important part of lithium-ion batteries. It plays the role of transmitting lithium ions and conducting current. It is a bridge connecting the positive and negative electrode materials. The energy stored in the negative electrode is released. The traditional lithium-ion battery electrolyte is composed of lithium hexafluorophosphate as lithium salt and non-aqueous organic solvent as solvent. It has the disadvantages of being sensitive to trace moisture, HF acid, high vapor pressure, poor high temperature resistance, and flammability. There are serious problems. safe question. In recent years, lithiu...

Claims

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Application Information

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IPC IPC(8): H01M10/056
CPCY02E60/12Y02E60/10
Inventor 颜果春王超齐爱李雪铖徐斌王任衡
Owner JIANGXI YOULI NEW MATERIALS
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