The Furukawa Electric Co., Ltd.

Uacj Corporation

Uacj Foil Corporation

Takayori Ito

Hidekazu Hara

Takahiro Iida

Yasumasa Morishima

Osamu Kato

Yukihiro Ikura

Yukiou Honkawa

Sohei Saito

Satoshi Yamabe

Tsugio Kataoka

Makiko Nakano

Tatsuhiro Yaegashi

Motoko Yoshizaki

Mitsuya Inoue

A thermoplastic composite material comprising, a fiber bundle having a polypropylene emulsion impregnated therein and having a plurality of reinforcing fibers lined up in a predetermined direction, and satisfies the following conditions (1) to (4); and a formed body: (1) A void content of the thermoplastic composite material is 3% or less, (2) A fiber volume fraction of the thermoplastic composite material is 40% or more and 70% or less, (3) A bending strength of a laminated body, in which a plurality of layers of the thermoplastic composite material has been laminated so that the reinforcing fibers would be lined up in one direction, when bent in the fiber-axis direction and measured in conformity to JIS K7074, is 250 MPa or more, and a bending elastic modulus of the laminated body is 90 GPa or more, and(4) A variation coefficient of the bending strength, when measured at N=5 or more and calculated in conformity to JIS K7074, is within 7%.

Thermoplastic composite material and formed body

Provided are a current collector which has an excellent high-rate property and exerts a sufficient safety function when employed in a secondary battery or a capacitor, as well as an electrode, a secondary battery or a capacitor in which said current collector is employed. According to the invention, a current collector is provided which comprises: metal foil; and a conductive layer with a film thickness of 0.1 &#x3bc;m to 10 &#x3bc;m formed on a surface of said metal foil. Here, said conductive layer includes a conductive material and a binder material. A melting point of said binder material is 80&#xb0; C. to 150&#xb0; C. Further, said binder material shows, in differential scanning calorimetry (DSC) in a range from room temperature to 200&#xb0; C., one or more endothermic peaks in the heating-up process. In a case where said binder material shows two or more endothermic peaks, each difference between said peaks is 15&#xb0; C. or more. Moreover, said binder material shows one or more exothermic peaks in the cooling-down process. In a case where said binder material shows only one exothermic peak, said exothermic peak falls within a range of 50 to 120&#xb0; C., and a width at half maximum of said exothermic peak is 10&#xb0; C. or less. On the other hand, in a case where said binder material shows two or more exothermic peaks, a maximum exothermic peak among said exothermic peaks falls within a range of 50 to 120&#xb0; C., and a width at half maximum of said exothermic peak is 10&#xb0; C. or less.

Current collector, electrode, secondary battery and capacitor

Growing community of inventors

Chiyoda-ku, Japan

Takayori Ito