A hollandite‐type manganese dioxide (HolMO), without foreign metal cations (K + , , Na + in the tunnel, was prepared directly by reacting with in an acidic solution. The HolMO belonged to a body‐centered tetragonal system (space group l4/m) and could be expressed by the formula . A preliminary electrochemical study suggested that the HolMO is promising as the cathode for a lithium rechargeable battery.
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Feng et al. (1994) studied this question.