Fdk Corporation

Tanaka Chemical Corporation

Yoshiro Harada

Masanori Nakanishi

Hiroto Sagisaka

Takashi Suzuki

Masahiro Tamai

Hidenori Nagura

Mitsuhiro Nakamura

Masatake Nishio

Takeshi Miyazaki

Tomoya Murata

Keiji Fukuhara

Shinichi Ueki

Takuji Ogawa

A nonaqueous electrolyte secondary battery having a positive electrode made of a carbonaceous material, an electrolyte containing a lithium salt, and a negative electrode made of metallic lithium or a material capable of occluding and releasing lithium, wherein said positive electrode is formed from a boronized graphitic material containing boron or a boron compound such that the content of boron therein is 0.05-11 wt %. A method for production of the positive electrode of the nonaqueous electrolyte secondary battery.

Nonaqueous electrolytic secondary battery and method of producing anode material thereof

An alkaline primary cell which is improved in reduction of self-discharge and cell capacity under storage at a high temperature, has a prolonged life and makes use of nickel oxyhydroxide is provided inexpensively. &#x3b2;-Form nickel oxyhydroxide is contained in a positive electrode mixture as an active material, which contains cobalt and zinc as a substitutional element for solid solution, and has a total amount X+Y of molar ratios of cobalt atom X and zinc atom Y such that 2&#x2266;X+Y&#x2266;16, with a mixing ratio satisfying the relationship of Y&#x2266;3/2&#xd7;X+1/2 and Y&#x2267;2/3&#xd7;X &#x2212;1/3, and where a diffraction peak obtained as a result of measurement of X-ray powder diffraction of nickel oxyhydroxide appears only in the vicinity of 18.5&#xb0; within a range of 2&#x3b8;=10&#xb0;-30&#xb0;.

Alkaline primary battery

An explosion-proof battery includes a cover unit fit into an open portion of a cylindrical cup-like casing. The cover unit is electrically connected to a lead tab extended from an electricity generating unit installed in the casing. The cover unit includes a metal terminal plate of relatively high rigidity, a pressure sensitive plate in the form of a metal plate having relatively high flexibility and vulnerability, a fixing plate of insulating material, an electrical conductive member including an upwardly projecting portion and a base portion, and a ring-shaped gasket of insulating material. The terminal plate and the fixing plate have respective vent holes. The electrical conductive member and the pressure sensitive plate are connected to each other at a connecting portion on the projecting portion of the conductive member by welding. A tip end portion of the lead tab is connected to the base portion of the conductive member. When the pressure sensitive plate expands outwardly due to an extreme increase of the inner pressure, the conductive member is pulled upwardly with the pressure sensitive plate in the vicinity of the connecting portion thereof and is broken to cut off the current path between the lead tab and the terminal plate.

Battery provided with explosion-proof components

Growing community of inventors

Shizuoka, Japan

Yoshiro Harada