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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the above technologies cannot solve

Method used

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  • Lithium ion battery electrolyte solution
  • Lithium ion battery electrolyte solution

Examples

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Example Embodiment

[0023] Example 1

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

[0025] Production of lithium ion battery negative sheet:

[0026] Add the active material natural graphite, the conductive agent Super-P, the binder styrene butadiene rubber SBR, and the binder sodium carboxymethyl cellulose CMC into the solvent deionized water at a mass ratio of 96:1.5:1.5:1, and stir evenly to obtain Negative slurry. The slurry is evenly coated on both sides of the current collector copper foil, dried, cold pr...

Example Embodiment

[0031] Example 2

[0032] A lithium ion battery made by the same method as in Example 1. 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. The lithium salt is lithium difluorooxalate (LiDFOB), The concentration is 0,9mol / L.

Example Embodiment

[0033] Example 3

[0034] A lithium ion battery made by the same method as in Example 1. The solvent in the electrolyte is ethylene carbonate (EC), gamma-butyrolactone (GBL), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) mixed in a mass ratio of 1:1:1.5:1.5, lithium salt It is lithium difluorooxalate borate (LiDFOB) with a concentration of 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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