Preparation method of nanocluster divalent silver oxide positive electrode material

Abstract

The invention relates to a preparation method of a nanocluster divalent silver oxide positive electrode material. The method comprises the following steps: pressing silver powder into silver plates; carrying out electrochemical pulse oxidation on the silver plates in an alkaline solution; and then washing and drying the silver plates, thereby finishing the preparation process of the nanocluster divalent silver oxide positive electrode material. By an electrochemical pulse oxidation method, the divalent silver oxide positive electrode material formed by clusters comprising silver oxide nanoparticles is prepared by adjusting the pulse frequency and controlling the growth morphology of the divalent silver oxide positive electrode material; the sizes of the nanoparticles are about 500nm; the sizes of the clusters are about 5 microns; and relatively large pores are formed between the clusters, so that ionic migration is facilitated; the size distribution is uniform; the product purity is high; the nanoclusters have multiple electrochemical active sites; the electrochemical activity is high; and the nanocluster divalent silver oxide positive electrode material has excellent discharge rate, very low electrode polarization and especially high electrochemical utilization rate, has excellent electrical properties, is simple in preparation process and does not contain other substance residues.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for power batteries, and in particular relates to a preparation method of a nano-cluster divalent silver oxide positive electrode material. Background technique [0002] Divalent silver oxide (AgO) cathode material has excellent rate performance, high specific capacity and excellent stability. It is an ideal cathode material for propulsion power batteries and is widely used in aluminum-silver batteries, zinc-silver batteries and lithium-silver batteries, etc. In military propulsion power batteries. The morphology and purity of the divalent silver oxide cathode material directly affect its electrochemical performance, and the electrochemical performance of the divalent silver oxide cathode material is the decisive factor for the performance of the above-mentioned power battery. [0003] The preparation of currently known divalent silver oxide cathode materials is mainly biased...

AI Technical Summary

Problems solved by technology

Among them, the porous divalent silver oxide cathode material is usually oxidized into monovalent silver oxide or divalent silver oxide cathode material first, and then the macroporous silver powder is prepared by electrochemical reduction, and the washed and dried macroporous silver powder is pressed into tablets. And form an electrolytic cell with a nickel sheet, perform electrochemical oxidation in an alkaline solution, and obtain a porous divalent silver oxide positive electrode material after washing and drying. The reaction is not helpful, and it is difficult to improve the electrochemical characteristics; the spike-shaped divalent silver oxide cathode material usually adopts a two-step method, first attaching the silver powder to the inducer, and then pressing the attached silver powder into a sheet, Electrochemical oxidation is carried out in an alkaline solution, and the spike-shaped divalent silver oxide cathode material is obtained after washing and drying. The electrochemical performance of the material prepared by this method is relatively excellent, but the preparation process is relatively complicated, and there will be residues of inducers

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