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Method for improving positive aluminum-foil current collector by two-step method and by using phosphoric acid-permanganate

A technology of permanganate and current collector, applied in the direction of electrode carrier/current collector, battery electrode, hybrid capacitor current collector, etc., can solve the problems of high cost, limited effect, complicated preparation process, etc.

Active Publication Date: 2014-06-04
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods of pre-coating graphene and carbon powder on the aluminum foil current collector have limited effects on improving the performance of the positive aluminum foil current collector, and the preparation process is complicated and the cost is high. Therefore, the present invention uses a simple surface treatment method to improve lithium The surface properties of the positive electrode aluminum foil current collector of the ion battery can reduce the impedance between the positive electrode aluminum foil current collector and the positive electrode material of the lithium ion battery, and reduce the powder dropping phenomenon of the positive electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The aluminum foil is respectively passed through an oil removal step and a conversion film formation step to prepare a positive electrode aluminum foil current collector containing a conversion film. The degreasing step is to place the aluminum foil in the degreasing solution for 1 min, and the temperature of the degreasing solution is 65°C. The composition of described degreasing solution is: Na 3 PO 4 · 12H 2 O 25g / L, Na 2 CO 3 58 g / L, octylphenol ethoxylate 3g / L.

[0013] The preparation step of the conversion film is to place the aluminum foil treated in the degreasing step in the permanganate treatment solution, treat it at 85°C for 12 minutes, then rinse it with water, and finally dry it naturally to obtain the positive electrode aluminum foil assembly containing the conversion film. fluid.

[0014] The composition of the permanganate treatment solution is as follows: sodium permanganate 12 g / L, 75 w.t.% phosphoric acid 2 g / L.

[0015] The prepared positi...

Embodiment 2

[0018] The aluminum foil is respectively passed through an oil removal step and a conversion film formation step to prepare a positive electrode aluminum foil current collector containing a conversion film. The degreasing step is to place the aluminum foil in the degreasing solution for 3 min. The temperature of the degreasing solution was 70°C. The composition of described degreasing solution is: Na 3 PO 4 · 12H 2 O 25g / L, Na 2 CO 3 58 g / L, octylphenol ethoxylate 3g / L.

[0019] The conversion film formation step is to place the aluminum foil treated in the degreasing step in the permanganate treatment solution, treat it at 98°C for 30 minutes, then rinse it with water, and finally dry it with hot air at 150°C to obtain the aluminum foil containing The positive electrode aluminum foil current collector of the conversion film.

[0020] The composition of the permanganate treatment solution is as follows: magnesium permanganate 15g / L, 75 w.t.% phosphoric acid 15g / L.

...

Embodiment 3

[0023] The aluminum foil is respectively passed through an oil removal step and a conversion film formation step to prepare a positive electrode aluminum foil current collector containing a conversion film. The degreasing step is to place the aluminum foil in the degreasing solution for 15 seconds, and the temperature of the degreasing solution is 55°C. The composition of described degreasing solution is: Na 3 PO 4 · 12H 2 O 25g / L, Na 2 CO 3 58 g / L, octylphenol ethoxylate 3g / L.

[0024] The preparation step of the conversion film is to place the aluminum foil treated in the degreasing step in the permanganate treatment solution, treat it at 35°C for 1min, then rinse it with water, and finally dry it with hot air at 60°C to obtain a conversion film containing The cathode aluminum foil current collector of the membrane.

[0025] The composition of the permanganate treatment solution is as follows: potassium permanganate 1 g / L, 75 w.t.% phosphoric acid 1 g / L.

[0026] Wh...

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Abstract

The invention relates to a method for improving a positive aluminum-foil current collector by a two-step method and by using phosphoric acid-permanganate. The method is characterized in that an aluminum foil is prepared into the positive aluminum-foil current collector comprising a conversion film through a deoiling step and a conversion film formation step respectively. The conversion film formation step comprises the steps of treating the aluminum foil treated in the deoiling step previously in a permanganate treating fluid within a temperature interval ranging from 35 DEG C to 98 DEG C for 1 to 30 minutes, rinsing thoroughly with water, and finally drying naturally or by virtue of hot air within a temperature interval ranging from 60 DEG C to 150 DEG C, and thereby obtaining the positive aluminum-foil current collector comprising the conversion coating. When being applied to a battery or a super container, the prepared aluminum foil has the advantages of good folding resistance, high adhesion to a positive material, low impedance, excellent charge and discharge performance and the like.

Description

technical field [0001] The invention belongs to the technical field of battery electrode preparation, and in particular relates to a positive electrode aluminum foil current collector containing a conversion film that can be used for lithium batteries, lithium ion batteries, polymer batteries and supercapacitors. technical background [0002] Lithium-ion batteries have the advantages of high battery voltage, high energy density, no memory effect, long cycle life, and low self-discharge. The performance of positive electrode materials plays a decisive role in the performance of lithium-ion batteries. At present, lithium-ion batteries are mainly composed of organic electrolyte (polymer electrolyte), separator, positive electrode, negative electrode, current collector and other components. Due to the weak conductivity of the liquid organic electrolyte (or polymer electrolyte) used in lithium-ion batteries, in order to achieve the high-current charge and discharge performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01G11/86
CPCH01G11/68H01M4/661H01M4/667H01M10/0525Y02E60/10
Inventor 童庆松刘灿培练冲任媛媛潘国涛吕超吴钦缘李秀华
Owner FUJIAN NORMAL UNIV