Preparation method of cobalt oxide coated nickel hydroxide composite material for alkaline rechargeable battery

A secondary battery, nickel hydroxide technology, applied in the direction of alkaline batteries, battery electrodes, nickel batteries, etc., to achieve the effects of long service life, improved conductivity and cycle stability, and high specific capacity

Inactive Publication Date: 2018-05-29
宁波高新区锦众信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But in general, the nickel hydroxide material coated with γ-cobalt oxyhydroxide on the surface has improved in terms of electrical performance indi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1 Preparation of Cobalt Oxide Coated Nickel Hydroxide Composite Material for Alkaline Secondary Battery

[0026] (1) Preparation of spherical nickel hydroxide precursor doped with yttrium

[0027] Mix nickel chloride, cobalt sulfate and yttrium sulfate in the molar ratio of nickel, cobalt, and yttrium: 90% nickel, 7% cobalt, and 3% yttrium to prepare a 1 mol / L nickel, cobalt and yttrium salt solution with a concentration of 3 -5 mol / L potassium hydroxide solution, preparing a complexing agent of ammonia water with an ammonia concentration of 15%, and simultaneously injecting it into a reaction kettle with stirring and dispersing function for chemical precipitation, wherein the flow rate of the salt solution is 3ml / min The flow rate of potassium hydroxide is 6ml / min, the flow rate of ammonia solution is 3ml / min, and the conditions for controlling the chemical reaction are pH in the range of 11-13 and temperature at 60℃. The precipitate obtained is suction filtered and...

Example Embodiment

[0032] Example 2 Preparation of Cobalt Oxide Coated Nickel Hydroxide Composite Material for Alkaline Secondary Battery

[0033] (1) Preparation of spherical nickel hydroxide precursor doped with yttrium

[0034] Mix nickel chloride, cobalt sulfate and yttrium sulfate in the molar ratio of nickel, cobalt, and yttrium: 95% nickel, 3% cobalt, and 2% yttrium to prepare a 2 mol / L nickel, cobalt and yttrium salt solution, with a concentration of 3 -5 mol / L potassium hydroxide solution, a complexing agent for preparing ammonia water with an ammonia concentration of 25%, and at the same time injected into a reactor with stirring and dispersing function for chemical precipitation, wherein the flow rate of the salt solution is 5ml / min , The flow rate of potassium hydroxide is 8ml / min, the flow rate of ammonia solution is 5ml / min, the conditions for controlling the chemical reaction are pH in the range of 11-13, temperature at 70℃, suction filtration of the obtained precipitate, and deionized...

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Abstract

The invention discloses a preparation method of a cobalt oxide coated nickel hydroxide composite material for an alkaline rechargeable battery. The preparation method comprises the following steps: (1) preparing nickel chloride, cobalt sulfate and yttrium sulfate into nickel cobalt yttrium saline solution and injecting a potassium hydroxide solution and an ammonium hydroxide complexing agent intoa reaction kettle to perform chemical precipitation to obtain a yttrium doped spherical nickel hydroxide precursor; (2) weighing the defined amount of yttrium doped spherical nickel hydroxide precursor, putting into a sealed oxidizing reactor and inflating O2 to perform oxidization; (3) adding a Mg(OH)2 alkaline water solution into the oxidizing reactor after reaction finishes to perform thermal-insulation treatment. According to the alkaline rechargeable battery spherical nickel hydroxide material prepared by the preparation method disclosed by the invention, electrical conductivity and cycling stability of spherical nickel hydroxide are greatly improved; when the spherical nickel hydroxide material is applied to the alkaline rechargeable battery, the battery has the advantages of high specific capacity and longer service life.

Description

technical field [0001] The invention relates to the field of alkaline secondary battery manufacturing, in particular to a preparation method of a cobalt oxide-coated nickel hydroxide composite material for alkaline secondary batteries. Background technique [0002] With the aggravation of energy crisis and environmental pollution, the development of electric vehicles has attracted more and more attention. Metal hydride nickel-metal hydride secondary battery (Ni / MH) has become a popular choice for electric vehicles (EV) and hybrid vehicles ( The best power source for HEV). In a nickel-hydrogen battery, the performance of the positive active material is the key to improving the overall performance of the battery. Especially as a power battery for electric vehicles, the high-current charge-discharge performance of the nickel electrode needs to be further improved. [0003] Nickel hydroxide is a material with semiconducting properties, and its internal and inter-particle resis...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M10/30
CPCH01M4/366H01M4/525H01M4/5815H01M10/30Y02E60/10
Inventor 蒋玛丽
Owner 宁波高新区锦众信息科技有限公司
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