Manganese dioxide electrodes that have x‐ray diffraction patterns characteristic of
α‐MnO2
(hollandite‐type structure) and ramsdellite‐
MnO2
have been evaluated in rechargeable 3 V lithium cells. Electrochemical data indicate that these electrodes (162 mAh/g, 10th cycle) provide superior performance to both single‐phase pure
α‐MnO2
(136 mAh/g, 10th cycle) and ramsdellite‐
MnO2
electrodes (113 mAh/g, 10th cycle), and comparable performance to lithia‐stabilized
α‐MnO2 false(0.15Li2O⋅MnO2false)
electrodes (153 mAh/g, 10th cycle). Transmission electron microscopy images and convergent‐beam electron diffraction patterns show that the
MnO2
samples consist of grains of α‐
MnO2
grains of ramsdellite‐
MnO2
, and grains of “interconnected”
α‐MnO2
and ramsdellite‐
MnO2
which exhibit a mutual crystallographic orientation. A search is underway to find other interconnected
MnO2
materials with even better cycling performance.
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