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A method for preparing spherical nickel hydroxide coated with gamma cobalt oxyhydroxide

A spherical nickel hydroxide, γ-hydroxyl-coated technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of cobalt not being fully oxidized, sieving multiple sieves, and damage to the cobalt-coated layer. The effect of material integrity and conductive network conductivity, less agglomeration, and less agglomeration

Active Publication Date: 2015-10-28
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the preparation method described in the above-mentioned patent, the direct oxidation reaction of cobalt hydroxide will vary depending on the concentration of alkaline components present in the surroundings, the microscopic moisture of the particles, the temperature of the particles themselves during processing, the surrounding humidity and the concentration of oxygen, etc. There are large changes in different conditions, and there are complex reaction trajectories, so that the cobalt in part of the cobalt-coated layer will not be fully oxidized
Especially the generated water in the reaction process will cause the oxidized cobalt-coated spherical nickel to be easy to agglomerate. In the subsequent washing process, the agglomerated cobalt-coated layer will be damaged due to adhesion, and the agglomeration will also cause sieving. more oversize

Method used

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Examples

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Effect test

Embodiment 1

[0013] A method for preparing spherical nickel hydroxide whose surface is coated with gamma cobalt oxyhydroxide, according to the following steps:

[0014] (1) Preparation of raw material solution: 1mol / L cobalt sulfate solution, sodium hydroxide solution containing ammonia, wherein the concentration of sodium hydroxide is 5.0mol / L, the concentration of ammonia is 0.5mol / L, 50% sodium hydroxide solution , 0.7mol / L sodium hypochlorite solution.

[0015] (2) Cobalt hydroxide coating:

[0016] Put the spherical nickel hydroxide matrix into the reactor, add pure water, adjust the pH value to 10.5 with ammonia-containing sodium hydroxide solution, and continuously add cobalt sulfate solution and ammonia-containing hydrogen under the stirring condition of 200 rpm Sodium oxide solution, the temperature is controlled at 60°C, and the reaction time is 4 hours. The amount of cobalt solution added in the reaction is based on the amount of coated cobalt hydroxide accounting for 5% of the...

Embodiment 2

[0026] The oxidation product obtained in embodiment 1 is further doped, and the steps are:

[0027] Add the substance obtained after the oxidation reaction to a 10g / L lithium hydroxide solution, so that the solid concentration of the nickel hydroxide active substance in the solution is 200g / L, maintain the temperature of the reaction system at 60°C under stirring conditions, and the reaction time is 30min , and then filter the treated material, wash it with pure water to neutrality, and then dry it at 110° C. to obtain nickel hydroxide doped with lithium and coated with gamma cobalt oxyhydroxide on the surface.

[0028] The product powder impedance that embodiment 2 obtains is 1.5Ω cm, and BET is 9.21m 2 / g, the average valence state of cobalt coated with cobalt on the surface is 3.46 by iodometric method; the content of Li in the nickel hydroxide active material is 0.30%.

Embodiment 3

[0030] Prepared by basically the same steps and process conditions as in Example 1, the difference is: the oxidant used in the pre-oxidation stage is 0.7mol / L potassium thiosulfate, and the addition amount is 900ml; the oxygen oxidation reaction time is 5min.

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Abstract

The invention provides a method for preparing spherical nickel hydroxide with the surface being coated with gamma CoOOH. The method comprises the steps that spherical nickel hydroxide with the surface being coated with cobaltous hydroxide is prepared; pypocholoride or thiosulfate is added to a reactor under a stirring condition for preoxidation, reacts at the room temperature for a certain time, and is washed with pure water and dried; a preoxidation product is added to the reactor; an alkali metal hydroxide solution is added; oxygen is supplied continuously under the stirring condition; after an oxidation reaction for a certain time, a product obtained by oxidization is washed with the pure water and dried; and nickel hydroxide with the surface being coated with gamma CoOOH is obtained. With the adoption of the method, cobalt dissolution reaction in an early oxidation stage can be inhibited; no large-amount water is generated in the preparation process; and oversize products are fewer when a material is sieved.

Description

technical field [0001] The invention relates to a preparation method of a nickel battery cathode material, in particular to a preparation method of spherical nickel hydroxide whose surface is coated with gamma cobalt oxyhydroxide. Background technique [0002] Spherical nickel hydroxide is currently the most commonly used positive electrode active material for nickel-based alkaline batteries. However, nickel hydroxide itself is a semiconductor, and its poor conductivity directly limits the high-current charge and discharge performance of the battery. In order to improve the conductivity of nickel hydroxide, people coated a layer of β-Co(OH) on the surface of spherical nickel hydroxide. 2 , developed a cobalt-coated nickel hydroxide positive electrode active material. This uniform coating of β-Co(OH) on the surface 2 Oxidation to generate β-CoOOH during charge and discharge can improve the uniformity of the conductive network, thereby improving the utilization of the nicke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52
CPCY02E60/10
Inventor 王一乔蒋庆来杨先锋齐士博石建珍
Owner 先进储能材料国家工程研究中心有限责任公司
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