Tosoh Corporation

Takashi Mouri

Kazuaki Yamamoto

Nobuhiro Ogawa

Kimitaka Kuma

Masaki Okada

Ryoji Yoshimura

Chikara Uema

A manganeses oxide is provided which is represented by the general formula A.sub.x Mn.sub.2 O.sub.4.nH.sub.2 O, where A is Zn, Mg, Ca, or Co; and if A is Zn, 0&lt;x&lt;1 and n=0; if A is Mg or Ca, 0.ltoreq.x.ltoreq.1 and 0.ltoreq.n.ltoreq.20; and if A is Co 0&lt;x.ltoreq.1 and n=0. The manganese oxide has a spinel type, a layer type, or amorphous type both crystal structures of layer type and spinel type. The manganese oxide is produced by oxidizing a mixture of a hydroxide of A (where A is Zn, Mg, Ca, or Co) and manganese hydroxide in a molar ratio 1:2 in an alkali solution, and then removing A by oxidation treatment. A lithium secondary battery is provided by use of a kind of the above manganese oxide for the positive electrode, exhibiting high output with high energy density and with satisfactory reversibility in charge-discharge cycle.

Manganese oxides production thereof, and use thereof

An ITO sintered body according to the present invention has a density thereof of between 90 and 100% and a sintering particle size of between 1 and 20 .mu.m. A proportion of (In.sub.0.6 Sn.sub.0.4).sub.2 O.sub.3 in the ITO sintered body is 10% or below. Such an ITO sintered body is manufactured by mixing an indium oxide powder, whose BET surface area is between 15 and 30 m.sup.2 /g, a BET size/a crystallite size is 2 or below, and an average primary particle size is between 0.03 and 0.1 .mu.m, with tin oxide whose BET surface area is 3 m.sup.2 /g or below, and then by sintering the mixture.

Ito sintered body and method of manufacturing the same

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Hikari, Japan

Takashi Mouri