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Method for electrolyzing nickel hydroxide covering hydroxyl cobalt oxide layer

A technology of cobalt oxyhydroxide and nickel hydroxide, applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., which can solve the problems of difficult control of product oxidation degree, unfriendly environment, nickel hydroxide peroxidation, etc.

Inactive Publication Date: 2008-02-06
HENAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent application No. 200510048557.3 discloses a method for preparing CoOOH-coated nickel hydroxide by chemical oxidation. In this method, the oxidation degree of the product is not easy to control, and it is easy to cause the phenomenon of nickel hydroxide overoxidation. In addition, due to the use of chemical oxidants, the environment unfriendly

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  • Method for electrolyzing nickel hydroxide covering hydroxyl cobalt oxide layer

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Comparison scheme
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Embodiment 1

[0015] A titanium-based lead dioxide electrode (10cm×5cm) was used as the anode, and stainless steel was used as the cathode, which were respectively placed in the anode chamber and cathode chamber separated by an alkaline battery diaphragm, and 20g of coated Co(OH) 2 Ni(OH) 2 Add 400ml of 3MKCl solution into the anode chamber of the electrolytic cell, adjust its pH value to 13 with NaOH, and then carry out electrolysis with constant voltage under stirring. Filter, wash, and dry at 60°C for 6 hours to obtain the sample of the present invention.

[0016] Table 1. Oxidation degree of different electrolysis time

[0017] Electrolysis time

Embodiment 2

[0019] A titanium-based ruthenium dioxide electrode (10cm×5cm) was used as the anode, and a titanium sheet was used as the cathode, respectively placed in the anode chamber and the cathode chamber separated by an alkaline battery diaphragm, and 20g of coated Co(OH) 2 Ni(OH) 2 Add 400ml of 5MKCl solution to the anode chamber of the electrolytic cell, adjust its pH value to 11 with NaOH, and then carry out electrolysis with constant voltage under stirring. The product was filtered, washed, and dried at 80° C. for 5 hours to obtain the sample of the present invention.

[0020] Table 2. Oxidation degree of different electrolysis time

[0021] Electrolysis time

Embodiment 3

[0023] A titanium-based iridium dioxide electrode (10cm×5cm) was used as the anode, and a nickel sheet was used as the cathode, respectively placed in the anode chamber and the cathode chamber separated by an alkaline battery diaphragm, and 20g of coated Co(OH) 2 Ni(OH) 2 Add 400ml of 3M NaCl solution to the anode chamber of the electrolytic cell, adjust its pH value to 13 with KOH, and then carry out electrolysis with constant voltage under stirring. The product was filtered, washed, and dried at 100° C. for 4 hours to obtain the sample of the present invention.

[0024] Table 3. Oxidation degree of different electrolysis time

[0025] During electrolysis

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Abstract

The present invention discloses a method for electrolyzing nickel hydroxide coated with a hydroxyl cobalt oxide layer. The object of the present invention is to provide a method for electrolyzing nickel hydroxide coated with a hydroxyl cobalt oxide layer with high oxidation efficiency, easy oxidation content control and environment friendliness. The technical proposal of the present invention is that the method for electrolyzing nickel hydroxide coated with a hydroxyl cobalt oxide layer comprises: dividing an electrolytic cell into an anode chamber and a cathode chamber through a diaphragm used in a lithium iron battery or an alky battery; placing an anode made of titanium-based lead dioxide and a cathode made of inert material respectively into the anode chamber and the cathode chamber that are arranged with alky electrolytic solution of alkali chlorides; adding Ni(OH)2 coated with Co(OH)2 into the anode chamber and adjusting the system to be alky with NaOH, then nickel hydroxide of hydroxyl cobalt oxide layer is produced by electrolysis under 1.5-10V constant voltage, at room temperature and with agitation. The present invention is used for preparing of secondary alky batteries.

Description

Technical field: [0001] The invention relates to an electrolytic oxidation method, in particular to a method for electrolyzing nickel hydroxide coated with a cobalt oxyhydroxide layer. Background technique: [0002] At present, nickel hydroxide is widely used as a positive electrode active material in the field of secondary alkaline batteries such as cadmium-nickel batteries, hydrogen-nickel batteries, and zinc-nickel batteries. However, since nickel hydroxide is a P-type semiconductor with poor conductivity, it is necessary to add an appropriate amount of nickel powder, cobalt powder or cobalt oxide as a conductive agent during the electrode production process. However, limited by the mixing process conditions and the characteristics of the material itself, it is impossible to ensure the uniform formation of a CoOOH conductive layer on the surface of nickel hydroxide, which affects the utilization of active materials. In order to effectively form a conductive layer of coba...

Claims

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Application Information

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IPC IPC(8): C25D11/00B22F1/02H01M4/04H01M4/52
CPCY02E60/12Y02E60/10
Inventor 常照荣上官恩波吴锋汤宏伟程迪徐拥军尹正中
Owner HENAN NORMAL UNIV