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Lithium ion battery electrolyte and lithium ion battery containing same

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion battery electrolyte and lithium-ion batteries containing the electrolyte, can solve problems such as loss of stability, reduced battery capacity and cycle life, and reduced battery safety. Improve cycle performance and safety, prevent excessive insertion of negative electrodes, and slow down the effect of battery inflation

Inactive Publication Date: 2017-02-22
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The decomposition of the electrolyte at the positive and negative electrodes of the battery will generate gas, which will increase the internal pressure of the battery, accumulate heat inside and lose stability, especially at high temperature and high voltage, which will seriously affect the cycle life and safety of the battery.
With the improvement of market requirements, it is increasingly urgent to improve the performance of lithium-ion batteries. The key to improving capacity and safety is to solve the problems existing in commercial electrolytes. A large number of decomposition products will increase the battery impedance and irreversible capacity; the gas generated will be reduced. Battery safety; the dissolution of positive transition metals deteriorates the positive and negative materials of the battery, reducing battery capacity and cycle life

Method used

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  • Lithium ion battery electrolyte and lithium ion battery containing same
  • Lithium ion battery electrolyte and lithium ion battery containing same
  • Lithium ion battery electrolyte and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of electrolyte

[0028] In a glove box filled with argon (moisture content < 0.1ppm, oxygen content < 0.1ppm), mix ethylene carbonate and diethyl carbonate in a mass ratio of 1:2 and stir continuously, slowly add to the mixed solvent Add 1.0 mol / L lithium hexafluorophosphate, then add 2.0% vinylene carbonate, 1.0% succinonitrile, and 1.0% 2-phenylpyridine, and stir until completely dissolved to obtain the electrolyte solution of this example .

[0029] (2) Preparation of lithium ion battery:

[0030] LiCoO 2 It is used as the positive electrode active material, and graphite is used as the negative electrode active material. After adding conductive agent, binder and solvent, they are fully stirred and mixed evenly. The positive and negative pole pieces and the polypropylene separator are wound into a square lithium-ion battery. After baking at 85°C for 48 hours, it was transferred to a glove box for liquid injection, and after sealing, it was aged, fo...

Embodiment 2

[0032] (1) Preparation of electrolyte

[0033] In a glove box filled with argon (moisture content < 0.1ppm, oxygen content < 0.1ppm), mix ethylene carbonate and diethyl carbonate in a mass ratio of 1:3 and stir continuously, slowly add to the mixed solvent Add 1.2mol / L lithium hexafluorophosphate, then add 3.0% fluoroethylene carbonate, 0.5% ethylene carbonate, and 2.0% 2-(4-methylphenyl)pyridine, and stir until completely dissolved , to obtain the electrolyte solution of this embodiment.

[0034] (2) Preparation of lithium ion battery

[0035] Take LiNi 0.8 co 0.15 al 0.05 o 2 It is used as the positive electrode active material, and graphite is used as the negative electrode active material. After adding conductive agent, binder and solvent, they are fully stirred and mixed evenly. The positive and negative pole pieces and the polypropylene separator are wound into a square lithium-ion battery. After baking at 85°C for 48 hours, it was transferred to a glove box for l...

Embodiment 3

[0037] (1) Preparation of electrolyte

[0038] In a glove box filled with argon (moisture content < 0.1ppm, oxygen content < 0.1ppm), mix ethylene carbonate and ethyl methyl carbonate in a mass ratio of 1:1 and stir continuously, slowly add to the mixed solvent Add 1.0mol / L lithium hexafluorophosphate, then add 1.5% 1,3-propane sultone, 2.0% ethylene carbonate, 3.0% 2-(2,4-difluorophenyl) Pyridine was stirred until completely dissolved to obtain the electrolyte solution of this embodiment.

[0039] (2) Preparation of lithium ion battery

[0040] Take LiNi0.5 mn 0.3 co 0.2 o 2 It is used as the positive electrode active material, and graphite is used as the negative electrode active material. After adding conductive agent, binder and solvent, they are fully stirred and mixed evenly. The positive and negative pole pieces and the polypropylene separator are wound into a square lithium-ion battery. After baking at 85°C for 48 hours, it was transferred to a glove box for liqu...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. The electrolyte comprises organic solvents, conductive lithium salts, additives and phenylpyridine compounds. According to the invention, a solid electrolyte protective film formed by the phenylpyridine compounds can inhibit decomposition of the electrolyte, reduce the battery impedance, and slow down the battery gas expansion speed under the condition of high temperature and high pressure, and further can inhibit the dissolution of transition metals, prevent the transition metals from being embedded into cathodes and protect battery anode and cathode materials to greatly improve cycle performances and safety performances of electrodes.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] In recent years, lithium-ion secondary batteries with high energy density have been fully developed and applied. Compared with other rechargeable batteries, lithium-ion secondary batteries have the advantages of high energy density, high working voltage, long cycle life, low self-discharge, and environmental protection. At present, lithium-ion secondary batteries have good application prospects in portable 3C electronic devices such as mobile phones and notebook computers, and large-rate power batteries. [0003] The non-aqueous electrolyte, which is the key material of the lithium secondary battery, is an ionic conductor that conducts electricity between the positive and negative electrodes of the battery, and it itself largely affects the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 范伟贞余乐林乙龙谢添张利萍
Owner GUANGZHOU TINCI MATERIALS TECH
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