Method for preparing alkaline secondary cell anode active matter

Abstract

The invention relates to a method for fabricating an active substance of alkaline secondary battery positive pole, wherein, the invention comprises the steps that a bivalent cobalt salts solution is used to moisten a nickel hydroxide which is dried to get the nickel hydroxide containing the bivalent cobalt salts, the nickel hydroxide containing bivalent cobalt salts is contacted with an alkaline solution, the nickel hydroxide deposited with Co(OH)2 to be made under an oxidizing condition is contacted with an oxidizer, so the nickel hydroxide containing the cobalt oxy-hydroxide is made out, the weight ratio between the bivalent cobalt salts solution and the nickel hydroxide is 0.05-0.25:1; the cobalt oxy-hydroxide layer of the nickel hydroxide made by the invention is uniform, the granule shape of the nickel hydroxide is regular, which are all separately independent individual, the agglomeration problem can not occur, therefore, after the nickel hydroxide granule containing the cobalt oxy-hydroxide is fabricated into a battery, the performance of the batter is favorable; furthermore, the equipment used for the invention is simple, the reaction process does not have the conditions which need to be strictly controlled, the operation is easy and feasible.

Description

technical field [0001] The invention relates to a method for preparing positive electrode active materials of alkaline secondary batteries. Background technique [0002] Alkaline secondary batteries include nickel-cadmium secondary batteries, nickel-zinc secondary batteries and nickel-hydrogen secondary batteries, etc., and their positive electrode active material is spherical nickel hydroxide. The performance of alkaline secondary batteries is greatly affected by the positive active material, so the improvement of the performance of spherical nickel hydroxide has always been a main direction of people's research. [0003] Nickel hydroxide is an electronic insulator, also known as a low-conductivity P-type semiconductor. Therefore, there is a large contact resistance between nickel hydroxide particles and between nickel hydroxide and the current collector, which makes it unable to fully react during charge and discharge. , affects the utilization rate of the positive active...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is on the one hand in order to overcome the harsh reaction conditions, many reaction equipments, complex operation and long reaction time defects of the existing method for preparing the positive electrode active material of alkaline secondary batteries; The trivalent cobalt oxide is completely deposited on the positive electrode active material, and the particle shape of the obtained positive electrode active material is irregular, and the defects of the trivalent cobalt oxide layer are not uniform, and a simple and easy method is provided to oxidize the trivalent cobalt The preparation method of the positive electrode active material of the alkaline secondary battery that the substance is completely deposited on the positive electrode active material, and the particle shape of the obtained positive electrode active material is regular, and the trivalent cobalt oxide layer is uniform

Images