Toray Industries, Inc.

Toray Industies, Inc.

Keizo Ono

Toshiyuki Miyoshi

Makoto Endo

Jun Tsukamoto

Tetsuyuki Kyono

Haruo Obara

Haruki Morikawa

Jun Yamazaki

Shuichi Yamanaka

Masakatsu Shinto

Naoki Shimoyama

Katsumi Yamasaki

Mototada Fukuhara

Ken-ichi Morita

Shigeru Fujii

Hideo Saruyama

Isamu Sakuma

Tatsuhiko Suzuki

Takeharu Inoue

Mototada Hukuhara

Naoki Iwasaki

Kenji Mitsuyasu

Process for producing a precursor fiber bundle and a carbon fiber bundle

Applying a sizing agent as a water dispersed sizing agent to a continuous carbon fiber bundle consisting of 20,000 to 150,000 filaments, controlling the packing density in a range of 5,000 to 20,000 D/mm, cutting the carbon fiber bundle in a wet state of 10 to 35 wt % in solution content at the time of cutting, and drying with vibration at a solution content of 15 to 45 wt % before drying.

Process for producing chopped carbon fibers

Precursor fiber bundle for production of a carbon fiber bundle, a process for producing the precursor fiber bundle, a carbon fiber bundle, and a process for producing the carbon fiber bundle

A bundle of short chopped carbon fibers impregnated with a sizing agent, the short fiber bundle having an average weight per unit length of 1.7 to 4 mg/mm in the fiber length direction and a coefficient of variation of 30 to 60% in the distribution of weight per unit length in the fiber length direction.

Chopped carbon fibers and a production process there of

An amorphous carbon material, especially for an electrode of a lithium ion secondary battery, is characterized by an interlayer spacing d(002), obtained from the X-ray diffraction line assigned to the (002) plane of the carbon, of 0.345 nm to 0.365 nm, a ratio (Ps) os the number of carbon atoms involved in the layer structure to the total number of carbon atoms of from 0.54 to 0.85, and a ratio of the total nitrogen:total carbon atoms in the amorphous carbon of 0.005:1 to 0.055:1. The amorphous carbon material is prepared by applying a heat treatment to an amorphous carbon under under vacuum or inert gas atmosphere for at least 30 minutes to provide the desired crystalline structure. The carbon material may take the form of carbon fiber material, especially short carbon fibers obtained by pulverizing larger carbon fibers. A lithium ion secondary battery containing an electrode comprising such an amorphous carbon material has a large discharge capacity and high charge-discharge cycle characteristics.

Amorphous carbon electrode and a secondary battery having such an

Electrode for battery and process for producing electrode for batteries

A graphite fiber having an elastic modulus E of 340-680 GPa, a microvoid radius of not larger than 20 .ANG. and a crystal size L.sub.c (.ANG.) satisfying the following formula:

Process of making graphite fiber

An improved electric resistance heating element made of a carbon material, provided around its surface with a layer essentially comprising carbon fiber, and an improved electric resistance heating furnace using the heating element.

Electric resistance heating element and electric resistance heating

Growing community of inventors

Ehime, Japan

Keizo Ono