Abstract: A negative electrode active material for nonaqueous electrolyte secondary batteries including: a particle of negative electrode active material, wherein the particle of negative electrode active material contains a particle of silicon compound containing a silicon compound (SiOx:0.5?x?1.6), on at least a part of a surface of the silicon compound a carbon coating film being formed, and the negative electrode active material contains 2% by mass or less of particle of silicon dioxide and the negative electrode active material contains a silicon dioxide-carbon composite secondary particle containing a plurality of the particles of silicon dioxide and carbon. As a result, the negative electrode active material for nonaqueous electrolyte secondary batteries capable of increasing battery capacity and improving the cycle characteristics and battery initial efficiency is provided.

Abstract: A negative electrode active material contains a negative electrode active material particle which includes a silicon compound particle containing a silicon compound that contains oxygen. The silicon compound particle contains a Li compound, and at least part of Si constituting the silicon compound particle is present in at least one state selected from oxide of Si2+ to Si3+ containing no Li, and compound containing Li and Si2+ to Si3+. A negative electrode active material is capable of increasing battery capacity and improving cycle characteristics and initial charge-discharge characteristics when the negative electrode active material is used for a secondary battery. A mixed negative electrode active material contains the negative electrode active material. A method produces a negative electrode active material particle which enables production of the negative electrode active material particle to be contained in the negative electrode active material as described above.

Abstract: The present invention is a negative electrode material for a non-aqueous electrolyte secondary battery, including negative electrode active material particles containing a silicon compound expressed by SiOx where 0.5?x?1.6, the silicon compound being coated with a carbon coating layer composed of a carbon component, wherein the negative electrode active material particles contain a SiO2 component having a tridymite structure and exhibit a diffraction peak around 21.825° with a half width (2?) of 0.15° or less in X-ray diffraction. This negative electrode material for a non-aqueous electrolyte secondary battery can increase the battery capacity and improve the cycle performance and the initial charge and discharge performance.

Abstract: A negative electrode active material containing a negative electrode active material particle which includes a silicon compound particle containing a silicon compound (SiOx: 0.5?x?1.6). The silicon compound particle has three or more peaks in a chemical shift value ranging from ?40 ppm to ?120 ppm but has no peak in a chemical shift value within a range of ?65±3 ppm in a spectrum obtained from 29Si-MAS-NMR of the silicon compound particle. This provides a negative electrode active material capable of improving cycle characteristics when it is used as a negative electrode active material for a secondary battery.

Abstract: A negative electrode material containing a negative electrode active material particle which includes a silicon compound particle containing a silicon compound (SiOx: 0.5?x?1.6). The silicon compound particle contains at least one or more of Li2SiO3 and Li4SiO4, and the negative electrode material further contains at least one of a metal compound particle containing a metal compound and an aggregate of the metal compound particle. The negative electrode material is capable of stabilizing a slurry prepared in production of a negative electrode for a secondary battery, and improving initial charge-discharge characteristics and cycle characteristics when it is used as a negative electrode active material for a secondary battery.

Abstract: A negative electrode active material for a non-aqueous electrolyte secondary battery, including negative electrode active material particles containing a silicon compound (SiOx where 0.5?x?1.6), the negative electrode active material particles being coated with a carbon coating composed of a substance at least partially containing carbon, the carbon coating having a density ranging from 1.2 g/cm3 to 1.9 g/cm3, the negative electrode active material particles having a characteristic of type II or type III adsorption-desorption isotherm in the IUPAC classification, as obtained by adsorption-desorption isotherm measurement with nitrogen gas. This negative electrode active material can increase the battery capacity and improve the cycle performance and battery initial efficiency.

Abstract: The present invention is directed to a negative electrode material for a non-aqueous electrolyte secondary battery, including a conductive powder composed of silicon-based active material particles coated with a conductive carbon film, in which the conductive carbon film exhibits a d-band having a peak half width of 100 cm?1 or more as determined from a Raman spectrum of the conductive carbon film. The invention provides a negative electrode material for a non-aqueous electrolyte secondary battery that has excellent cycle performance and keeps high charge and discharge capacity due to use of a silicon-based active material, a method of producing the negative electrode material for a non-aqueous electrolyte secondary battery, and a non-aqueous electrolyte secondary battery.

Abstract: A negative electrode active material contains a negative electrode active material particle; the negative electrode active material particle including a silicon compound particle containing a silicon compound (SiOx: 0.5?x?1.6), wherein the silicon compound particle contains a Li compound, and the negative electrode active material particle contains at least one kind of salt selected from salts of polyacrylic acid and salts of carboxymethyl cellulose, together with a metal salt containing at least one kind of metal selected from Mg and Al. This provides a negative electrode active material that is capable of stabilizing slurry that is produced in production of a negative electrode for a secondary battery, and improving initial charge-discharge characteristics and cycle performance when it is used as a negative electrode active material for a secondary battery.

Abstract: A negative electrode active material containing a negative electrode active material particle; the negative electrode active material particle including a silicon compound particle containing a silicon compound (SiOx: 0.5?x?1.6), wherein the silicon compound particle contains a Li compound, and the negative electrode active material particle contains an Al element and an Na element as constituent elements, with a mass ratio MNa/MAl of the Al element and the Na element satisfying the following Formula 1. This provides a negative electrode active material that is capable of stabilizing slurry that is produced in production of a negative electrode for a secondary battery, and improving initial charge-discharge characteristics and cycle performance when it is used as a negative electrode active material for a secondary battery. 0.

Abstract: A negative electrode active material for nonaqueous electrolyte secondary batteries including: a particle of negative electrode active material, wherein the particle of negative electrode active material contains a particle of silicon compound containing a silicon compound (SiOx:0.5?x?1.6), on at least a part of a surface of the silicon compound a carbon coating film being formed, and the negative electrode active material contains 2% by mass or less of particle of silicon dioxide and the negative electrode active material contains a silicon dioxide-carbon composite secondary particle containing a plurality of the particles of silicon dioxide and carbon. As a result, the negative electrode active material for nonaqueous electrolyte secondary batteries capable of increasing battery capacity and improving the cycle characteristics and battery initial efficiency is provided.

Abstract: The invention provides a rotary tubular furnace including a rotatable furnace tube having an inlet end through which silicon compound particles (SiOx where 0.5?x<1.6) are put therein and an outlet end through which the particles coated with carbon are taken out therefrom; and a heating chamber having a heater to heat the furnace tube, wherein the furnace tube is composed of a heat portion inside the heating chamber and a non-heat portion outside the heating chamber, a length B of the heat portion and an overall length A of the furnace tube satisfy 0.4?B/A<1, and a distance C between the heat portion and the outlet end and the overall length A satisfy 0.04?C/A?0.35. This furnace can inhibit clogging of the furnace tube and mass-produce a negative electrode active material for a non-aqueous electrolyte secondary battery having a high capacity with inhibited variations in the amount of carbon coating and crystallinity.

Abstract: A negative electrode active material for a non-aqueous electrolyte secondary battery, wherein: negative electrode active material particles that contain a silicon compound (SiOx: 0.5?x?1.6) having a carbon coating on a surface, wherein the carbon coating exhibits a G?-band peak at a Raman shift in a range of 2600 cm?1 to 2760 cm?1 and a G-band peak at a Raman shift in a range of 1500 cm?1 to 1660 cm?1 in a Raman spectrum obtained by Raman spectrometry, and the G?-band peak and the G-band peak satisfy 0<IG?/IG?0.6 where IG? and IG are intensities of the G?-band peak and the G-band peak, respectively. This provides a negative electrode active material having a high capacity retention rate and high initial efficiency.

Abstract: The present invention relates to a negative electrode material for nonaqueous electrolyte secondary batteries, which is composed of a silicon composite body that has a structure wherein microcrystals or fine particles of silicon are dispersed in a substance having a composition different from that of the microcrystals or fine particles, said silicon composite body having a crystallite size of the microcrystals or fine particles of 8.0 nm or less as calculated using Scherrer's equation on the basis of the half width of the diffraction peak belonging to Si(220) in an X-ray diffraction. The present invention is able to provide a negative electrode material for nonaqueous electrolyte secondary batteries, which has excellent coulombic efficiency, and a nonaqueous electrolyte secondary battery.

Abstract: The present invention relates to a negative electrode material for nonaqueous electrolyte secondary batteries, which is composed of a silicon composite body that has a structure wherein microcrystals or fine particles of silicon are dispersed in a substance having a composition different from that of the microcrystals or fine particles, said silicon composite body having a crystallite size of the microcrystals or fine particles of 8.0 nm or less as calculated using Scherrer's equation on the basis of the half width of the diffraction peak belonging to Si(220) in an X-ray diffraction. The present invention is able to provide a negative electrode material for nonaqueous electrolyte secondary batteries, which has excellent coulombic efficiency, and a nonaqueous electrolyte secondary battery.

Abstract: A negative electrode active material for a non-aqueous electrolyte secondary battery, including negative electrode active material particles containing a silicon compound (SiOx where 0.5?x?1.6), the negative electrode active material particles being coated with a carbon coating composed of a substance at least partially containing carbon, the carbon coating having a density ranging from 1.2 g/cm3 to 1.9 g/cm3, the negative electrode active material particles having a characteristic of type II or type III adsorption-desorption isotherm in the IUPAC classification, as obtained by adsorption-desorption isotherm measurement with nitrogen gas. This negative electrode active material can increase the battery capacity and improve the cycle performance and battery initial efficiency.

Abstract: The present invention is a negative electrode material for a non-aqueous electrolyte secondary battery, including negative electrode active material particles containing a silicon compound expressed by SiOx where 0.5?x?1.6, the silicon compound being coated with a carbon coating layer composed of a carbon component, wherein the negative electrode active material particles contain a SiO2 component having a tridymite structure and exhibit a diffraction peak around 21.825° with a half width (2?) of 0.15° or less in X-ray diffraction. This negative electrode material for a non-aqueous electrolyte secondary battery can increase the battery capacity and improve the cycle performance and the initial charge and discharge performance.

Abstract: The present invention is directed to a negative electrode material for a non-aqueous electrolyte secondary battery, including a conductive powder composed of silicon-based active material particles coated with a conductive carbon film, in which the conductive carbon film exhibits a d-band having a peak half width of 100 cm?1 or more as determined from a Raman spectrum of the conductive carbon film. The invention provides a negative electrode material for a non-aqueous electrolyte secondary battery that has excellent cycle performance and keeps high charge and discharge capacity due to use of a silicon-based active material, a method of producing the negative electrode material for a non-aqueous electrolyte secondary battery, and a non-aqueous electrolyte secondary battery.

Abstract: The present invention is a method of producing a negative electrode material for a non-aqueous electrolyte secondary battery, including: preparing silicon-based negative electrode active material particles; and coating each of the prepared particles with a conductive carbon coating by using a rotary kiln while controlling the rotary kiln such that the following relationships (1) and (2) hold true: W/(376.8×R×T2)?1.0??(1); and (T×R2/0.353)?3.0??(2), where R is a rotation rate (rpm) of the furnace tube of the rotary kiln, W is a mass (kg/h) of the particles that are put in the furnace tube per hour, and T is an inner diameter (m) of the furnace tube. This method can not only efficiently produce a negative electrode material that is coated with a uniform carbon coating and crystallinity, but also mass-produce negative electrode materials having a high capacity and a high cycle performance.

Abstract: The invention provides a rotary tubular furnace including a rotatable furnace tube having an inlet end through which silicon compound particles (SiOx where 0.5?x<1.6) are put therein and an outlet end through which the particles coated with carbon are taken out therefrom; and a heating chamber having a heater to heat the furnace tube, wherein the furnace tube is composed of a heat portion inside the heating chamber and a non-heat portion outside the heating chamber, a length B of the heat portion and an overall length A of the furnace tube satisfy 0.4?B/A<1, and a distance C between the heat portion and the outlet end and the overall length A satisfy 0.04?C/A?0.35. This furnace can inhibit clogging of the furnace tube and mass-produce a negative electrode active material for a non-aqueous electrolyte secondary battery having a high capacity with inhibited variations in the amount of carbon coating and crystallinity.

Abstract: The present invention relates to a negative electrode material for nonaqueous electrolyte secondary batteries, which is composed of a silicon composite body that has a structure wherein microcrystals or fine particles of silicon are dispersed in a substance having a composition different from that of the microcrystals or fine particles, said silicon composite body having a crystallite size of the microcrystals or fine particles of 8.0 nm or less as calculated using Scherrer's equation on the basis of the half width of the diffraction peak belonging to Si(220) in an X-ray diffraction. The present invention is able to provide a negative electrode material for nonaqueous electrolyte secondary batteries, which has excellent coulombic efficiency, and a nonaqueous electrolyte secondary battery.