Abstract
Todorokite type Mg x MnO 2· yH 2O which possesses 3×3 large tunnel structure was prepared through hydrothermal treatment of layer manganese dioxide, buserite, at 120–200°C. In non-aqueous Li and Mg cells, electrochemical insertion of Li + and Mg 2+ into the todorokite products occurred utilizing the preferable large tunnel for their diffusion. By heat-treatment up to 300°C, cycle performances in Li cell were improved by removing water molecules from the todorokite tunnel.
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