Abstract: The present disclosure provides primarily a negative electrode active material with reduced volume change during charge-discharge. The negative electrode active material of the disclosure consists of clathrate-type Si particles comprising one or more metals selected from the group consisting of Mo, Fe, Zn, Mg, Pd, Zr, Ag, Co, Cr, Nb and V. A negative electrode active material layer according to the disclosure comprises the negative electrode active material of the disclosure, and a lithium-ion battery of the disclosure comprises the negative electrode active material layer of the disclosure.

Abstract: The present invention aims to provide a sulfide solid electrolyte material with favorable ion conductivity, in which charge and discharge efficiency may be inhibited from decreasing. The object is attained by providing a sulfide solid electrolyte material, including: a Li element; a P element; and a S element, characterized in that the material has a peak at a position of 2?=30.21°±0.50° in X-ray diffraction measurement using a CuK? ray, and the sulfide solid electrolyte material does not substantially include a metallic element belonging to the third group to the sixteenth group.

Abstract: An all-solid-state battery that makes it possible to improve the cycling properties is provided. The all-solid-state battery includes an anode; a cathode; a solid electrolyte layer that is arranged between the anode and the cathode; an anode collector that is connected to the anode; and a cathode collector that is connected to the cathode. In the all-solid-state battery, a metal layer is arranged between the anode and the anode collector and/or between the cathode and the cathode collector, and metal that does not undergo an electrochemical reaction with metal ions under a potential environment where an active material stores and releases the metal ions, and whose percent elongation is no less than 22% is used for the metal layer.

Abstract: A problem of the present invention is to provide a lithium solid battery in which generation of short-circuits caused by dendrite is inhibited. The present invention solves the problem by providing a lithium solid battery comprising a solid electrolyte layer having a sulfide glass containing an ion conductor which has a Li element, a P element and a S element, and having an average pore radius calculated by mercury press-in method being 0.0057 ?m or less.

Abstract: A main object of the present invention is to provide a method for producing a cathode active material for a solid state battery, which is capable of reducing resistance. The present invention solves the problem by providing a method for producing a cathode active material for a solid state battery comprising steps of: a coating step of coating a coating material represented by LixPOy (2?x?4, 3?y?5) on a surface of a cathode active material containing an Ni element and being an oxide by using a sputtering method; and a heat-treating step of forming a coating portion in such a manner that the cathode active material coated with the coating material is heat-treated within a range of 400° C. to 650° C. to diffuse the Ni element into the coating material.

Abstract: A method of producing an active material powder includes (i) an attachment step of obtaining a powder including an active material particle, which stores and releases lithium ions at a potential of 4.5 V or higher based on Li, and a coating layer precursor, which is attached to a surface of the active material particle, by attaching an alkoxide solution containing lithium ions and niobium ions to the surface of the active material particle and drying the attached alkoxide solution; and (ii) a heating step of forming a coating layer on the surface of the active material particle by heating the powder obtained in the attachment step to be within a temperature range of 120° C. to 200° C.

Abstract: The problem is to provide a sulfide solid electrolyte material with favorable Li ion conductivity in a low-temperature environment. The problem is overcome by providing a sulfide solid electrolyte material comprising an M1 element (such as an Li element and an Mg element), an M2 element (such as a Ge element and a P element) and a S element, wherein the sulfide solid electrolyte material has a peak at a position of 2?=29.58°±0.50° in X-ray diffraction measurement using a CuK? ray, does not have a peak at a position of 2?=27.33°±0.50° or slightly having the peak, and a substituted amount ?(%) of the divalent element in the M1 element is in such a range that the sulfide solid electrolyte material exhibits higher Li ion conductance at 0° C. than the case of ?=0.

Abstract: A sulfide solid electrolyte material includes Li, K, Si, P and S elements; a peak at 2?=29.58°±0.50° and not having a peak at a position of 2?=27.33°±0.50° in X-ray diffraction measurement using a CuK? ray, or when a diffraction intensity at the peak of 2?=29.58°±0.50° is regarded as IA and a diffraction intensity at the peak of 2?=27.33°±0.50° is regarded as IB having a peak at the position of 2?=27.33°±0.50°, a value of IB/IA is less than 1; a P element molar fraction (P/(Si+P)) to a Si element total and the P element satisfies 0.5?P/(Si+P)?0.7, and a K element molar fraction (K/(Li+K)) to a Li element total and the K element satisfies 0<K/(Li+K)?0.1.

Abstract: The main object of the present invention is to provide a cathode active material for a lithium battery capable of inhibiting resistance from increasing with time. The present invention attains the object by providing a cathode active material for a lithium battery comprising: a cathode active material containing an Mn element and being an oxide; and a coating portion formed on a surface of the cathode active material, characterized in that the coating portion contains a Li element, a P element, an O element and the Mn element derived from the cathode active material, and a ratio of the Mn element to the P element, (Mn/P) is 1 or more at an interface between the cathode active material and the coating portion.

Abstract: A problem of the present invention is to provide a lithium solid battery in which generation of short-circuits caused by dendrite is inhibited. The present invention solves the problem by providing a lithium solid battery comprising a solid electrolyte layer having a sulfide glass containing an ion conductor which has a Li element, a P element and a S element, and having an average pore radius calculated by mercury press-in method being 0.0057 ?m or less.

Abstract: A main object of the present invention is to provide a method for producing a cathode active material for a solid state battery, which is capable of reducing resistance. The present invention solves the problem by providing a method for producing a cathode active material for a solid state battery comprising steps of: a coating step of coating a coating material represented by LixPOy (2?x?4, 3?y?5) on a surface of a cathode active material containing an Ni element and being an oxide by using a sputtering method; and a heat-treating step of forming a coating portion in such a manner that the cathode active material coated with the coating material is heat-treated within a range of 400° C. to 650° C. to diffuse the Ni element into the coating material.

Abstract: A sulfide solid electrolyte material includes Li, K, Si, P and S elements; a peak at 2?=29.58°±0.50° and not having a peak at a position of 2?=27.33°±0.50° in X-ray diffraction measurement using a CuK? ray, or when a diffraction intensity at the peak of 2?=29.58°±0.50° is regarded as IA and a diffraction intensity at the peak of 2?=27.33°±0.50° is regarded as IB having a peak at the position of 2?=27.33°±0.50°, a value of IB/IA is less than 1; a P element molar fraction (P/(Si+P)) to a Si element total and the P element satisfies 0.5?P/(Si+P)?0.7, and a K element molar fraction (K/(Li+K)) to a Li element total and the K element satisfies 0<K/(Li+K)?0.1.

Abstract: An all-solid-state battery that makes it possible to improve the cycling properties is provided. The all-solid-state battery includes an anode; a cathode; a solid electrolyte layer that is arranged between the anode and the cathode; an anode collector that is connected to the anode; and a cathode collector that is connected to the cathode. In the all-solid-state battery, a metal layer is arranged between the anode and the anode collector and/or between the cathode and the cathode collector, and metal that does not undergo an electrochemical reaction with metal ions under a potential environment where an active material stores and releases the metal ions, and whose percent elongation is no less than 22% is used for the metal layer.

Abstract: The present invention aims to provide a sulfide solid electrolyte material with favorable ion conductivity, in which charge and discharge efficiency may be inhibited from decreasing. The object is attained by providing a sulfide solid electrolyte material, including: a Li element; a P element; and a S element, characterized in that the material has a peak at a position of 2?=30.21°±0.50° in X-ray diffraction measurement using a CuK? ray, and the sulfide solid electrolyte material does not substantially include a metallic element belonging to the third group to the sixteenth group.

Abstract: The main object of the present invention is to provide a cathode active material for a lithium battery capable of inhibiting resistance from increasing with time. The present invention attains the object by providing a cathode active material for a lithium battery comprising: a cathode active material containing an Mn element and being an oxide; and a coating portion formed on a surface of the cathode active material, characterized in that the coating portion contains a Li element, a P element, an O element and the Mn element derived from the cathode active material, and a ratio of the Mn element to the P element, (Mn/P) is 1 or more at an interface between the cathode active material and the coating portion.

Abstract: The problem is to provide a sulfide solid electrolyte material with favorable Li ion conductivity in a low-temperature environment. The problem is overcome by providing a sulfide solid electrolyte material comprising an M1 element (such as an Li element and an Mg element), an M2 element (such as a Ge element and a P element) and a S element, wherein the sulfide solid electrolyte material has a peak at a position of 2?=29.58°±0.50° in X-ray diffraction measurement using a CuK? ray, does not have a peak at a position of 2?=27.33°±0.50° or slightly having the peak, and a substituted amount ?(%) of the divalent element in the M1 element is in such a range that the sulfide solid electrolyte material exhibits higher Li ion conductance at 0° C. than the case of ?=0.

Abstract: A method of producing an active material powder includes (i) an attachment step of obtaining a powder including an active material particle, which stores and releases lithium ions at a potential of 4.5 V or higher based on Li, and a coating layer precursor, which is attached to a surface of the active material particle, by attaching an alkoxide solution containing lithium ions and niobium ions to the surface of the active material particle and drying the attached alkoxide solution; and (ii) a heating step of forming a coating layer on the surface of the active material particle by heating the powder obtained in the attachment step to be within a temperature range of 120° C. to 200° C.