Shin-Etsu Chemical Co., Ltd.

Hirofumi Fukuoka

Mikio Aramata

Susumu Ueno

Satoru Miyawaki

Masanori Fukuhira

Takeshi Fukuda

Kazuma Momii

Koichiro Watanabe

Yoshiharu Konya

Meguru Kashida

Tetsuya Inukai

Toshio Ohba

Mutsuo Shimizu

Mitsugu Saito

Kouichi Urano

Masaki Watanabe

Hidetaka Konno

Toshio Shinohara

Tetsuo Nakanishi

Kazutoshi Fujioka

Masanobu Nishimine

Akio Ohori

Kenji O&otilde;ka

Hideaki Shimizu

Hidemitsu Ochiai

Ichiro Ishizaka

A silicon oxide deposit is continuously prepared by feeding a powder feed containing silicon dioxide powder to a reaction chamber, heating the feed at 1,200-1,600&#xb0; C. to produce a silicon oxide vapor, delivering the vapor to a deposition chamber through a transfer line which is maintained at or above the temperature of the reaction chamber, for thereby causing silicon oxide to deposit on a cool substrate, and removing the silicon oxide deposit from the deposition chamber. Two deposition chambers are provided, and the step of delivering the vapor is alternately switched from one to another deposition chamber.

Method and system for the production of silicon oxide deposit

A silicon composite comprises silicon particles whose surface is at least partially coated with a silicon carbide layer. It is prepared by subjecting a silicon powder to thermal CVD with an organic hydrocarbon gas and/or vapor at 900-1,400&#xb0; C., and heating the powder for removing an excess free carbon layer from the surface through oxidative decomposition.

Silicon composite, making method, and non-aqueous electrolyte secondary cell negative electrode material

Silicon oxide particles each comprising an inner portion having an iron content of 10-1,000 ppm and an outer portion having an iron content of up to 30 ppm are suitable as negative electrode active material in nonaqueous electrolyte secondary batteries. Using a negative electrode comprising the silicon oxide particles as active material, a lithium ion secondary battery or electrochemical capacitor having a high capacity and improved cycle performance can be constructed.

Silicon oxide particles, making method, lithium ion secondary battery, and electrochemical capacitor

A silicon oxide material having a cobalt content of 2-200 ppm is provided. A negative electrode is formed using the silicon oxide material as active material. A nonaqueous electrolyte secondary battery constructed using the negative electrode exhibits improved cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide.

Silicon oxide material, making method, negative electrode, lithium ion secondary battery, and electrochemical capacitor

Particulate silicon oxide having a Cu content of 100-20,000 ppm, an Fe content of 20-1,000 ppm, an Al content of up to 1,000 ppm, an average particle size of 0.1-30 &#x3bc;m, and a BET specific surface area of 0.5-30 m/g is used as negative electrode material in constructing a nonaqueous electrolyte secondary battery. The secondary battery is improved in cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide.

Silicon oxide, making method, negative electrode, lithium ion secondary battery, and electrochemical capacitor

A negative electrode material comprising an active material and 1-20 wt % of a polyimide resin binder is suitable for use in non-aqueous electrolyte secondary batteries. The active material comprises silicon oxide particles and 1-50 wt % of silicon particles. The negative electrode exhibits improved cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide. The non-aqueous electrolyte secondary battery has a high initial efficiency and maintains improved performance and efficiency over repeated charge/discharge cycles by virtue of mitigated volumetric changes during charge/discharge cycles.

Non-aqueous electrolyte secondary battery, negative electrode material, and making method

A sintered silicon oxide for film vapor deposition having a density of 1.0 to 2.0 g/cm, three-point flexural strength of at least 50 g/mm, and a BET specific surface area of 0.1 to 20 m/g is provided. When this sintered silicon oxide is used for evaporation source of a film, pin holes and other defects of the film caused by the problematic splash phenomenon can be reliably prevented and stable production of a reliable package material having excellent gas barrier property is been enabled. This invention also provides a method for producing such sintered silicon oxide, and this method can be used in a large scale production without requiring any special technology, and therefore, this method is capable of supplying the market with the sintered silicon oxide at reduced cost.

Sintered silicon oxide for film vapor deposition, its production method, and method for producing silicon oxide vapor deposition film

An efficient method for producing a silicon oxide powder at a low cost is provided. This method comprises the steps of heating a powder mixture of a silicon dioxide powder and a metal silicon powder to a temperature of 1,100 to 1,450&#xb0; C. in an inert gas or under reduced pressure to generate silicon monoxide gas, and precipitating the silicon monoxide gas on a surface of a substrate to produce the silicon oxide powder, and in this method, the silicon dioxide powder has an average particle diameter of up to 1 &#x3bc;m, and the metal silicon powder has an average particle diameter of 30 &#x3bc;m.

Method for producing silicon oxide powder

Silicon composite particles are prepared by sintering primary fine particles of silicon, silicon alloy or silicon oxide together with an organosilicon compound. Sintering of the organosilicon compound results in a silicon-base inorganic compound which serves as a binder. Each particle has the structure that silicon or silicon alloy fine particles are dispersed in the silicon-base inorganic compound binder, and voids are present within the particle.

Silicon composite particles, preparation thereof, and negative electrode material for non-aqueous electrolyte secondary cell

A silicon-silicon oxide-lithium composite comprises a silicon-silicon oxide composite having such a structure that silicon grains having a size of 0.5-50 nm are dispersed in silicon oxide, the silicon-silicon oxide composite being doped with lithium. Using the silicon-silicon oxide-lithium composite as a negative electrode material, a lithium ion secondary cell having a high initial efficiency and improved cycle performance can be constructed.

Silicon-silicon oxide-lithium composite, making method, and non-aqueous electrolyte secondary cell negative electrode material

A Si&#x2014;C&#x2014;O composite powder is obtained by curing a reactive silane or siloxane having crosslinkable groups through heat curing or catalytic reaction into a crosslinked product and sintering the crosslinked product in an inert gas stream at a temperature of 700-1,400&#xb0; C. into an inorganic state. It exhibits satisfactory cycle performance when used as the negative electrode material for non-aqueous electrolyte secondary cells.

Si-C-O composite, making method, and non-aqueous electrolyte secondary cell negative electrode material

A silicon oxide powder can be continuously prepared by feeding a raw material powder mixture containing silicon dioxide powder into a reaction chamber () at a temperature of 1,100-1,600&#xb0; C., to produce a silicon oxide gas, transferring the silicon oxide gas to a deposition chamber () through a transfer conduit () maintained at a temperature of from higher than 1,000&#xb0; C. to 1,300&#xb0; C., causing silicon oxide to deposit on a substrate () which is disposed and cooled in the deposition chamber, scraping the silicon oxide deposit, and recovering the deposit in a recovery chamber (). The method and apparatus is capable of continuous and stable production of amorphous silicon oxide powder of high purity.

Apparatus for the continuous production of silicon oxide powder

A non-aqueous electrolyte secondary battery negative electrode material is provided wherein a negative electrode active material containing a lithium ion-occluding and releasing material which has been treated with an organosilicon base surface treating agent is surface coated with a conductive coating. Using the negative electrode material, a lithium ion secondary battery having a high capacity and improved cycle performance is obtainable.

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Annaka, Japan

Hirofumi Fukuoka