Abstract: A negative electrode active material for a non-aqueous electrolyte secondary battery, containing negative electrode active material particles, including silicon compound particles each containing a silicon compound (SiOx: 0.5?x?1.6) and at least one or more of Li2SiO3 and Li2Si2O5, the material includes a phosphate, the negative electrode active material particles each have a surface containing lithium element, and a ratio mp/ml satisfies 0.02?mp/ml?3, where ml represents a molar quantity of the lithium element and contained per unit mass of the particles, and mp represents a molar quantity of phosphorus element contained per unit mass of the particles. Thereby, a negative electrode active material is capable of stabilizing an aqueous negative electrode slurry prepared in producing a negative electrode of a secondary battery, and capable of improving initial charge-discharge characteristics when the negative electrode active material is used for a secondary battery.

Abstract: A negative electrode active material for a non-aqueous electrolyte secondary battery which contains a negative electrode active material particle. The negative electrode active material particle contains a silicon compound particle containing Li2SiO3. When measuring the negative electrode active material particle by X-ray diffraction, a half-value width of a peak derived from the Li2SiO3 (020) plane is in a range from 1.1° to 1.5° inclusive, and formulae (1) to (3) are all satisfied, 1.1?Ib/Ia?1.5??(1) I(24.8°)/Ia?0.5??(2) I(28.4°)/Ia?1.0??(3) where Ia denotes intensity of a peak derived from the Li2SiO3 (020) plane, Ib denotes intensity of a peak derived from the Li2SiO3 (111) plane, I(24.8°) denotes intensity at 2?=24.8°, and I(28.4°) denotes intensity at 2?=28.4°.

Abstract: A negative electrode including: a negative electrode current collector with a roughened surface; and a negative electrode active material layer provided on the negative electrode current collector. The negative electrode active material layer includes: negative electrode active material particles containing a compound of lithium, silicon, and oxygen; and a composite compound filled in interparticle gaps and a surface layer of the negative electrode active material particles, the composite compound at least containing chemically bonded carbon and oxygen atoms, the composite compound not being alloyed with the negative electrode active material particles. A ratio O/Si of the oxygen to the silicon constituting the negative electrode active material particles is in the range of 0.8 or more and 1.2 or less.

Abstract: A negative electrode active material containing a negative electrode active material particle; the negative electrode active material particle including a silicon compound shown by SiOx (0.5?x?1.6), and having a peak in a range of 539 to 541 eV in a XANES spectrum obtained by XANES measurement of the negative electrode active material particle. This provides a negative electrode active material that is capable of increasing battery capacity and improving cycle performance when it is used as a negative electrode active material for a secondary battery.

Abstract: Methods for producing a negative electrode active material particle which includes a silicon compound particle containing a silicon compound that contains oxygen. The methods including preparing a silicon compound particle containing a silicon compound that contains oxygen; inserting Li into the silicon compound particle; and heating, while stirring, the Li-inserted silicon compound particle in a furnace to produce a negative electrode active material particle, wherein 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+.

Abstract: A negative electrode including a negative electrode active material layer including a negative electrode active material including a negative electrode active material particle. The negative electrode active material particle includes a silicon compound particle including a silicon compound (SiOx: 0.5?x?1.6). The silicon compound particle includes crystalline Li2SiO3 in at least part of the silicon compound particle. Among a peak intensity A derived from Li2SiO3, a peak intensity B derived from Si, a peak intensity C derived from Li2Si2O5, and a peak intensity D derived from SiO2 which are obtained from a 29Si-MAS-NMR spectrum of the silicon compound particle, the peak intensity A is the highest intensity, and the peak intensity A and the peak intensity C satisfy a relationship of the following formula 1: Formula 1: 3C<A.

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 active material containing negative electrode active material particles including, silicon compound particles containing a silicon compound containing oxygen, and at least a part of a surface of the silicon compound particles is covered with a carbon layer, wherein the silicon compound particles contain Li6Si2O7 and Li2SiO3. As a result, the negative electrode active material is provided that can increase the battery capacity with the improvement of the initial efficiency, and a capable of realizing sufficient battery cycle characteristics.

Abstract: A negative electrode active material comprising: particles of negative electrode active material, wherein the particles of negative electrode active material contain particles of silicon compound containing a silicon compound (SiOx:0.5?x?1.6), and wherein the particles of silicon compound have, as chemical shift values obtained from a 29Si-MAS-NMR spectrum, an intensity A of a peak derived from amorphous silicon obtained in ?40 to ?60 ppm, an intensity B of a peak derived from silicon dioxide obtained in the vicinity of ?110 ppm, and an intensity C of a peak derived from Si obtained in the vicinity of ?83 ppm, which satisfy the following formula 1 and formula 2. B?1.

Abstract: A negative electrode active material including negative electrode active material particles, wherein the negative electrode active material particles contain silicon compound particles containing a silicon compound, the silicon compound particles contain Li2SiO3, at least a part of a surface of the silicon compound particles is covered with a carbon layer, and a surface layer of the negative electrode active material particles contains a substance having a carboxylic acid structure. Provided by this configuration is a negative electrode active material capable of increasing battery capacity due to improved initial efficiency and capable of realizing satisfactory battery cycle characteristics.

Abstract: A negative electrode active material comprising: particles of negative electrode active material, wherein the particles of negative electrode active material contain particles of silicon compound containing a silicon compound (SiOx:0.5?x?1.6), and wherein the particles of silicon compound have, as chemical shift values obtained from a 29Si-MAS-NMR spectrum, an intensity A of a peak derived from amorphous silicon obtained in ?40 to ?60 ppm, an intensity B of a peak derived from silicon dioxide obtained in the vicinity of ?110 ppm, and an intensity C of a peak derived from Si obtained in the vicinity of ?83 ppm, which satisfy the following formula 1 and formula 2. B?1.

Abstract: Methods for producing a negative electrode active material particle which includes a silicon compound particle containing a silicon compound that contains oxygen. The methods including preparing a silicon compound particle containing a silicon compound that contains oxygen; inserting Li into the silicon compound particle; and heating, while stirring, the Li-inserted silicon compound particle in a furnace to produce a negative electrode active material particle, wherein 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+.

Abstract: A negative electrode active material particle including: a silicon compound particle containing a silicon compound that contains oxygen, wherein the silicon compound particle contains a Li compound; and the negative electrode active material particle including aluminum phosphorous composite oxide attached to at least part of the surface, wherein the aluminum phosphorous composite oxide is a composite of P2O5 and Al2O3, and the P2O5 and the Al2O3 are in a mass ratio in a range of 1.2<mass of the P2O5/mass of the Al2O3<3.0, wherein the negative electrode active material particle including aluminum phosphorous composite oxide has at least one peak in a region of a binding energy of more than 135 eV and 144 eV or less in a P 2p peak shape given in an X-ray photoelectron spectroscopy.

Abstract: A negative electrode active material for a non-aqueous electrolyte secondary battery, containing a negative electrode active material particle, wherein the negative electrode active material particle includes a silicon compound particle containing a silicon compound (SiOx: 0.5?x?1.6), the silicon compound particle contains a Li compound, at least a part of the silicon compound particle is coated with a carbon material, and an O-component fragment and a CH-component fragment are detected from the negative electrode active material particle in a measurement by TOF-SIMS, and a ratio of a peak intensity A of the O-component fragment to a peak intensity B of the CH-component fragment is 0.5?A/B?100. This provides a negative electrode active material for a non-aqueous electrolyte secondary battery capable of increasing battery capacity and improving the cycle characteristics and battery initial efficiency.

Abstract: A negative electrode active material includes: particles of negative electrode active material, the particles of negative electrode active material contain particles of silicon compound containing a silicon compound (SiOx:0.5?x?1.6); the particles of silicon compound contain at least one kind or more of Li2SiO3 and Li4SiO4; the particles of negative electrode active material contain Li2CO3 and LiOH on a surface thereof; and a content of the Li2CO3 is 0.01% by mass or more and 5.00% by mass or less relative to a mass of the particles of negative electrode active material and a content of the LiOH is 0.01% by mass or more and 5.00% by mass or less relative to the mass of the particles of negative electrode active material. Thus a negative electrode active material is capable of improving initial charge/discharge characteristics and the cycle characteristics when used as a negative electrode active material of the secondary battery.

Abstract: A negative electrode active material for a non-aqueous electrolyte secondary battery, containing negative electrode active material particles. The negative electrode active material particles include silicon compound particles each containing a silicon compound (SiOX: 0.5?X?1.6). The silicon compound particle contains at least one or more of amorphous silicon and microcrystalline silicon. The negative electrode active material particles each contain at least one or more of Li2SiO3 and Li2Si2O5 as a Li compound. The negative electrode active material particle contains a compound having a zeolite crystal structure, the compound adhering to a surface layer portion of the negative electrode active material particle. The negative electrode active material has high stability in an aqueous slurry, high capacity, and favorable cycle characteristics and first-time efficiency.

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: A negative electrode active material for a non-aqueous electrolyte secondary battery contains negative electrode active material particles which include silicon compound (SiOx: 0.5?x?1.6) particles. The negative electrode active material particles are at least partially coated with a carbon material, contain one or more selected from Li2SiO3 and Li2Si2O5, and satisfy Ib/Ia?4.8 and Ic/Ia?6.0 in an X-ray diffraction measurement using a Cu-K? line. Ia represents an intensity of a peak around 2?=28.4° attributable to Si obtained by the X-ray diffraction. Ib represents a peak intensity of a peak attributable to Li2SiO3 obtained by the X-ray diffraction. Ic represents a peak intensity of a peak attributable to Li2Si2O5 obtained by the X-ray diffraction. Thus, a negative electrode active material for a non-aqueous electrolyte secondary battery, is stable over a long period even in an aqueous slurry and enables high capacity, favorable cycle characteristics and first-time efficiency.

Abstract: A negative electrode active material containing negative electrode active material particles. The negative electrode active material particles include silicon compound particles each containing an oxygen-containing silicon compound. The silicon compound particle contains at least one of Li2SiO3 and Li2Si2O5. The silicon compound particle has, in a Si K-edge spectrum obtained from a XANES spectrum: a peak P derived from the Li silicate and located near 1847 eV; and a peak Q gentler than the peak P and located near 1851 to 1852 eV. This provides a negative electrode active material that is capable of stabilizing a slurry when the negative electrode active material is used for a secondary battery, and capable of increasing the battery capacity by improving the initial efficiency.

Abstract: A negative electrode active material for a non-aqueous electrolyte secondary battery, containing negative electrode active material particles, including silicon compound particles each containing a silicon compound (SiOx: 0.5?x?1.6) and at least one or more of Li2SiO3 and Li2Si2O5, the material includes a phosphate, the negative electrode active material particles each have a surface containing lithium element, and a ratio mp/ml satisfies 0.02?mp/ml?3, where ml represents a molar quantity of the lithium element and contained per unit mass of the particles, and mp represents a molar quantity of phosphorus element contained per unit mass of the particles. Thereby, a negative electrode active material is capable of stabilizing an aqueous negative electrode slurry prepared in producing a negative electrode of a secondary battery, and capable of improving initial charge-discharge characteristics when the negative electrode active material is used for a secondary battery.