Abstract: To produce an SiO powder having a rounded spherical particulate shape and a small particle diameter; and further having a low degree of impurity contamination, efficiently and economically. A mixture of Si and SiO2 as an SiO gas generation raw material 9 is loaded into a crucible 2. The mixture in the crucible 2 is heated under a reduced pressure so as to generate SiO gas. The generated SiO gas is accumulated on a deposition base 5 rotating on the crucible 2. When SiO deposit 10 accumulated on the deposition base 5 is scraped off with a blade 7, a tip of the blade 7 is separated from a surface of the deposition base 5, and in a state in which a portion of the SiO deposit 10 accumulated on the deposition base 5 is left on the deposition base 5, the remaining SiO deposit 10 is scraped off by the blade 7 and collected as an SiO powder 11.

Abstract: [Problem to be solved] To produce an SiO powder having a rounded spherical particulate shape and a small particle diameter; and further having a low degree of impurity contamination, efficiently and economically. [Solution] A mixture of Si and SiO2 as an SiO gas generation raw material 9 is loaded into a crucible 2. The mixture in the crucible 2 is heated under a reduced pressure so as to generate SiO gas. The generated SiO gas is accumulated on a deposition base 5 rotating on the crucible 2. When SiO deposit 10 accumulated on the deposition base 5 is scraped off with a blade 7, a tip of the blade 7 is separated from a surface of the deposition base 5, and in a state in which a portion of the SiO deposit 10 accumulated on the deposition base 5 is left on the deposition base 5, the remaining SiO deposit 10 is scraped off by the blade 7 and collected as an SiO powder 11.

Abstract: In a method for continuously generating silicon monoxide (SiO) gas, wherein a silicon monoxide gas-generating raw material in a raw material supply unit is continuously charged into a reaction chamber RM, an inert gas is flowed through the raw material supply unit so as to be directed toward the charging direction of the silicon monoxide gas-generating raw material. The method for continuously generating silicon monoxide gas prevents a decrease in yield of the silicon monoxide (SiO) gas-generating raw material.

Abstract: To produce a silicon oxide-based negative electrode material containing Li and having uniform distribution of a Li concentration both inside particles and between particles although a C-coating film is formed on a surface, and yet in which generation of SiC is suppressed. A SiO gas and a Li gas are simultaneously generated by heating a Si-lithium silicate-containing raw material under reduced pressure. The Si-lithium silicate-containing raw material includes Si, Li, and O, in which a part of the Si is present as a Si simple substance and the Li is present as lithium silicate. By cooling the generated gases, Li-containing silicon oxide having an average composition of SiLixOy (0.05<x<y and 0.5<y<1.5 are satisfied) is prepared. After adjusting the particle size, a C-coating film having an average film thickness of 0.5 to 10 nm is formed on a surface of particles at a treatment temperature of 900° C. or less.

Abstract: [Problem] Provided is a silicon oxide-based negative electrode material capable of avoiding, as much as possible, decreased battery performance resulting from a heterogeneous distribution of a Li concentration. [Solution] Provided is a powder having an average composition of SiLixOy wherein 0.05<x<y<1.2 and a mean particle size of 1 ?m or more. Further, 10 particles randomly selected from particles of the powder each satisfy 0.8<L1/L2<1.2 with the standard deviation of L2 being 0.1 or less, L1 being a Li concentration at a depth of 50 nm from an outermost surface of each of the 10 particles, and L2 being a Li concentration at a depth of 400 nm from the outermost surface.

Abstract: To produce a silicon oxide-based negative electrode material containing Li and having uniform distribution of a Li concentration both inside particles and between particles although a C-coating film is formed on a surface, and yet in which generation of SiC is suppressed. A SiO gas and a Li gas are simultaneously generated by heating a Si-lithium silicate-containing raw material under reduced pressure. The Si-lithium silicate-containing raw material includes Si, Li, and O, in which a part of the Si is present as a Si simple substance and the Li is present as lithium silicate. By cooling the generated gases, Li-containing silicon oxide having an average composition of SiLixOy (0.05<x<y and 0.5<y<1.5 are satisfied) is prepared. After adjusting the particle size, a C-coating film having an average film thickness of 0.5 to 10 nm is formed on a surface of particles at a treatment temperature of 900° C. or less.

Abstract: To produce a silicon oxide-based negative electrode material containing Li and having uniform distribution of a Li concentration both inside particles and between particles although a C-coating film is formed on a surface, and yet in which generation of SiC is suppressed. A SiO gas and a Li gas are simultaneously generated by heating a Si-lithium silicate-containing raw material under reduced pressure. The Si-lithium silicate-containing raw material includes Si, Li, and O, in which a part of the Si is present as a Si simple substance and the Li is present as lithium silicate. By cooling the generated gases, Li-containing silicon oxide having an average composition of SiLixOy (0.05<x<y and 0.5<y<1.5 are satisfied) is prepared. After adjusting the particle size, a C-coating film having an average film thickness of 0.5 to 10 nm is formed on a surface of particles at a treatment temperature of 900° C. or less.

Abstract: [Problem to be solved] To produce an SiO powder having a rounded spherical particulate shape and a small particle diameter; and further having a low degree of impurity contamination, efficiently and economically. [Solution] A mixture of Si and SiO2 as an SiO gas generation raw material 9 is loaded into a crucible 2. The mixture in the crucible 2 is heated under a reduced pressure so as to generate SiO gas. The generated SiO gas is accumulated on a deposition base 5 rotating on the crucible 2. When SiO deposit 10 accumulated on the deposition base 5 is scraped off with a blade 7, a tip of the blade 7 is separated from a surface of the deposition base 5, and in a state in which a portion of the SiO deposit 10 accumulated on the deposition base 5 is left on the deposition base 5, the remaining SiO deposit 10 is scraped off by the blade 7 and collected as an SiO powder 11.

Abstract: [Problem] Provided is a silicon oxide-based negative electrode material capable of avoiding, as much as possible, decreased battery performance resulting from a heterogeneous distribution of a Li concentration. [Solution] Provided is a powder having an average composition of SiLixOy wherein 0.05<x<y<1.2 and a mean particle size of 1 ?m or more. Further, 10 particles randomly selected from particles of the powder each satisfy 0.8<L1/L2<1.2 with the standard deviation of L2 being 0.1 or less, L1 being a Li concentration at a depth of 50 nm from an outermost surface of each of the 10 particles, and L2 being a Li concentration at a depth of 400 nm from the outermost surface.

Abstract: [Problem] Provided is a silicon oxide-based negative electrode material capable of avoiding, as much as possible, decreased battery performance resulting from a heterogeneous distribution of a Li concentration. [Solution] Provided is a powder having an average composition of SiLixOy wherein 0.05<x<y<1.2 and a mean particle size of 1 ?m or more. Further, 10 particles randomly selected from particles of the powder each satisfy 0.8<L1/L2<1.2 with the standard deviation of L2 being 0.1 or less, L1 being a Li concentration at a depth of 50 nm from an outermost surface of each of the 10 particles, and L2 being a Li concentration at a depth of 400 nm from the outermost surface.

Abstract: To produce a silicon oxide-based negative electrode material containing Li and having uniform distribution of a Li concentration both inside particles and between particles although a C-coating film is formed on a surface, and yet in which generation of SiC is suppressed. A SiO gas and a Li gas are simultaneously generated by heating a Si-lithium silicate-containing raw material under reduced pressure. The Si-lithium silicate-containing raw material includes Si, Li, and O, in which a part of the Si is present as a Si simple substance and the Li is present as lithium silicate. By cooling the generated gases, Li-containing silicon oxide having an average composition of SiLixOy (0.05<x<y and 0.5<y<1.5 are satisfied) is prepared. After adjusting the particle size, a C-coating film having an average film thickness of 0.5 to 10 nm is formed on a surface of particles at a treatment temperature of 900° C. or less.

Abstract: There is produced a Li-containing silicon oxide powder containing a crystallized lithium silicate that is mostly water-insoluble Li2Si2O5 and containing little crystalline Si. This object is attained through the mixing of a lower silicon oxide powder represented by a compositional formula SiOx (0.5<x<1.5) with a powdered lithium source that involves grinding of the powdered lithium source; controlling a median diameter D1 of the lower silicon oxide powder and a median diameter D2 of the powdered lithium source so as to fulfill 0.05?D2/D1?2; and calcining the mixed powder at 300° C. or higher and 800° C. or lower.

Abstract: There is produced a Li-containing silicon oxide powder containing a crystallized lithium silicate that is mostly water-insoluble Li2Si2O5 and containing little crystalline Si. This object is attained through the mixing of a lower silicon oxide powder represented by a compositional formula SiOx (0.5<x<1.5) with a powdered lithium source that involves grinding of the powdered lithium source; controlling a median diameter D1 of the lower silicon oxide powder and a median diameter D2 of the powdered lithium source so as to fulfill 0.05?D2/D1?2; and calcining the mixed powder at 300° C. or higher and 800° C. or lower.

Abstract: There is produced a Li-containing silicon oxide powder containing a crystallized lithium silicate that is mostly water-insoluble Li2Si2O5 and containing little crystalline Si. This object is attained through the mixing of a lower silicon oxide powder represented by a compositional formula SiOx (0.5<x<1.5) with a powdered lithium source that involves grinding of the powdered lithium source; controlling a median diameter D1 of the lower silicon oxide powder and a median diameter D2 of the powdered lithium source so as to fulfill 0.05?D2/D1?2; and calcining the mixed powder at 300° C. or higher and 800° C. or lower.

Abstract: [Problem] Provided is a silicon oxide-based negative electrode material capable of avoiding, as much as possible, decreased battery performance resulting from a heterogeneous distribution of a Li concentration. [Solution] Provided is a powder having an average composition of SiLixOy wherein 0.05<x<y<1.2 and a mean particle size of 1 ?m or more. Further, 10 particles randomly selected from particles of the powder each satisfy 0.8<L1/L2<1.2 with the standard deviation of L2 being 0.1 or less, L1 being a Li concentration at a depth of 50 nm from an outermost surface of each of the 10 particles, and L2 being a Li concentration at a depth of 400 nm from the outermost surface.

Abstract: This invention provides a powder for a negative electrode of a lithium ion secondary battery, which is a powder that includes a silicon oxide powder containing Li. When a molar ratio between Li, Si and O is taken as y:1:x, the average composition of the powder overall satisfies the relation 0.5<x<1.5 and the relation 0.1<y/x<0.8. The volume median diameter of the powder for a negative electrode is within a range from 0.5 to 30 ?m. When X-ray diffraction measurement of the powder is performed using a Cu K? ray, a relation P2/P1?1.0 and a relation P3/P1?1.0 are satisfied, where P1 represents a height of a peak attributed to Li2SiO3, P2 represents a height of a peak attributed to crystalline Si, and P3 represents a height of a peak attributed to Li4SiO4.

Abstract: There is produced a Li-containing silicon oxide powder containing a crystallized lithium silicate that is mostly water-insoluble Li2Si2O5 and containing little crystalline Si. This object is attained through the mixing of a lower silicon oxide powder represented by a compositional formula SiOx (0.5<x<1.5) with a powdered lithium source that involves grinding of the powdered lithium source; controlling a median diameter D1 of the lower silicon oxide powder and a median diameter D2 of the powdered lithium source so as to fulfill 0.05?D2/D1?2; and calcining the mixed powder at 300° C. or higher and 800° C. or lower.

Abstract: A silicon oxide for use as a negative electrode active material of a lithium-ion secondary battery is characterized by: a g-value measured by an ESR spectrometer is in the range of not less than 2.0020 to not more than 2.0050; and given that A, B, and C are the area intensities of peaks near 420 cm?1, 490 cm?1 and 520 cm?1 respectively in a Raman spectrum measured by a Raman spectroscopy, A/B is not less than 0.5 and C/B is not more than 2. The lithium-ion secondary battery has excellent cycle characteristic and initial efficiency in addition to high capacity. The silicon oxide preferably has a spin density in the range of not less than 1×1017 spins/g to not more than 5×1019 spins/g. A negative electrode material for the lithium-ion secondary battery contains not less than 20% by mass of this silicon oxide as a negative electrode active material.

Abstract: A negative electrode material powder for a lithium ion secondary battery having a conductive carbon film on the surface of a lower-silicon-oxide powder; wherein a specific surface area in BET measurement ranges from more than 0.3 m2/g to 40 m2/g, and no SiC peak appears at 2?=35.6°±0.01° or the half-value width of the appeared peak is 2° or more in XRD measurement using CuK? rays. The proportion of said carbon film preferably ranges from 0.2% to 2.5% by mass. Said powder preferably has 100000 ?cm or less of specific resistance. In XRD, P2/P1<0.01 is preferably satisfied between the highest value P1 of halo of SiOx and a value P2 of the strongest linear peak of Si (111) above the halo. Accordingly, said powder can be used in the secondary battery with a large discharge capacity and a preferable cycle characteristics for practical use.

Abstract: In a lithium ion secondary battery using a negative electrode material powder including a lower silicon oxide powder as a negative electrode material, a charge electric potential at 0.45-1.0 V relative to a Li reference upon initial charging results in a lithium ion secondary battery having a large discharge capacity with excellent cycle characteristics, which can be durable in practical use. On this occasion, the charge electric potential being 0.45-1.0 V relative to the Li reference upon initial charging means that an electric potential plateau caused by the generation of Li-silicate is observed, and the Li-silicate is uniformly generated in the negative electrode material, and this results in excellent cycle characteristics. The negative electrode material powder can have an electrically conductive carbon film on the surface with a ratio of the carbon film to the surface of the powder to be 0.2-10 mass %.