過マンガン酸塩と硫酸マンガンからのリチウム一次電池用二酸化マンガンの合成

抄録

Manganese dioxides were prepared from the solutions of permanganate. salts and manganese sulfate at 80℃ for 1 h. The formation of γ-MnO₂ phase was confirmed by X-ray diffraction. The particle size and specific surface area of the product were 0.3-0.4μm and 218-226 m² g^－1, respectively. After heating at 375℃ for 5h in air, the formation of β-MnO₂ phase was observed. When the product was used as the cathode material of lithium/manganese oxide cell, the discharge capacity at 0.88 mA cm^－2 was 239-256 mAh g^－1, which were higher than that of the cell using electrolytic manganese dioxide (188 mAh g^－1). It was found that the manganese dioxide prepared using this process is hopeful as a cathode material for lithium/manganese dioxide battery.