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Preparation method of carbon-coated aluminum foil

A technology of carbon-coated aluminum foil and aluminum foil, which is applied in the field of lithium-ion batteries, can solve the problems of poor performance of carbon-coated aluminum foil, affecting battery performance, and large amount of conductive paste, so as to increase conductivity, improve cycle performance, and reduce surface density. Effect

Inactive Publication Date: 2018-02-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, carbon-coated aluminum foil is usually prepared by coating conductive paste on aluminum foil, but the amount of conductive paste is large, and the performance of carbon-coated aluminum foil is not very good, which affects the performance of the prepared battery

Method used

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Examples

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Effect test

Embodiment 1

[0020] A method for preparing carbon-coated aluminum foil, comprising the steps of: loading conductive paste into an electrospinning device, adjusting the electrospinning voltage to 8kV, and the solution flow rate to 0.8mL·h -1 , the distance between the electrospinning nozzle and the aluminum foil is 10 cm, the aluminum foil is sprayed, and then dried to obtain the carbon-coated aluminum foil.

Embodiment 2

[0022] A method for preparing carbon-coated aluminum foil, comprising the steps of: loading a conductive slurry with a solid content of 10wt% and a viscosity of 100mPa·S into an electrospinning device, adjusting the electrospinning voltage to 1kV, and the solution flow rate to 1.5mL·h -1 , the distance between the electrospinning nozzle and the aluminum foil is 1cm, the aluminum foil is sprayed, and then dried to obtain a carbon-coated aluminum foil, wherein the raw materials of the conductive paste include: acetylene black, acrylonitrile binder and isopropanol.

Embodiment 3

[0024] A method for preparing carbon-coated aluminum foil, comprising the steps of: loading a conductive slurry with a solid content of 25wt% and a viscosity of 20mPa·S into an electrospinning device, adjusting the electrospinning voltage to 15kV, and the solution flow rate to 0.1mL·h -1 , the distance between the electrospinning nozzle and the aluminum foil is 20cm, the aluminum foil is sprayed, and then dried to obtain a carbon-coated aluminum foil, wherein the raw materials of the conductive paste include: graphite, carbon nanotubes, acrylate binder, ethanol, propanol .

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Abstract

The invention discloses a preparation method of a carbon-coated aluminum foil. The preparation method comprises the following steps of loading conductive paste into an electrostatic spinning apparatus; adjusting the electrostatic spinning voltage to be 1-15kv, solution flowing speed to be 0.1-1.5mL.h<-1>, and the distance between an electrostatic spinning sprayer and the aluminum foil to be 1-20cm, and then performing spraying on the aluminum foil; and next, performing drying to obtain the carbon-coated aluminum foil. The preparation method is simple in operation, less in conductive paste dosage and capable of realizing uniform distribution of the conductive paste on the aluminum foil; and by virtue of the carbon-coated aluminum foil prepared in the invention, the battery internal resistance can be lowered while the battery energy density and cycle performance can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of carbon-coated aluminum foil. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, long cycle life, no memory effect, safety, reliability, and fast charging and discharging, so they have become a research hotspot. Aluminum foil current collectors play the role of attaching active materials and conducting electrons in lithium batteries. The particle size of the positive electrode active material of the lithium battery is relatively large, so that the contact between the particle and the current collector is a point-to-surface contact, which reduces the conduction path of electrons, thereby increasing the resistance. [0003] Carbon-coated aluminum foil is to uniformly and finely coat the dispersed nano-conductive graphite and carbon black particles on the surface of the aluminum foil. This coat...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 杨亚冬陈萌代北北张壁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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