Nippon Telegraph and Telephone Corporation

Yoji Sakurai

Shigeto Okada

Jun-ichi Yamaki

Jun-Ichi Yamaki

Takeshi Okada

Toshiro Hirai

Hajime Arai

Hideaki Ohtsuka

Fumikatsu Yoshimura

Reiichi Chiba

A solid oxide fuel cell, which converts a chemical reaction between a fuel and air or oxygen into electric energy, and which is constructed by a solid electrolyte, an air electrode mounted adjacent to the solid electrolyte, a fuel electrode, and an inter-connector for connecting with other cell units is provided. The air electrode of the above fuel cell is made of a perovskite-type oxide material with a composition expressed by LnNi.sub.1-x Fe.sub.x O.sub.3 and YNi.sub.1-x Fe.sub.x O.sub.3 and wherein Ln represents lanthanide elements and x is in a range of 0.30 to 0.60. The perovskite-type oxide materials containing nickel and iron satisfy requirements to provide higher electronic conductivity than the conventional material and closer thermal expansion coefficient to that of the solid electrolyte than that of the conventional air electrode material.

Perovskite-type oxide materials containing nickel and iron for air

A positive electrode material for use in lithium batteries contains a compound represented by the chemical formula Li.sub.x Fe.sub.2 (SO.sub.4).sub.3 (0&lt;x.ltoreq.2). This positive electrode material is made from low cost material which is available in abundant quantities. Moreover a lithium battery using this material has a large discharge energy and long cycle life.

Material for use in the positive electrodes of lithium batteries, its

A lithium battery essentially consisting of an amorphous cathode active material mainly composed of V.sub.2 O.sub.5 and prepared by adding with at least one first additive selected from the group consisting of P.sub.2 O.sub.5, TeO.sub.2, GeO.sub.2, Sb.sub.2 O.sub.3, Bi.sub.2 O.sub.3 and B.sub.2 O.sub.3 and/or at least one second additive selected from the group consisting of MoO.sub.3 and WO.sub.3, heating to melt the admixture and then quenching the molten admixture; an anode active material made of metallic lithium or a lithium alloy; and an electrolyte made of a mixture of a aprotic solvent and a lithium salt. The battery is a small-sized and light-weight secondary battery having a high energy density and being improved in charge-discharge cycle lifetime.

Lithium battery including vanadium pentoxide base amorphous cathode

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Yoji Sakurai