Abstract

Since Leclanche invented the dry battery with manganese dioxide and zinc as active materials, batteries have yielded revolutionary improvement with the growth of industry. Today, the production of the chemical batteries in Japan has reached 6 billion units, corresponding to 656 billion in sale. Most recent remarkable development of electronic devices has made appliances cordless and small-sized so that high performance batteries have attracted growing interest as small size and high energy density. Nowaday, batteries have been recognized as one of three key devices in electronic industry. We, Mitsui Mining & Smelting Co., Ltd. started the commercial production of electrolytic manganese dioxide in 1949 and has produced variety of key materials for batteries, i. e., zinc alloy powders, lead alloys, cadmium oxide, lithium foils and hydrogen storage alloys. In this paper, high quality of electrolytic manganese dioxide and mercury-free zinc alloy powders will be introduced and Research Development activities for battery materials in Mitsui Mining & Smelting Co., Ltd. will be outlined as well.

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