Making method of nickel hydroxide with coated gamma hydroxy cobalt oxide

A technology of nickel hydroxide and γ-hydroxyl coating, which is applied in the direction of nickel oxide/nickel hydroxide, cobalt carbonyl, alkaline battery electrodes, etc., and can solve the problems that the preparation method has not seen.

Active Publication Date: 2008-01-16
JINCHI ENERGY MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] At present, there are no relevant reports on the research on the im

Method used

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  • Making method of nickel hydroxide with coated gamma hydroxy cobalt oxide

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Embodiment 1

[0029] Main raw material: spherical nickel hydroxide substrate is commercially available (produced by Jintian Energy Materials Co., Ltd.).

[0030] ① Solution preparation: 1M cobalt sulfate solution, 20% sodium hydroxide solution, 20% ammonia solution.

[0031] ② Coated cobalt hydroxide:

[0032]Put the main raw materials into the reactor, add pure water, sodium hydroxide solution and ammonia solution to form a reaction with a nickel hydroxide solid concentration of 200 g / L, an ammonia concentration of 5 g / L, a pH of 9.5, and a temperature of 60 °C. solution; then the prepared 1M cobalt sulfate solution, 20% sodium hydroxide solution, and 20% ammonia solution were simultaneously and continuously added to the reactor, and the temperature of the reaction system was kept at 60°C under the stirring condition of 200 rpm. The pH is 9.5, the ammonia concentration in the system is 5 g / L, and the reaction time lasts for 3 hours. The amount of cobalt solution added in the reaction is ...

Embodiment 2

[0036] The nickel hydroxide active material A with the surface coating gamma cobalt oxyhydroxide obtained in Example 1 is subjected to doping modification treatment, the method is:

[0037] The nickel hydroxide active material A of the surface coating gamma cobalt oxyhydroxide is added in the lithium hydroxide solution of 10 grams / liter, makes the solid concentration of nickel hydroxide active material A in the solution be 200 grams / liter, under stirring condition Maintain the temperature of the reaction system at 60°C, and the reaction time is 30min; then filter the treated material, wash it with pure water until the pH is 8.0, and then dry it at 110°C to obtain the surface-coated γ cobalt oxyhydroxide hydroxide Nickel active material B.

[0038] The powder impedance of the nickel hydroxide active material B obtained in Example 2 is 1 Ω cm, and the average valence state of cobalt coated with cobalt on the surface is 3.16 as measured by iodometric method; the M content in the ...

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Abstract

The invention relates to a preparation method for nickel hydroxide, which is used as a Ni-H storage battery positive material, coated with gamma hydroxy cobalt oxide. The preparation includes that the sphere surface of nickel hydroxide is coated with a layer of cobalt hydroxide firstly; then, under the conditions of high-density sodium hydroxide and oxygen, the cobalt hydroxide layer coated on the surface is oxidized the gamma hydroxy cobalt oxide, or the treatment of embedding doped metals is exerted on the gamma hydroxy cobalt oxide layer. By controlling the coating layer to be the cobalt hydroxide presenting a shape of flake, the method makes the resulted conducting network coated with the coating layer of gamma hydroxy cobalt oxide more uniform, more integrated and better conductive, and thus attributes the nickel hydroxide positive active material coated with gamma hydroxy cobalt oxide with some characteristics of high recovering rate of over-discharging capacity, good performance of big current discharging, low self-discharging, long lifetime of cycling use and so on.

Description

Technical field: [0001] The invention relates to a method for preparing positive electrode active materials used in nickel-hydrogen storage batteries. Background technique: [0002] As an excellent green secondary battery, Ni-MH batteries have been widely used in communication, information and many other fields. As the positive electrode active material used therein, the product performance of nickel hydroxide directly affects the performance of the nickel-metal hydride secondary battery. With the development of modern electrical components, and the field of electric vehicles researched and developed by the constraints of the world's petroleum resources and the influence of environmental pollution factors, higher performance requirements are put forward for nickel-metal hydride secondary batteries. In the nickel-hydrogen battery market, there is an increasing demand for high-quality nickel hydroxide cathode materials with high conductivity, high specific capacity, good high...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/26B22F1/02C01G53/04C01G51/02
CPCY02E60/124Y02E60/10
Inventor 周勤俭覃事彪张海艳胡泽星袁庆文
Owner JINCHI ENERGY MATERIALS CO LTD
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