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Electrolyte additive and application thereof

An electrolyte additive and additive technology, which is applied in the field of lithium-ion batteries, can solve the problems of battery rate and cycle performance attenuation, lithium ion migration and diffusion kinetics, and interface impedance increase, etc., to improve rate performance and cycle stability. And safety performance, the effect of suppressing side effects

Inactive Publication Date: 2015-04-29
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These additives can form a film on the positive electrode, but it will increase the interfacial impedance, resulting in a decrease in the kinetics of lithium ion migration and diffusion in the battery, which in turn will reduce the rate and cycle performance of the battery.

Method used

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  • Electrolyte additive and application thereof
  • Electrolyte additive and application thereof
  • Electrolyte additive and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Positive plate P1 # preparation of

[0064] The positive electrode active material lithium cobaltate (molecular formula LiCoO 2 ), conductive agent (the mass percentage of carbon nanotube CNT in the conductive agent is 6%, and the mass percentage of conductive carbon black is 94%), binder polyvinylidene fluoride (abbreviated as PVDF, binder The mass percentage of polyvinylidene fluoride is 7%) is uniformly dispersed in the solvent N-methylpyrrolidone (abbreviated as NMP) to prepare positive electrode slurry. The solid content in the positive electrode slurry is 77wt%, and the solid component contains 98.26wt% lithium cobalt oxide, 0.9% PVDF and 0.84wt% conductive agent. Coat the positive electrode slurry evenly on the positive electrode current collector aluminum foil with a thickness of 12 μm, and the coating amount on one side is 0.0215 g / cm 2 . After drying at 85°C, cold press, edge trimming, cutting, and slitting were carried out, and then dried under vacuu...

Embodiment 2

[0074] Electrolyte L2 # preparation of

[0075] with electrolyte L1 # The preparation method is the same, the difference is that the mass percentage of the additive 2-methyl-2,3-dihydrothieno[3,4-b][1,4]dioxane is changed from 1% to 0.1%, the resulting electrolyte is denoted as L2 # .

[0076] Lithium-ion secondary battery C2 # preparation of

[0077] With lithium-ion secondary battery C1 # The preparation method is the same, the difference is that the electrolyte is changed to L2 # , the resulting lithium-ion secondary battery is denoted as C2 # .

Embodiment 3

[0079] Electrolyte L3 # preparation of

[0080] with electrolyte L1 # The preparation method is the same, the difference is that the mass percentage of the additive 2-methyl-2,3-dihydrothieno[3,4-b][1,4]dioxane is changed from 1% to 3%, the resulting electrolyte is denoted as L3 # .

[0081] Lithium-ion secondary battery C3 # preparation of

[0082] With lithium-ion secondary battery C1 # The preparation method is the same, the difference is that the electrolyte is changed to L3 # , the resulting lithium-ion secondary battery is denoted as C3 # .

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Abstract

The invention discloses an electrolyte additive and an apparition thereof. The additive contains a thiophene compound. The additive, which is used for a lithium ion battery, is capable of inhibiting the continuous electrochemical oxidation reaction of the electrolyte and the anode material, improving the electric conductivity of the anode material, improving the cycle performance and the high current discharge performance of the battery, and improving the safety performance and the rate performance of the battery.

Description

technical field [0001] The application belongs to the field of batteries, and in particular relates to a non-aqueous electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] With the rapid development of the information age, the demand for electronic products is increasing year by year. Lithium-ion batteries have the characteristics of high energy density, no memory effect, high working voltage and wide application temperature range. They have been widely used in mobile phones, notebooks, cameras and other electronic products, and are gradually replacing traditional Ni-Cd, MH-Ni Batteries, become the main chemical power source. [0003] With the expansion of market demand for electronic products and the development of power and energy storage equipment, people's requirements for lithium-ion batteries continue to increase. The development of lithium-ion batteries with high energy, long life, fast charge and discharge, and high safety has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567C07D495/04H01M2300/0025Y02E60/10
Inventor 陈培培龙兵王可飞
Owner NINGDE AMPEREX TECH
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