Japan Vilene Company, Ltd.

Other

Sanoh Industrial Co., Ltd.

Jemco Inc.

Ube Exsymo Co., Ltd.

Toshiaki Takase

Masanao Tanaka

Hiroyuki Imai

Yoshihiko Kondo

Masaki Hirooka

Kaori Yoshida

Kazuya Satou

Yasuhiro Ito

Hiroaki Yamazaki

Kazuya Sato

Noriko Miyaguchi

Kunikazu Nagai

Shinji Oota

Yoshitaka Mayuzumi

Keisuke Takahashi

Kazuya Tsuda

A battery separator comprising a nonwoven fabric, wherein the nonwoven fabric contains (1) superfine fibers having a fiber diameter of 3 &#x3bc;m or less, (2) noncircular fine fibers having a noncircular cross-sectional shape and having a fiber diameter of 3 to 5 &#x3bc;m (excluding 3 &#x3bc;m), the fiber diameter meaning a diameter of a circle having an area the same as that of the noncircular cross-sectional shape, and (3) polypropylene based high-strength composite fibers containing a fusible component on the surface thereof and having a tensile strength of 4.5 cN/dtex or more, and the fusible component contained in the polypropylene based high-strength composite fibers is fused, and a battery comprising the battery separator are disclosed. A battery separator of the present invention has a high electrolyte-holding capacity and is capable of effectively preventing a short circuit, even if the separator is designed to be thinner to enhance the capacity of a battery.

Battery separator and battery comprising same

An alkaline battery separator which enables the preparation of a battery with a good yield and workability is provided. The alkaline battery separator of the present invention comprises a fiber sheet mainly comprising hydrophilicity-imparted polyolefin fibers having a fiber diameter of 8 &#x3bc;m or more, and a part of the hydrophilicity-imparted polyolefin fibers is composed of high-strength fibers having a tensile strength of 5 g/d or more.

Alkaline battery separator and process for producing the same

An alkaline battery comprises an electrode. The electrode has a current collector and an active substance filled in the current collector. The current collector includes a nonwoven fabric fabricated from a plurality of fibers and a nickel-plating film formed on the plurality of fibers. A specific surface area per unit volume of the current collector is 0.13 m/cm-0.35 m/cm.

Alkaline battery, current collector, electrode, and method of manufacturing electrode

Disclosed is a battery separator consisting essentially of a nonwoven fabric having a substantially unilayered structure, wherein an apparent total surface area of fibers per a surface density of the nonwoven fabric is 20 mor more, a thickness of the nonwoven fabric is 0.1 mm or less, a uniformity index of the nonwoven fabric is 0.15 or less, and the nonwoven fabric contains fine fibers having a fiber diameter of 4 &#x3bc;m or less.

Battery separator

A hydrophilic collector for alkaline secondary batteries is formed of a nonwoven fabric plated with nickel in which the nonwoven fabric is hydrophilized by sulfonation, a gaseous fluorine treatment, or vinyl monomer grafting. A method for making the collector includes a hydrophilizing step of a nonwoven fabric comprising at least one of a polyolefin fiber and a polyamide fiber, and a plating step of applying nickel plating to the hydrophilic nonwoven fabric. Preferably, the nickel plating is electroless plating, and the nonwoven fabric has a plurality of micropores extending from one surface to the other surface thereof. An electroplating film may be deposited on the electroless plated film, if necessary. This collector facilitates assembling a battery which exhibits improved high-rate discharge characteristics due to improved adhesiveness of the plated nickel film to the nonwoven fabric.

Collector for alkaline secondary battery, method for making the same, and alkaline secondary battery using the same

An alkaline battery separator which enables the preparation of a battery with a good yield and workability is provided. The alkaline battery separator of the present invention comprises a fiber sheet mainly comprising hydrophilicity-imparted polyolefin fibers having a fiber diameter of 8 &mgr;m or more, and a part of the hydrophilicity-imparted polyolefin fibers is composed of high-strength fibers having a tensile strength of 5 g/d or more.

A battery separator is provided which is hardly broken by tension during the manufacture of batteries, is hardly punctured with a plate flash, and is hardly torn off with a plate edge, thereby hardly causing a short circuit. Accordingly, the separator can facilitate the stable manufacture of the batteries. The battery separator is equipped with a fiber sheet containing a polypropylene fiber having a tensile strength of not less than 10 g/d (denier) and a Young's modulus of not less than 800 kg/mm , said separator having a resistance of not less than 585 gf to puncture by edge, or is equipped with a fiber sheet containing not less than 10 mass % of a polypropylene fiber having a tensile strength of not less than 10 g/d (denier) and a Young's modulus of not less than 800 kg/mm .

Growing community of inventors

Ibaraki, Japan

Toshiaki Takase