Bridgestone Corporation

Sumitomo Metal Industries, Inc.

Seiko Electronic Components Ltd.

Tadaaki Miyazaki

Takahiro Kawagoe

Takao Ogino

Yoshitomo Masuda

Masao Ogawa

Hiroaki Wada

Koji Takagi

Shinichi Toyosawa

Ryota Fujio

Hideharu Daifuku

Takashi Kitamura

Tadashi Nakajima

Toyoo Harada

Yuko Maeda

Masaki Yoshio

Shigeru Kijima

Haruyuki Kano

Kinya Suzuki

Tadashi Fuse

Isamu Shinoda

Kazuhiro Minagawa

Shoichi Kojima

Kazuo Takayama

A process for the preparation of a silicon carbide sintered body of high purity which has a content of 1 ppm or less of each atom harmful to the manufacture of semiconductor equipment including the step of shaping a silicon carbide powder, calcining the shaped body in a non-oxidizing atmosphere to form a porous body, and subjecting the porous body to reaction sintering while being impregnated with molten metallic silicon. The starting silicon carbide powder also has a content of 1 ppm or less of each harmful atom and it has a free carbon content of not greater than 20% by weight and an average particle diameter of 0.5-20 .mu.m. Such silicon carbide powder can be prepared from a carbon- and silicon-containing starting mixture including at least one liquid hydrolyzable silicon compound and at least one carbonaceous material selected from polymerizable or cross-linkable organic compounds prepared in the presence of a catalyst which is substantially free from harmful atoms by solidifying the starting mixture and heating it so as to react and form silicon carbide.

Process for preparing a silicon carbide sintered body for use in

There is provided a polyaniline having a thickness of 0.3 to 5 mm which is suitable for an electronic material, particularly for an electrode material in a cell. Also provided is a cell comprising a positive electrode, a negative electrode and an electrolyte in which the polyaniline having a thickness of 0.3 to 5 mm is employed in at least one of the positive and negative electrodes, the cell having a high energy density and good cell performance stable for a long period of time.

Polyanilines, process for the preparation thereof and cells using them

A nonaqueous electrolyte secondary battery includes a positive electrode of vanadium pentoxide, a negative electrode of lithium-doped carbonaceous material, and an organic electrolyte liquid containing a lithium salt. The electric capacities of the positive and negative materials are selected such that the electric capacity of the carbonaceous material at a potential of 1 volt or lower vs. lithium counter electrode is 0.8 to 1.8 times the electric capacity of vanadium pentoxide at a potential of 2.5 volts or higher vs. lithium counter electrode. Graphitized mesophase microspheres resulting from carbonization of pitch is preferred carbonaceous material. The battery is improved in both charge/discharge cycle and overdischarge properties.

Nonaqueous electrolyte secondary battery

A secondary cell comprising a positive electrode of an active material in the form of a lithium-containing vanadium oxide Li.sub.1+x V.sub.3 O.sub.8+y which forms a solid solution with silicon or aluminum, a negative electrode of lithium or a lithium alloy, and a nonaqueous electrolytic solution containing lithium ions, the positive electrode has an increased capacity and improved cycle performance.

Nonaqueous electrolyte secondary cell

A secondary cell comprising a metal oxide positive electrode, a lithium negative electrode, and a nonaqueous electrolyte containing lithium ions exhibits a high capacity and a long cycle life when the positive electrode has a limited capacity per unit area.

An electric cell comprising a positive electrode, a negative electrode, and an electrolyte containing a lithium salt is provided wherein the negative electrode has a two-layer structure of a lithium-aluminum alloy layer and an aluminum layer. The cell is fabricated by placing a positive electrode, a negative electrode, and an electrolyte in a cell container comprising positive and negative electrode casings, and forming a seal between the positive and negative electrode casings. The negative electrode is electrochemically formed in situ in the cell container from a lithium-clad aluminum substrate.

Electric cells and process for making the same

In a nonaqueous electrolyte cell comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte containing an alkali metal ion, an electrolytic manganese dioxide which is prepared by subjecting a manganese dioxide-forming electrolytic solution to electrolysis while introducing a gas therein is used as an active material for the positive electrode.

Nonaqueous electrolyte cell

A non-aqueous electrolyte secondary cell is provided which comprises a positive electrode active material of a modified vanadium pentoxide, a negative electrode active material of lithium or lithium alloy, and a non-aqueous electrolyte.

Non-aqueous electrolyte secondary cell

Growing community of inventors

Higashiyamato, Japan

Tadaaki Miyazaki