Composite metal oxide, process for producing the composite metal oxide, positive active material for sodium secondary battery, positive electrode for sodium secondary battery, and sodium secondary battery
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United States of America Patent
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Dec 1, 2015
Grant Date -
Jan 16, 2014
app pub date -
Oct 28, 2011
filing date -
Nov 5, 2010
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Provided are: a composite metal oxide with which it is possible to improve the performance of a sodium secondary battery; a process for producing the composite metal oxide; a positive active material which comprises the composite metal oxide; a positive electrode produced using the positive active material; and a sodium secondary battery including the positive electrode. The composite metal oxide is represented by the following formula: NaxFeyMn1-yO2. The composite metal oxide is constituted of an oxide having a P2 structure and a lamellar oxide, with some extent of stacking faults, having an octahedral structure and/or a triangular-prism structure. The lamellar oxide preferably is an oxide having an O3 structure.
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