Abstract: 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° 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.

Abstract: 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° C., and heating the powder for removing an excess free carbon layer from the surface through oxidative decomposition.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 ?m, and a BET specific surface area of 0.5-30 m2/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.

Abstract: 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.

Abstract: 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° C., and heating the powder for removing an excess free carbon layer from the surface through oxidative decomposition.

Abstract: 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° 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.

Abstract: According to the present invention, there is provided a silicon oxide for a non-aqueous electrolyte secondary battery negative electrode material wherein the silicon oxide is a carbon-containing silicon oxide obtained by codeposition from a SiO gas and a carbon-containing gas, an the carbon-containing silicon oxide has a carbon content of 0.5 to 30%. As a result, it is possible to provide a silicon oxide which is capable of manufacturing a non-aqueous electrolyte secondary battery having excellent cycle characteristics and a high capacity in case ox using as a negative electrode material, a method for manufacturing the same, and a lithium ion secondary battery and an electrochemical capacitor using the same.

Abstract: 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.

Abstract: 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 ?m, and a BET specific surface area of 0.5-30 m2/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.

Abstract: 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.

Abstract: A silicon oxide material is obtained by cooling and precipitating a gaseous mixture of SiO gas and silicon-containing gas and has an oxygen content of 20-35 wt %. Using the silicon oxide material as a negative electrode active material, a nonaqueous electrolyte secondary battery is constructed that exhibits a high 1st cycle charge/discharge efficiency and improved cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide.

Abstract: 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.

Abstract: A sintered silicon oxide for film vapor deposition having a density of 1.0 to 2.0 g/cm3, three-point flexural strength of at least 50 g/mm2, and a BET specific surface area of 0.1 to 20 m2/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.

Abstract: A silicon oxide material is obtained by cooling and precipitating a gaseous mixture of SiO gas and silicon-containing gas and has an oxygen content of 20-35 wt %. Using the silicon oxide material as a negative electrode active material, a nonaqueous electrolyte secondary battery is constructed that exhibits a high 1st cycle charge/discharge efficiency and improved cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide.

Abstract: A sintered silicon oxide for film vapor deposition having a density of 1.0 to 2.0 g/cm3, three-point flexural strength of at least 50 g/mm2, and a BET specific surface area of 0.1 to 20 m2/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.

Abstract: A sintered silicon oxide for film vapor deposition having a density of 1.0 to 2.0 g/cm3, three-point flexural strength of at least 50 g/mm2, and a BET specific surface area of 0.1 to 20 m2/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.

Abstract: 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° C., and heating the powder for removing an excess free carbon layer from the surface through oxidative decomposition.