Abstract: The nonaqueous electrolyte secondary battery provided by the present invention has a positive electrode 50 that has a positive electrode active material layer 54, a negative electrode 60 that has a negative electrode active material layer 64, and separators 70, 72 interposed between the positive electrode active material layer 54 and the negative electrode active material layer 64. The positive electrode active material layer 54 contains a positive electrode active material and an inorganic phosphate compound that contains an alkali metal and/or an alkaline-earth metal. A phosphate ion scavenger that scavenges a phosphate ion is disposed between the positive electrode active material layer 54 and the negative electrode active material layer 64 and/or in the negative electrode active material layer 64.

Abstract: Provided is a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution. The positive electrode includes a positive electrode current collector and a positive electrode active material layer that is formed on the positive electrode current collector. The positive electrode active material layer contains a positive electrode active material, an inorganic phosphate compound having ion conductivity, and a conductive material. The volatile component content in the conductive material is at least 0.15 mass % when measured according to JIS K 6221 (1982).

Abstract: The present invention provides a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode and a non-aqueous electrolyte. The working upper limit potential of the positive electrode is 4.3 V or more with metal lithium as reference. In addition, the positive electrode includes a positive electrode active material layer including a positive electrode active material, an electrically-conductive material having a DBP oil absorption of above 150 ml/100 g, and an inorganic phosphoric acid compound having an ion conductivity.

Abstract: According to the present invention, a nonaqueous electrolyte secondary battery that includes a positive electrode, a negative electrode and a nonaqueous electrolyte is provided. The positive electrode has an operation upper limit potential of 4.3 V or more based on metal lithium and includes a positive electrode active material and an inorganic phosphate compound that has ion conductivity. The inorganic phosphate compound is in a particle state. A ratio of particles having a particle size of 20 ?m or more is 1% by volume or less when an entirety of the inorganic phosphate compound is set to 100% by volume. Further, a ratio of particles having a particle size of 10 ?m or more may be 10% by volume or less when an entirety of the inorganic phosphate compound is set to 100% by volume.

Abstract: A lithium-ion secondary battery includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes a positive active material layer. The negative electrode includes a negative active material layer. The positive active material layer contains a positive active material and an inorganic phosphate compound. A BET specific surface area of the positive active material is 0.3 m2/g to 1.15 m2/g. The inorganic phosphate compound includes at least one of an alkali metal, an alkaline earth metal, and a hydrogen atom in a chemical formula. A content of the inorganic phosphate compound in the positive active material layer is 0.02 g/m2 to 0.225 g/m2 per unit surface area based on the BET specific surface area of the positive active material. The lithium-ion secondary battery allows an open-circuit voltage of the lithium-ion secondary battery to increase to 4.3 V or higher in terms of metal lithium.

Abstract: A lithium ion secondary battery includes a positive electrode that includes a positive electrode active material layer; a negative electrode that includes a negative electrode active material layer; and a nonaqueous electrolyte. The positive electrode active material layer contains an inorganic phosphate compound and a high-potential positive electrode active material that causes an open-circuit voltage to be 4.3 V or higher with respect to lithium metal. The inorganic phosphate compound is a compound containing at least one hydrogen atom in a chemical formula.

Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode having a positive electrode mixture layer, a negative electrode, and a nonaqueous electrolyte. The positive electrode mixture layer includes a positive electrode active material (1) and an inorganic phosphate. The inorganic phosphate is at least one of a phosphate and a pyrophosphate and includes at least one of alkali metals and second group elements.

Abstract: Provided is a non-aqueous electrolyte secondary battery excellent in durability, the non-aqueous electrolyte secondary battery including a positive electrode active material, the surface of which is coated with a film formed of an inorganic solid electrolyte, wherein a change in volume of the positive electrode active material during charge and discharge is reduced to prevent deterioration of the film with which the surface of the positive electrode active material is coated. In a non-aqueous electrolyte secondary battery including a positive electrode active material, the surface of which is coated with a film formed of an inorganic solid electrolyte, the positive electrode active material is a lithium-containing composite oxide having a spinel structure, and contains at least one of Ti and Mg as an additional element.