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Electrode coated with conductive carbon layer on surface and preparation method of electrode

A technology of surface coating and conductive carbon, which is applied in the direction of electrode manufacturing, battery electrodes, non-aqueous electrolyte battery electrodes, etc., which can solve the problems of performance attenuation, insufficient cycle life, and insufficient power characteristics.

Inactive Publication Date: 2016-08-24
NO 63971 TROOPS PLA
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Problems solved by technology

However, when the battery is used in a relatively harsh environment, such as a device that requires high-power discharge, it often faces the problem that the power characteristics are not good enough or the cycle life is not long enough under high-power conditions.
The root cause is that under high power conditions, the battery generally has a large temperature rise, and the electrodes will inevitably react with the electrolyte, resulting in performance attenuation

Method used

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  • Electrode coated with conductive carbon layer on surface and preparation method of electrode
  • Electrode coated with conductive carbon layer on surface and preparation method of electrode

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Embodiment 1

[0019] Lithium iron phosphate is used as the positive electrode active material, according to the mass fraction of lithium iron phosphate 92%, conductive carbon black 4%, polyvinylidene fluoride binder 4% to prepare a slurry, coated on a 20 micron thick aluminum foil set On both sides of the fluid, one side is coated with a thickness of 125 microns, and dried in an oven at 125°C. According to the mass fraction, 45% of activated carbon, 15% of polyvinylidene fluoride binder, and 40% of N-methylpyrrolidone are used to make a slurry, which is coated on both sides of the pole piece prepared above, and the coating thickness on one side is 10 microns. Dry again in an oven at 125°C. After compacting the obtained electrode sheet, the compacted density is 2.05g / cm 3 , to obtain a positive electrode coated with a conductive layer on the surface.

[0020] Graphite is used as the negative electrode active material, and the slurry is prepared according to the mass fraction of graphite 92...

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Abstract

The invention belongs to the field of battery manufacturing and particularly relates to an electrode coated with a conductive carbon layer on the surface. After the electrode is coated, the conductive carbon layer coats the surface of the electrode; and the variety of conductive carbon can be activated carbon, conductive carbon black, a carbon nano tube, graphene, mesoporous carbon, a carbon fiber and the like. The conductive carbon layer coats the surface of the battery electrode, so that the electrode impedance can be greatly reduced; an active material can be effectively protected; the stability of the electrode is improved; and the electrode is especially suitable for the field of application of a high-power battery.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to an electrode coated with a conductive carbon layer on the surface, which can be used to prepare primary and secondary batteries, and is especially suitable for the preparation of power batteries. Background technique [0002] With the advancement of battery technology, batteries are more and more widely used in electric vehicles and high-performance equipment. However, when the battery is used in a relatively harsh environment, such as a device that requires high-power discharge, it often faces the problem that the power characteristic is not good enough or the cycle life is not long enough under high-power usage conditions. The root cause is that under high-power conditions, the battery generally has a large temperature rise, and the electrodes will inevitably react with the electrolyte, resulting in attenuation of performance. Therefore, how to increase the conductivity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M4/139H01M4/04
CPCY02E60/10
Inventor 杨裕生邱景义余仲宝李萌张松通王维坤苑克国王安邦
Owner NO 63971 TROOPS PLA
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