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Surface cladding cobaltous hydroxide for anode active material of alkaline cell and preparation method thereof

A positive electrode active material, cobalt hydroxide technology, applied in the direction of alkaline battery electrodes, etc., can solve the problems of only loose point contact and electrochemical inactivity, so as to reduce the internal resistance of the battery, increase the battery capacity, and improve the cycle life. Effect

Active Publication Date: 2005-07-06
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has also been proposed to generate an electrochemically inactive cobalt oxyhydroxide layer with conductivity. The method is to deposit a layer of cobalt hydroxide on the surface of nickel hydroxide, and then oxidize it into cobalt oxyhydroxide under alkaline conditions. However, its disadvantages is the fact that the surface of nickel hydroxide has a good conductive layer, but only loose point contacts can be formed between the particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put 50 kg of spherical nickel hydroxide into a 500-liter reactor filled with deionized water, stir, and add the pre-prepared 1.0mol / l cobalt sulfate solution and 2.0mol / l sodium hydroxide solution into the reactor in parallel Coating in the middle, control temperature 45±0.5℃, pH value 9.5±0.1. After the amount of coated cobalt reaches the requirement, stop adding the cobalt sulfate solution until the pH value is 11.9-12.0. After half an hour, filter and wash, put the washed solid material into an ethanol reaction cover with the same weight as the solid material, carry out dehydration treatment, then filter and wash with ethanol, sieve through a 8-10 mesh screen, and dry to obtain sample 1 .

Embodiment 2

[0022] Put 50 kg of spherical nickel hydroxide into a 500-liter reactor filled with deionized water, stir, and add the pre-prepared 1.0mol / l cobalt sulfate solution and 2.0mol / l sodium hydroxide solution into the reactor in parallel Coating in the middle, control temperature 45±0.5℃, pH value 9.5±0.1. After the amount of coated cobalt reaches the requirement, stop adding the cobalt sulfate solution until the pH value is 11.9-12.0. After half an hour, filter and wash, and the washed solid material is put into a reaction kettle containing 0.5% antioxidant solution of the solid material weight, and the volume of the antioxidant solution is 100 liters, and antioxidation treatment is carried out, then filtered, and after dehydration, Sieve through a sieve on the 8th to 10th, and dry to obtain sample 2.

Embodiment 3

[0024] Put 50 kg of spherical nickel hydroxide into a 500-liter reaction kettle filled with ionized water, stir, and add the pre-prepared 1.0mol / l cobalt sulfate solution and 2.0mol / l sodium hydroxide solution into the reaction kettle in parallel For coating, the temperature is controlled at 45±0.5°C and the pH value is 9.5±0.1. After the amount of coated cobalt reaches the requirement, stop adding the cobalt sulfate solution until the pH value is about 11.9-12.0. Filter and wash after half an hour, put the washed solid material into a reaction kettle containing 100 liters of 1.0mol / l sodium carbonate solution, carry out anti-oxidation treatment, then filter and wash with water for 40 minutes, after dehydration, 8-10 mesh screen Sieve and dry to obtain sample 3.

[0025] sample name

[0026] The standard sample is a battery made of conventional spherical nickel hydroxide doped with a conductive agent. The above data are average values.

[0027] sample na...

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PUM

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Abstract

This invention refers to cobalt hydroxide and preparation thereof, which is used to be coated on the surface of spherical nickel hydroxide of alkaline cell, wherein the cobalt is 1.0-10 % of total weight, the spherical nickel hydroxide contains 0-10 % of co-sinks of Co, Zn or hydroxide of Co and Zd. The preparation contains surface covering, filtering, washing, dewatering and drying. The spherical nickel hydroxide is oxidized to cobalt hydroxide with high conductivity in charge process, which effectively improves the conductivity of active substance, raises the availability of active substance, increases cell capacity, discharge capacity, reduces cell internal resistance, increases cycle service life and greatly raises the quality of cell positive active substance.

Description

technical field [0001] The invention relates to the field of cathode materials for secondary alkaline batteries, in particular to the surface coating of cathode active materials in batteries such as Cd-Ni, MH-Ni, and Zn-Ni. Belongs to the field of material science and chemical industry. Background technique [0002] In recent years, with the further expansion of battery application fields, the demand for high energy density and high performance batteries has also increased, so the performance of positive electrode active materials is also required to be improved. At present, most manufacturers of secondary alkaline batteries use nickel hydroxide as the positive electrode active material. Since nickel hydroxide is a P-type semiconductor with poor conductivity, its reversibility is poor, and the utilization rate of active materials is not high. In order to further improve the utilization rate of active materials, increase the reversibility of redox, increase the depth of dis...

Claims

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Application Information

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IPC IPC(8): H01M4/24
CPCY02E60/10
Inventor 周汉章刘明军徐庆
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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