Matsushita Electric Industrial Co., Ltd.

Matsushita Electrical Industrial Co., Ltd.

Akira Ohta

Shigeo Kobayashi

Jun Watanabe

Yoshiaki Nitta

Kazuhiro Okamura

Nobuharu Koshiba

Kazunori Haraguchi

Akira Miura

Hayashi Hayakawa

Sachiko Sugihara

Keigo Momose

A nonaqueous secondary cell is provided, which includes a positive electrode including an active material having the formula: Li.sub.y Ni.sub.1-x Me.sub.x O.sub.2 where Me is one of Ti, V, Mn and Fe; the number of moles of x and y: 0.2&lt;y.ltoreq.1.3; when Me is Ti, V or Fe, 0&lt;x&lt;0.5; and when Me is Mn, 0.ltoreq.x&lt;0.6; having a hexagonal crystal structure and lattice constants a.sub.0 and c.sub.0 in the ranges of 2.83 to 2.89 .ANG. and 14.15 to 14.31 .ANG., respectively, as identified by X-ray diffraction pattern; a negative electrode of Li, an alloy of li or a carbon material intercalated with Li; and a nonaqueous electrolyte. The active material having the formula: Li.sub.y Ni.sub.1-x Mn.sub.x O.sub.2 where the number of moles of x and y are 0.ltoreq.x.ltoreq.0.3 and 1.0.ltoreq.y.ltoreq.1.3 is produced by employing as starting materials an amount of a compound of divalent Mn corresponding to the number of atomic moles of Mn indicated by x, an amount of a nickel compound corresponding to the number of atomic moles of Ni indicated by 1-x, and an amount of a lithium compound corresponding to the number of atomic moles of Li indicated by y; predrying the starting materials, subjecting to a first heat treatment in an oxidizing atmosphere and passing through a cooling stage to produce an intermediate; and subjecting the intermediate to a second heat treatment at a different temperature from that in the first treatment in an oxidizing atmosphere.

Process for production of positive electrode active material

A non-pollution zinc-alkaline battery excellent in storage stability can be obtained by using, in formulation for negative electrode, a zinc alloy which contains at least one element selected from the group consisting of bismuth, lithium, calcium and aluminum which is free from mercury, lead, cadmium, indium and thallium is used as an active material and yttrium hydroxide or yttrium oxide optimized in a starting material therefor, particle size and weight loss on heat decomposition as an inorganic inhibitor. The storage stability of the battery can be further improved by adding to the above formulation for a negative electrode a proper amount of a surfactant having a polyethylene oxide group in hydrophilic group and a perfluoroalkyl group in oleophilic group as an organic inhibitor.

Manufacturing of zinc-alkaline batteries

Air cell electrode and process for preparing its catalyst

Disclosed is a dry cell comprising a depolarizing mix consisting of manganese dioxide, carbon black and an electrolytic solution containing, as a major electrolyte, a neutral salt, a zinc anode and a cathode collector made of an alloy containing iron as a major component and more than 10% by weight of chromium.

Dry cells with stainless steel current collector

Growing community of inventors

Osaka, Japan

Akira Ohta