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Lithium ion battery electrolyte solution

A lithium-ion battery, electrolyte technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of low temperature performance of lithium batteries, and achieve high voltage resistance performance, high thermal decomposition temperature, and electrical conductivity. high effect

Inactive Publication Date: 2014-07-23
陈琛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above technologies cannot solve the low temperature performance of lithium batteries.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] The production of lithium-ion battery positive electrode sheet: the active material lithium nickel cobalt manganese oxide LiNi 0.5 co 0.2 mn 0.3 o 2 , the conductive agent Super-P, and the binder PVDF were dispersed into N-methyl-2-pyrrolidone according to the mass ratio of 92:4:4, and stirred evenly to obtain the positive electrode slurry. The slurry is evenly coated on both sides of the current collector aluminum foil, dried, cold-pressed, stripped, then vacuum-dried, and the tabs are welded to make a positive electrode sheet of a lithium-ion battery that meets the requirements.

[0025] Production of lithium-ion battery negative plate:

[0026] The active material natural graphite, the conductive agent Super-P, the binder styrene-butadiene rubber SBR, and the binder carboxymethylcellulose sodium CMC are added to the solvent deionized water according to the mass ratio of 96:1.5:1.5:1, and stirred evenly to obtain Negative slurry. The slurry is evenly coated on bo...

Embodiment 2

[0032] A lithium-ion battery fabricated in the same manner as in Example 1 was used. The solvent in the electrolyte is ethylene carbonate (EC), γ-butyrolactone (GBL), and ethyl methyl carbonate (EMC) in a mass ratio of 1:1:3, and the lithium salt is lithium difluorooxalate borate (LiDFOB). The concentration is 0,9mol / L.

Embodiment 3

[0034] A lithium-ion battery fabricated in the same manner as in Example 1 was used. The solvent in the electrolyte is ethylene carbonate (EC), γ-butyrolactone (GBL), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) mixed in a mass ratio of 1:1:1.5:1.5, lithium salt Lithium difluorooxalate borate (LiDFOB), the concentration is 1mol / L.

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Abstract

The invention discloses a lithium ion battery electrolyte solution which comprises a lithium salt and a non-aqueous organic solvent, wherein the lithium salt is a lithium salt A or a mixture of the lithium salt A and a lithium salt B; the lithium salt A contains oxalate groups, and the lithium salt B does not contain oxalate groups; the lithium salt A comprises one or mixture of several of lithium bis(oxalate)borate (LiBOB), lithium difluoroborate (LiDFOB), lithium difluorophosphate (LiDFOP) and lithium tetrafluorophosphate (LiTFOP); the non-aqueous organic solvent is one or mixture of several of common carbonate, carboxylate, ethers, sulfone compounds and the like. Due to the lithium ion battery electrolyte solution, the safety and the high-low-temperature performance of a lithium ion battery can be greatly improved, and the use temperature range of the lithium ion battery can be expanded.

Description

technical field [0001] The invention relates to the technical field of a lithium ion battery electrolyte, and discloses a lithium ion battery electrolyte using a lithium salt containing an oxalate group. Background technique [0002] After decades of research and practice, lithium hexafluorophosphate (LiPF6) is generally selected as the conductive salt for non-aqueous electrolytes currently used in commercial lithium-ion batteries, and the solvents are mostly ethylene carbonate (EC) with high viscosity and high dielectric constant. A mixed solvent composed of propylene carbonate (PC) and low viscosity, low dielectric constant dimethyl carbonate (DMC), diethyl carbonate (DEC), or methyl ethyl carbonate (EMC). This kind of system can be used on a large scale in the end, not because its various indicators have outstanding characteristics, but because its comprehensive indicators can basically meet the industrial application requirements of existing secondary lithium batteries, ...

Claims

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Application Information

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IPC IPC(8): H01M10/0568
CPCH01M10/0525H01M10/0568H01M10/4235H01M2300/0025Y02E60/10
Inventor 陈琛
Owner 陈琛
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