Japan Vilene Company, Ltd.

National Institute of Advanced Industrial Science and Technology

Tatsuo Nakamura

Masanao Tanaka

Ken Waku

Shinich Kitazawa

Takeshi Ogino

Te Hyon Cho

Yuka Kondo

Hiroshi Ohnishi

Tetsuo Sakai

Hiroaki Yamazaki

Koichi Kato

Satoshi Kumagai

Koji Kimura

Tatsunori Ito

Takahiro Yokoyama

Susumu Hasegawa

Manami Suzuki

Yoshikazu Miyata

Disclosed are a separator for lithium ion secondary batteries, having an inorganic layer formed from inorganic particles, characterized in that the inorganic particles have a particle diameter distribution in which the 50% cumulative particle diameter Dis in the range of 100 nm to 500 nm, the 10% cumulative particle diameter Dis 0.5Dor more, and the 90% cumulative particle diameter Dis 2Dor less; a method for manufacturing the separator; and a lithium ion secondary battery using the separator. When the separator is used, there can be produced a lithium ion secondary battery in which a short circuit caused by contraction or melting can be definitely prevented, as well as the current density applied to the electrodes during charging and discharging is uniform so that charging and discharging can be efficiently achieved.

Separator for lithium ion secondary battery, method for manufacture thereof, and lithium ion secondary battery

A water control sheet having superior drainage and gas diffusion properties and superior handling characteristics, and a gas diffusion sheet, a membrane-electrode assembly and a polymer electrolyte fuel cell, which utilize the water control sheet, are provided. The water control sheet is independent and located for use adjacent to a catalyst layer of a polymer electrolyte fuel cell, and is formed of a nonwoven fabric containing conductive fibers containing conductive particles at least inside a hydrophobic organic resin. The gas diffusion sheet, the membrane-electrode assembly and the polymer electrolyte fuel cell according to the present invention have the above water control sheet.

Water control sheet, gas diffusion sheet, membrane-electrode assembly and polymer electrolyte fuel cell

Disclosed is a lithium ion secondary battery, in which comprises a vinyl alcohol polymer or a derivative thereof in an amount of 0.3 mg or more per 1 mAh of battery capacity in terms of a vinyl alcohol unit moiety content. The lithium ion secondary battery can decrease the battery voltage under high-temperature conditions and cannot be recharged after being exposed to high-temperature conditions.

Lithium ion secondary battery

Disclosed is a process for manufacturing a fiber having at least a surface comprised mainly of a thermoplastic resin and carrying solid particles affixed to the surface, comprising the steps of:

Process and apparatus for manufacturing fiber and fiber sheet carrying solid particles and fiber and fiber sheet carrying solid particles

A laminated deodorant filter medium is constituted by a plurality of laminate units laminated together; each of which includes a fiber web constituted by a connecting portion and a resin-aggregating portion, both of which are made of a hotmelt resin, and a deodorant particle firmly attached to one surface of the fiber web by way of the resin-aggregating portion. Employable as the deodorant particle is at least two kinds of deodorant particles including an acidic odor deodorant particle, an alkaline odor deodorant particle, and a physically adsorbing particle. As the resin-aggregating portion is formed at a part where a hotmelt nonwoven fabric and the deodorant particle are in contact with each other, the deodorant particle can be firmly attached to the fiber web as a single layer without using a binder, whereby a deodorant filter medium having a low pressure loss and high efficiency can be obtained.

Laminated deodorant filter medium and method of making the same

A feeder 1 for supplying a fiber material, a plurality of fiber opening cylinders 2.sub.1, 2.sub.2, 2.sub.3, . . . 2n (n is a natural number) mounted adjacent to one another for transferring and opening the fiber material fed from the feeder 1 and having metallic wires 2a mounted to the surface thereof, a conveyor 7 arranged for receiving the opened fiber unloaded from the fiber opening cylinder 2n mounted at the outlet end, and a suction box 8 arranged beneath the conveyor 7 for drawing the opened fiber towards the conveyor 7 by a sucking action. The fiber opening cylinders 2.sub.1, 2.sub.2, 2.sub.3, . . . 2n being enclosed in a housing 3 which has fiber transfer openings 4 between any two adjacent fiber opening cylinders and a fiber releasing opening 5 for unloading the opened fiber from the last fiber opening cylinder 2n. At least one of the fiber opening cylinders 2.sub.1, 2.sub.2, 2.sub.3, . . . 2n is driven to produce a centrifugal acceleration of more than 3.4.times.10.sup.5 cm/sec.sup.2 for acting on the fiber material.

Method for producing a random laid fiber web

The present invention relates to an apparatus for producing a fiber web comprising a feeder 1 for supplying a fiber material, a plurality of fiber opening cylinders 2.sub.1, 2.sub.2, 2.sub.3, . . . 2n (n is a natural number) mounted adjacent to one another for transferring and opening the fiber material fed from the feeder 1 and having metallic wires 2a mounted to the surface thereof, a conveyor 7 arranged for receiving the opened fiber unloaded from the fiber opening cylinder 2n mounted at the outlet end, and a suction box 8 arranged beneath the conveyor 7 for drawing the opened fiber towards the conveyor 7 by a sucking action, said fiber opening cylinders 2.sub.1, 2.sub.2, 2.sub.3, . . . 2n being enclosed in a housing 3 which has fiber transfer openings 4 between any two adjacent fiber opening cylinders and a fiber releasing opening 5 for unloading the opened fiber from the last fiber opening cylinder 2n, and also arranged so that any two adjacent cylinders can rotate in opposite directions. The present invention also provides a method of producing a fiber web using the above apparatus, in which at least one of the fiber opening cylinders 2.sub.1, 2.sub.2, 2.sub.3, . . . 2n is driven to produce a centrifugal acceleration of more than 3.4.times.10.sup.5 cm/sec.sup.2 for acting on the fiber material. As a result, a fiber web which is non directional and uniform is produced. Also, a fiber web in which the containing ratio of each fiber material gradually increases or decreases to the direction of the thickness of the fiber web, will be produced from two or more different fiber materials which are different in the resistance to peeling on the last fiber opening cylinder 2n. With the use of the apparatus or method of the present invention, a fiber web can be produced which is applicable to unwoven fabrics, filters, battery separators, FRP substrates, adhesive tapes, etc.

Growing community of inventors

Ibaraki, Japan

Tatsuo Nakamura