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 SiO, (0.5×1.6), 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: 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 a non-aqueous electrolyte secondary battery, wherein the negative electrode active material includes negative electrode active material particles, the negative electrode active material particles include a silicon compound particle which includes a silicon compound including oxygen, the silicon compound particle includes a Li compound, and the silicon compound particle is adhered with a phosphate salt in an outermost surface layer thereof. With this, the negative electrode active material which is high in the capacity and the stability to aqueous slurry as well as excellent in the cycle characteristic and the first efficiency can be provided.

Abstract: The objective of the present invention is to provide a negative electrode for a nonaqueous-electrolyte secondary cell, the negative electrode being predoped by immersion in a solution containing ions of an alkali metal and a catalyst, wherein the weight and volume of the negative electrode tend not to increase due to the predoping, and it is possible to further increase initial charge/discharge efficiency.

Abstract: A negative electrode active material includes 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 Li2Si2O5 in at least part of the silicon compound particle. Among peak intensities A derived from Li2SiO3, B derived from Si, a peak intensity C derived from Li2Si2O5, and D derived from SiO2 which are obtained from a 29Si-MAS-NMR spectrum of the silicon compound particle, the peak intensity C is the highest intensity, and the peak intensity A and the peak intensity C satisfy a relationship of the formula A<C/3. Thus, a negative electrode active material stabilizes a slurry prepared when a negative electrode of a secondary battery is prepared, and improves initial charge and discharge and cycle characteristics when used as a negative electrode active material for a secondary battery.

Abstract: A negative electrode active material which is a negative electrode active material containing particles of a negative electrode active material, wherein the particles of the negative electrode active material contain particles of a silicon compound which contain a silicon compound (SiOx: 0.5?x?1.6), the particles of the negative electrode active material contain lithium, and the particles of the negative electrode active material have a peak in the range of 2?=31.8±0.5° measured by X-ray diffraction spectrum using K? line of Cu. According to this constitution, it is provided a negative electrode active material capable of improving cycle characteristics and initial charge and discharge characteristics when it is used as a negative electrode active material of a lithium ion secondary battery.

Abstract: A negative electrode active material contains particles of negative electrode active material, wherein the particles of negative electrode active material contain a silicon compound represented by SiOx (0.5?x?1.6), and when the particles of negative electrode active material are measured by an atom probe method, and an Si 75% equivalent concentration surface obtained by the atom probe method is defined to be a boundary surface of a silicon grain, an average diameter of the silicon grains at a center portion of the particle in the particles of negative electrode active material is in the range of 0.25 nm to 5 nm. According to this constitution, when it is used as the negative electrode active material of a secondary battery, a negative electrode active material is capable of increasing battery capacity and improving cycle characteristics.

Abstract: The present invention is a negative electrode active material for a negative electrode active material layer of a lithium ion secondary battery, wherein: the negative electrode active material comprises silicon-based material consisting of SiOx (0.5?x?1.6); and the negative electrode active material has two or more peaks in a region of a bond energy ranging from 520 eV to 537 eV in an O 1s peak shape given in an X-ray photoelectron spectroscopy. As a result, it is possible to provide a negative electrode active material in which a battery capacity can be increased and cycle characteristics and initial charge/discharge characteristics can be improved when used as a negative electrode active material for a lithium ion secondary battery.

Abstract: A negative electrode active material including a negative electrode active material particle, wherein the negative electrode active material particle includes a silicon compound particle comprising a silicon compound (SiOx: 0.5?x?1.6), the silicon compound particle includes crystalline Li2SiO3 and Li2Si2O5 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 or the peak intensity C is the highest intensity, and the peak intensity A and the peak intensity C satisfy a relationship of the following formula 1,formula 1: C/3?A?3C.

Abstract: 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.

Abstract: A negative electrode active material including a negative electrode active material particle; the negative electrode active material particle including a silicon compound shown by SiO, (0.5?x?1.6), wherein at least part of the Si4+ contained in the negative electrode active material particle is to be changed to at least one state selected from valence states of Siy+ (y is any of 0, 1, 2, and 3) in occlusion of Li in the negative electrode active material. 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: A production method of a negative electrode active material for non-aqueous electrolyte secondary batteries containing particles of lithium-containing silicon compound includes: preparing particles of silicon compound containing a silicon compound (SiOx: 0.5?x?1.6); obtaining particles of lithium-containing silicon compound by making the particle of silicon compound contact with a solution A that contains lithium and has an ether-based solvent as a solvent; and heating the particles of the lithium-containing silicon compound. A production method of a negative electrode active material for non-aqueous electrolyte secondary batteries is capable of increasing battery capacity of the negative electrode active material and capable of improving the first time efficiency and cycle characteristics.

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 includes particles of negative electrode active material, wherein the particles of negative electrode active material contain particles of silicon compound containing silicon compound (SiOx:0.5?x?1.6), the particles of negative electrode active material contain crystalline Li2SiO3 in at least a part thereof, and the particles of negative electrode active material satisfy the following formula 1 and formula 2 between an intensity A of a peak derived from Li2SiO3, an intensity B of a peak derived from Si, an intensity C of a peak derived from Li2Si2O5, and an intensity D of a peak derived from SiO2, which are obtained from a 29Si-MAS-NMR spectrum. Thus a negative electrode active material capable of increasing a battery capacity, and improving the cycle characteristics and initial charge/discharge characteristics when used as a negative electrode active material of the lithium ion secondary battery is provided.

Abstract: A battery capable of improving the cycle characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The anode includes an anode active material layer containing an anode active material having silicon as an element, and a coating layer that coats the anode active material layer, and contains an oxide of a 3d transition metal element at least one selected from the group consisting of iron, cobalt, and nickel.

Abstract: A negative electrode active material, wherein the negative electrode active material is a negative electrode active material including negative electrode active material particles; the negative electrode active material particles include silicon compound particles including a silicon compound (SiOx: 0.5?x?1.6); the silicon compound particles include at least any one kind or more kinds of Li2SiO3 and Li4SiO4; the negative electrode active material particles have a loose bulk density BD of 0.5 g/cm3 or more and 0.9 g/cm3 or less, a tapped bulk density TD of 0.7 g/cm3 or more and 1.2 g/cm3 or less, and a compression degree of 25% or less, the compression degree being defined by (TD?BD)/TD. Therefore, the negative electrode active material which is capable of improving the initial charge and discharge characteristics as well as the cycle characteristics upon using it as the negative electrode active material of a secondary battery is provided.

Abstract: A negative electrode active material contains particle of the negative electrode active material, wherein the particle of the negative electrode active material contains particle of a silicon compound which contains a silicon compound (SiOx: 0.5?x?1.6), the particle of the silicon compound contains lithium, and the particle of the negative electrode active material has a total content rate of a polyphenylene compound component and a polycyclic aromatic component measured by TPD-MS of 1 ppm by mass or more and 4,000 ppm by mass or less. As a result, a negative electrode active material is capable of improving cycle characteristics and initial charge/discharge characteristics when it is used as a negative electrode active material of a lithium ion secondary battery.

Abstract: A battery including an anode with an anode active material layer that includes anode active material particles made of an anode active material including at least one of silicon and tin as an element. An oxide-containing film including an oxide of at least one kind selected from the group consisting of silicon, germanium and tin is formed in a region of the surface of each anode active material particle in contact with an electrolytic solution by a liquid-phase method such as a liquid-phase deposition method. The region in contact with the electrolytic solution of the surface of each anode active material particle is covered with the oxide-containing film. The thickness of the oxide-containing film is preferably within a range from 0.1 nm to 500 nm both inclusive.

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 containing in its interior a lithium compound and one or more ions selected from Group 1 metal ions, Group 2 metal ions, and substitutable ammonium ions. This negative electrode material for a non-aqueous electrolyte secondary battery can increase the battery capacity and improve the cycle performance and the battery initial efficiency.