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Preparation method of cobalt coated alpha-nickel hydroxide composite material for alkaline secondary battery

A nickel hydroxide, secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem that the electrochemical active morphology and structure are difficult to meet the requirements of alkaline batteries, and achieve improved conductivity and cycle stability. The effect of long service life and high specific capacity

Inactive Publication Date: 2018-05-25
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

However, the nickel hydroxide produced in this way is difficult to meet the requirements of alkaline storage batteries for positive electrode materials in terms of electrochemical activity and morphology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Preparation of cobalt-coated α-nickel hydroxide composite material for alkaline secondary battery

[0021] (1) Preparation of iron and yttrium doped α-nickel hydroxide precursor

[0022] Dissolve nickel chloride, ferrous nitrate and yttrium nitrate in ethylene glycol in a reactor with a stirring device, stir at room temperature for 30 minutes, and then add according to the volume ratio of deionized water and ethylene glycol as 1:1 Deionized water, continue to stir for 20 minutes to form a mixed solution, wherein the molar concentration of nickel ions is 1mol / L, the molar concentration of ferrous ions is 0.1mol / L, and the molar concentration of yttrium ions is 0.03mol / L; Add to the above mixed solution at a dropping rate of 20mL / min until the pH of the solution is 8; keep it at 40°C for 3 hours; cool to room temperature after the reaction is completed, and wash the obtained precipitate with deionized water to pH = 7-8, dry at 90°C for 10 hours to obtain iron a...

Embodiment 2

[0025] Example 2 Preparation of cobalt-coated α-nickel hydroxide composite material for alkaline secondary battery

[0026] (1) Preparation of iron and yttrium doped α-nickel hydroxide precursor

[0027] Dissolve nickel chloride, ferrous nitrate and yttrium nitrate in ethylene glycol in a reactor with a stirring device, stir at room temperature for 40 minutes, and then add in a volume ratio of deionized water to ethylene glycol of 2:1 Deionized water, continue to stir for 30 minutes to form a mixed solution, wherein the molar concentration of nickel ions is 2mol / L, the molar concentration of ferrous ions is 0.3mol / L, and the molar concentration of yttrium ions is 0.05mol / L; Add it to the above mixed solution at a dropping rate of 40mL / min until the solution pH=8-10; keep it at 50°C for 3 hours; Wash with water to pH=7-8, and dry at 100°C for 8 hours to obtain the precursor of iron and yttrium doped α-nickel hydroxide.

[0028] (2) Cobalt coating

[0029] Mix the above-menti...

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PUM

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Abstract

The invention discloses a preparation method of a cobalt coated alpha-nickel hydroxide composite material for an alkaline secondary battery. The preparation method comprises the following steps: (1) dissolving nickel chloride, ferrous nitrate and yttrium nitrate into glycol, adding deionized water, adding dilute ammonia water into the mixed solution to perform reaction, washing and drying to obtain an iron-yttrium doped alpha-nickel hydroxide precursor; and (2) mixing the iron-yttrium doped alpha-nickel hydroxide precursor and a cobalt sulfate solution, dispersing uniformly, adding a potassiumhydroxide solution dropwise, washing, filtering and drying to obtain the iron and yttrium doped cobalt coated alpha-nickel hydroxide composite material. The alpha-nickel hydroxide composite materialfor the alkaline secondary battery prepared by the method the electrical conductivity and the cycling stability of spherical nickel hydroxide are improved while the energy density of the material is increased; and when the alpha-nickel hydroxide composite material is applied to the alkaline secondary battery, the battery has high specific capacity and long service life.

Description

technical field [0001] The invention relates to the technical field of alkaline secondary battery manufacturing, in particular to a preparation method of a cobalt-coated α-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] Ni(OH) 2 As a positive electrode active material, it is widely used in Ni / Cd, Ni / Zn, Ni / Fe, Ni / MH...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62
CPCH01M4/364H01M4/52H01M4/626Y02E60/10
Inventor 蒋玛丽
Owner 宁波高新区锦众信息科技有限公司
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