HEAVY METAL-FREE RECHARGEABLE ZINC NEGATIVE ELECTRODE FOR AN ALKALINE STORAGE CELL

摘要

A heavy metal-free rechargeable zinc electrode (12) for use in storage cells (10) having alkaline electrolyte (24) has been developed. The electrode includes a current collector (20) and an active mass (22) based on metallic zinc and zinc oxide powders, calcium hydroxide, indium hydroxide, indium sulfate, bismuth-oxide and a binder. The electrodes have been successfully used in Ni-Zn and Ag-Zn cells. The electrodes lead to environmentally benign alkaline cells. The electrodes have additional advantages over the prior art electrodes in terms of initial capacity and cyclability.