Kabushiki Kaisha Toyota Chuo Kenkyusho

Tatsuo Noritake

Tatsumi Hioki

Masakazu Aoki

Tsuyoshi Sasaki

Jun Sugiyama

Shin-ichi Towata

Tatsuya Hatanaka

Nobuko Oba

A hydrogen storage material is expressed by a composition formula, (CaA)(SiB), wherein 'A' is at least one member selected from the group consisting of alkali metal elements, alkaline-earth metal elements, rare-earth elements, the elements of groups 3 through 6, Ni, Au, In, Tl, Sn, Fe, Co, Cu and Ag; 'B' is at least one member selected from the group consisting of the elements of groups 7 through 17, rare-earth elements, Hf and Be; 0&#x2266;x&#x3c;1 by atomic ratio; 0&#x2266;y&#x3c;1 by atomic ratio; and 0.38&#x2266;z&#x2266;0.58 by atomic ratio. It is lightweight as well as less expensive. In principle, neither high-temperature nor high-pressure activation is required, because it exhibits a high initial activity. The operation temperature can be lowered and the hydrogen absorption content can be enlarged by controlling the kind and substitution proportion of the substituent elements appropriately.

Hydrogen storage material

Disclosed is a positive electrode material for a secondary lithium battery excellent in high temperature cycle characteristics which is a lithium manganese oxyfluoride having a spinel structure, wherein the oxyfluoride has a composition represented by the composition formula:

Positive electrode material for secondary lithium battery

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Nagoya, Japan

Tatsuo Noritake