We studied romanechite, (2 × 3) tunnel type manganese dioxide, as a positive electrode material for rechargeable lithium batteries. We synthesized the sample by soft chemical techniques, and its chemical composition was Ba 0.18 MnO 2.10 ·0.42H 2 O. We obtained a first discharge capacity of 120 mAh g -1 (energy density 264 mWh g -1 ). The capacity decreased with cycling. We examined the thermal behavior of this material, revealing its high thermal stability. © 2001 Elsevier Science B.V. All rights reserved.
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