Umicore

Tokyo University of Science Foundation

Umicore Korea, Ltd.

Masataka Kajiyama

Jens M Paulsen

Shinichi Komaba

Naoaki Yabuuchi

Ryo Hara

A sodium transition metal cathode material for a rechargeable sodium battery having a P2 layered bronze crystal structure, comprising at least 55 mol % manganese, wherein the manganese valence state is at least 3.75. The material undergoes a structural transformation to a secondary cathode material by extraction of sodium during the 1charge of a rechargeable sodium battery comprising the sodium cathode material. The material has either a composition NaMOwhere M=MnLiAwhere z&#x3c;0.2 and y&#x3c;0.33 and 0.66&#x3c;x&#x3c;0.95, and wherein A consists of either one of more elements of the group Ti, Fe, Ni, Mg and Co, or a composition NaxMO2 where M=LiMnMgAwhere 0&#x3c;a&#x3c;0.2, c&#x3c;0.2 and 0.2&#x3c;a+b&#x3c;0.46 and 0.66&#x3c;x&#x3c;0.95, and wherein A consists of either one of more elements of the group Ti, Fe, Ni and Co.

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Tokyo, Japan

Masataka Kajiyama