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Treatment technology for lithium ion battery current collector with conductive polymer film on surface

A conductive polymer and lithium-ion battery technology, applied in battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve the problems of reduced capacity, adhesive dosage, battery performance contradictions, attenuation, etc., and achieve increased peel strength , Realize large-scale production and reduce the effect of dosage

Active Publication Date: 2014-08-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of the contradiction between the amount of adhesive and the performance of the battery in the preparation process of the lithium-ion battery pole piece in the above-mentioned prior art, and at the same time reduce the capacity fading caused by the corrosion of the current collector metal by the decomposition product of the electrolyte

Method used

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  • Treatment technology for lithium ion battery current collector with conductive polymer film on surface
  • Treatment technology for lithium ion battery current collector with conductive polymer film on surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Electrochemical deposition of polyaniline film on the surface of positive electrode current collector aluminum foil by cyclic voltammetry

[0020] a. Dissolve the aniline monomer into the acidic solution, and control the aniline concentration to 0.05mol L -1 , adjust the pH of the solution to 4.0 to obtain a supporting electrolyte, and control the temperature at -5 to 5°C.

[0021] b. The aluminum foil of the positive electrode collector of the lithium-ion battery is ultrasonically cleaned by acetone, ethanol and deionized water in sequence, and dried for later use.

[0022] c. In the electrolytic cell, immerse the lithium-ion battery cathode current collector aluminum foil treated in step b into the supporting electrolyte as the working electrode, and use cyclic voltammetry as the electrochemical deposition method. The specific electrochemical parameters are: scanning potential -0.5~1.6V SCE (relative to saturated calomel electrode, SCE), scan rate 10mV s -1 , the nu...

Embodiment 2

[0024] Electrochemical deposition of polyaniline film on the surface of negative electrode current collector copper foil by galvanostatic method

[0025] a. Dissolve the aniline monomer into the acidic solution, and control the aniline concentration to 0.05mol L -1 , adjust the pH of the solution to 4.0 to obtain a supporting electrolyte, and control the temperature at -5 to 5°C.

[0026] b. The copper foil of the negative electrode collector of the lithium-ion battery is ultrasonically cleaned by acetone, ethanol and deionized water in sequence, and dried for later use.

[0027] c. In the electrolytic cell, immerse the lithium-ion battery negative electrode current collector copper foil treated in step b into the supporting electrolyte as the working electrode, and use the constant current method as the electrochemical deposition method. The specific electrochemical parameters are: current density 0.05mA cm -2 , the synthesis time is 10s. After deposition, wash and dry with...

Embodiment 3

[0029] Electrochemical deposition of polypyrrole film on the surface of positive electrode current collector aluminum foil by galvanostatic method

[0030] a. Dissolve the pyrrole monomer into the acidic solution, and control the pyrrole concentration to 0.1mol L -1 , adjust the pH of the solution to 5.5 to obtain a supporting electrolyte, and control the temperature at -5 to 5°C.

[0031] b. The aluminum foil of the positive electrode collector of the lithium-ion battery is ultrasonically cleaned by acetone, ethanol and deionized water in sequence, and dried for later use.

[0032] c. In the electrolytic cell, immerse the lithium-ion battery cathode current collector aluminum foil treated in step b into the supporting electrolyte as the working electrode, and use the constant current method as the electrochemical deposition method. The specific electrochemical parameters are: current density 0.35mA cm -2 , the synthesis time is 20s. After deposition, it is washed and dried ...

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Abstract

The invention discloses a treatment technology for a lithium ion battery current collector with a conductive polymer film on a surface, relating to the technical field of lithium ion battery manufacturing. The treatment technology comprises the steps of dissolving a conductive polymer monomer into acidic liquid to obtain supporting electrolyte, enabling the supporting electrolyte to permeate into the lithium ion battery current collector subjected to surface cleaning so as to be used as a working electrode, and depositing a conductive polymer film layer which is 0.5-2 microns thick on the surface of the lithium ion battery current collector by regulating corresponding electrochemical parameters by an electrochemical method. The deposited conductive polymer film layer of the lithium ion battery current collector is uniform and compact, is firmly adhered to substrate metal, and is high in bonding force with an active substance; the peeling strength of the active substance can be enhanced, the using amount of an adhesive is reduced, and the contact internal resistance is reduced. The conductive polymer film layer is high in corrosion resistance so as to effectively prevent corrosion of the electrolyte to the current collector; meanwhile, due to the excellent conductivity, side effects on the charging and discharging performance of the battery are avoided. The equipment is simple and is convenient to control, treatment can be realized at normal temperature, and large-scale production can be realized.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a treatment process for a current collector of a lithium-ion battery with a conductive polymer film on its surface. Background technique [0002] Due to its high energy density, low self-discharge and other excellent characteristics, lithium-ion batteries will replace nickel / hydrogen and nickel / cadmium batteries in the fields of automotive power supplies, 3C electronic products, and energy storage devices. The expansion of the application range puts forward higher requirements for lithium batteries, and the development of high-energy, high-rate and long-life lithium batteries has become the ultimate goal. [0003] The preparation process of lithium battery pole piece is to dissolve a certain proportion of active material (positive or negative electrode), binder (polyvinylidene fluoride PVDF or styrene-butadiene rubber SBR) and conductive agent into a sui...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/04
CPCH01M4/0457H01M4/667H01M10/0525Y02E60/10
Inventor 汪涛彭文王启岁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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