Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Mitsugu Okahisa

Kaoru Murakami

Toshihiko Ikehata

Tomohiko Arita

Fumio Daio

Hiroshi Kumano

Susumu Yamanaka

Tetsuya Takeuchi

Seiichi Mizutani

Masaaki Kaneda

Daisuke Sumimoto

Takao Uyama

Masahiko Yoshida

Kumano, Hiroshi

Seiichi Mizuani

A lithium primary battery including: a positive electrode containing a mixed crystalline manganese oxide; a negative electrode containing at least one selected from the group consisting of lithium and a lithium alloy; and a lithium-ion conductive non-aqueous electrolyte. The mixed crystalline manganese oxide contains at least &#x3bb;-type manganese oxide and &#x3b2;-type manganese oxide, and the &#x3b2;-type manganese oxide has a crystallinity of 300 to 500. The mixed crystalline manganese oxide preferably has a specific surface area of 0.5 to 4 m/g. The lithium alloy preferably contains at least aluminum in an amount of 0.2 wt % to 15 wt %.

Lithium primary battery

The instant specification discloses a flat battery constituted by sealing a power generation element with: a case that works as one electrode terminal; a sealing plate that works as the other electrode terminal and has a flat central section projected outward and a flat peripheral section extending substantially parallel to the flat central section; and a gasket that insulates the case from the sealing plate, characterized in that the peripheral section of the sealing plate has an outer circumferential part being bent, or the case has a turned edge provided to make the peripheral section of the sealing plate fitted therein via the gasket and to partly press the gasket. The flat battery of the present invention having improvement in shape of the sealing plate and/or the case is sufficiently thin and exerts the effects of high leakage resistance and excellent mass productivity.

Flat battery

A gasket-integrated case is obtained by punching out a circular piece from a metal sheet on which a gasket resin film having a round hole is integrally laminated with an adhesive, in such a way as to have a diameter concentric with, but larger than, the round hole, and by drawing the circular piece into a bottomed cylindrical shape. Elements for electromotive force and a sealing plate are then disposed on the case, and the periphery of the sealing plate is sandwiched and sealed by the periphery of the case by crimping, with a gasket including the resin film interposed therebetween, so that a coin-shaped battery is formed. The resin film has a thickness in the range of 20 &mgr;m to 150 &mgr;m and a modulus of elasticity equal to or greater than 35 kgf/mm .

Coin-shaped battery and method for producing the same

Battery for an IC card

The disclosure relates to a silver oxide primary cell which includes a casing composed of a positive electrode container and a negative electrode container to define a sealed chamber between them, a positive electrode, an insulating layer, a negative electrode, a separator member, an electrically conductive member, and an insulating gasket housed in the sealed chamber. The electrically conductive member is pressed, at its portion protruding toward peripheral edge portion of the positive electrode, against the bottom face of the positive electrode container by the insulating gasket, and is simultaneously electrically connected to the bottom face or side wall of the positive electrode container.

Silver oxide primary cell

The present invention relates to a divalent silver oxide for use in primary cells which is stable in an alkaline solution, slow in the speed of oxygen gas generation with favorable reproducibility and has X-ray diffraction peak values different from that of conventional divalent silver oxide and the method of manufacturing the divalent silver oxide of the above described type. By the employment of the divalent silver oxide according to the present invention, it is possible to produce, at low cost, batteries having high energy density per unit weight and volume, with small amount of gas generation to prevent swelling or expansion of the cells.

Divalent silver oxide for use in primary cell and manufacturing method

Growing community of inventors

Ibaraki, Japan

Mitsugu Okahisa