Abstract: This non-aqueous electrolyte secondary battery, which is one example of an embodiment, comprises: a positive electrode that has a positive electrode mixture layer; a negative electrode; a separator that is interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte. The positive electrode mixture layer contains a first lithium-and-transition-metal composite oxide represented by general formula LixNi1?y?zCoyMzO2 (in the formula, 0.8?x?1.2, 0?y?0.2, 0<z?0.5, and M is at least one metal element excluding Li, Ni, and Co), and a second lithium-and-transition-metal composite oxide represented by general formula LiaNi2?a?bMebO2 (in the formula, 0<a?0.5, 0?b?0.5, and Me is at least one metal element excluding Li and Ni). The separator has: a base material; and a surface layer that includes inorganic particles and a binder, and is formed on the surface of the base material facing toward the positive electrode.

Abstract: A positive electrode active material for nonaqueous electrolyte secondary batteries according to one embodiment of the present invention contains: a first lithium transition metal composite oxide that is represented by general formula LixNi1-y-zCoyMzO2 (wherein 0.8?x?1.2, 0?y?0.2, 0<z?0.5, and M represents at least one metal element excluding Li, Ni and Co); and a second lithium transition metal composite oxide that has at least one diffraction peak which has a peak top at a diffraction angle (2?) of from 21.40° to 21.65° in radiation X-ray diffraction (with a light energy of 16 keV).

Abstract: The positive electrode mixture layer of this nonaqueous electrolyte secondary battery positive electrode, which is one exemplary embodiment, contains a first lithium-transition-metal composite oxide represented by general formula LixNi1?y?zCoyMzO2 (in the formula. 0.8?x?1.2, 0?y?0.2, 0<z?0.5, and M is at least one metal element excluding Li, Ni, and Co), a second lithium-transition-metal composite oxide represented by general formula LiaNi2?a?bMebO2 (in the formula, 0<a?0.5, 0?b?0.5, and Me is at least one metal element excluding Li and Ni), and a carbon nanotube.

Abstract: This non-aqueous electrolyte secondary battery, which is one example of an embodiment, comprises: a positive electrode that has a positive electrode mixture layer; a negative electrode; and a non-aqueous electrolyte. The positive electrode mixture layer contains a first lithium-and-transition-metal composite oxide represented by general formula LixNi1-y-zCoyMzO2 (in the formula, 0.8?x?1.2, 0?y?0.2, 0<z?0.5, and M is at least one metal element excluding Li, Ni, and Co), and a second lithium-and-transition-metal composite oxide represented by general formula LiaNi2-a-bMebO2 (in the formula, 0<a?0.5, 0?b?0.5, and Me is at least one metal element excluding Li and Ni). The non-aqueous electrolyte contains a sulfonyl imide salt.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery according to one exemplary embodiment comprises: a first lithium transition metal composite oxide represented by general formula LiaNibM11-bO2 (in the formula, 1.5?a?2.5, 0.95?b?1.00, and M1 is at least one metal element excluding Li and Ni); and a second lithium transition metal composite oxide represented by general formula LicNi2-c-dM2dO2 (in the formula, 0<c?0.5, 0?d?0.5, and M2 is at least one metal element excluding Li and Ni).

Abstract: A positive electrode active material according to the present invention contains first and second lithium-transition metal complex oxides at respective predetermined proportions. The first lithium-transition metal complex oxide includes a core containing at least Li, Ni, and M1 (M1 is at least one element selected from the group consisting of Mn, W, Mg, Mo, Nb, Ti, Si, and Al), and a surface modification layer that is present at least on the surface of the core. The surface modification layer includes M2 (M2 is at least one element selected from the group consisting of Sr, Ca, W, Mg, Nb, and Al). The second lithium-transition metal complex oxide includes at least a compound represented by general formula LiaNibM31-bO2 (in the formula. 1.5?a?2.5 and 0.95?b?1 are satisfied, and M3 is at least one element selected from the group consisting of Cu, Sr, Ca, Nb, Si, and Al).

Abstract: An object of the invention is to provide a positive electrode active material for nonaqueous electrolyte secondary batteries that prevents low capacity recovery after high-temperature storage. A nonaqueous electrolyte secondary battery according to the present invention includes secondary particles of a lithium transition metal oxide resulting from the aggregation of primary particles of the oxide, secondary particles of a rare earth compound resulting from the aggregation of primary particles of the compound, and a magnesium compound. The secondary particles of the rare earth compound are adhering to depressions formed between adjacent primary particles of the lithium transition metal oxide on the surface of the secondary particles of the lithium transition metal oxide and also to each of the primary particles forming the depressions. The magnesium compound is adhering to the surface of the secondary particles of the lithium transition metal oxide.

Abstract: An object of the present invention is to provide a nonaqueous electrolyte secondary battery that can attain a smaller increase in direct current resistance after charge discharge cycles. An aspect of the invention resides in a nonaqueous electrolyte secondary battery wherein a positive electrode active material includes a secondary particle formed by aggregation of primary particles of a lithium transition metal oxide, and a secondary particle formed by aggregation of primary particles of a rare earth compound. On a surface of the secondary particle of the lithium transition metal oxide, the secondary particle of the rare earth compound is attached to a recess formed between adjacent primary particles of the lithium transition metal oxide in such a manner that the secondary particle of the rare earth compound is attached to each of the primary particles forming the recess. The lithium transition metal oxide includes magnesium dissolved therein.

Abstract: An object of the present invention is to provide a nonaqueous electrolyte secondary battery that can attain a smaller increase in direct current resistance after charge discharge cycles. An aspect of the invention resides in a nonaqueous electrolyte secondary battery wherein a positive electrode active material includes a secondary particle formed by aggregation of primary particles of a lithium transition metal oxide, and a secondary particle formed by aggregation of primary particles of a rare earth compound. On a surface of the secondary particle of the lithium transition metal oxide, the secondary particle of the rare earth compound is attached to a recess formed between adjacent primary particles of the lithium transition metal oxide in such a manner that the secondary particle of the rare earth compound is attached to each of the primary particles forming the recess. The lithium transition metal oxide includes magnesium dissolved therein.

Abstract: A positive electrode active material for a non-aqueous-electrolyte secondary battery contains a nickel-containing lithium transition metal oxide and is a primary particle alone of a lithium transition metal oxide that contains nickel in an amount of 80 mol % or more relative to the whole molar quantity of a metal element other than lithium or a secondary particle formed by aggregation of two to five particles. A rare earth compound and a magnesium compound adhere to the surface of the primary particle alone or the secondary particle.

Abstract: There is provided a positive electrode active material for a nonaqueous electrolyte secondary battery capable of suppressing a decrease in the capacity retention ratio after high-temperature cycles. There is provided a positive electrode active material for a nonaqueous electrolyte secondary battery that includes a secondary particle formed by aggregation of primary particles formed of a lithium transition metal oxide. A rare-earth compound secondary particle formed by aggregation of particles formed of a rare-earth compound adheres to a recess formed between primary particles adjacent to each other on a surface of the secondary particle, and the rare-earth compound secondary particle adheres to both the primary particles adjacent to each other in the recess. The lithium transition metal oxide contains tungsten dissolved therein.

Abstract: A positive electrode active material for nonaqueous electrolyte secondary batteries is provided with which increased DCR after cycling can be controlled. A positive electrode active material according to an aspect of the present invention is secondary particles of a lithium transition metal oxide formed through the aggregation of primary particles of the oxide, the lithium transition metal oxide containing at least Ni. Secondary particles of a rare earth compound formed through the aggregation of particles of the rare earth compound are adhering to depressions each created between adjacent two of the primary particles on the surfaces of the secondary particles. The secondary particles of the rare earth compound are adhering to both of the two adjacent primary particles at the depressions.

Abstract: There is provided a positive electrode active material for a nonaqueous electrolyte secondary battery capable of suppressing an increase in DCR during cycles. There is provided a positive electrode active material for a nonaqueous electrolyte secondary battery that includes a secondary particle formed by aggregation of primary particles formed of a lithium transition metal oxide. A rare-earth compound secondary particle formed by aggregation of particles formed of a rare-earth compound adheres to a recess formed between primary particles adjacent to each other on a surface of the secondary particle, and the rare-earth compound secondary particle adheres to both the primary particles adjacent to each other in the recess. A tungsten-containing compound adheres to an interface of primary particles inside the secondary particle formed of the lithium transition metal oxide.

Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery which includes a secondary particle of a lithium transition metal oxide, the secondary particle being formed by coagulation of primary particles of the lithium transition metal oxide; secondary particles of a rare earth compound, the secondary particles each being formed by coagulation of primary particles of the rare earth compound; and particles of an alkali-metal fluoride. The secondary particles of the rare earth compound are each deposited on a groove between a pair of adjacent primary particles which is formed in a surface of the secondary particle of the lithium transition metal oxide so as to come into contact with both of the pair of adjacent primary particles in the groove. The particles of the alkali-metal fluoride are deposited on the surface of the secondary particle of the lithium transition metal oxide.

Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery which includes a secondary particle of a lithium transition metal oxide, the secondary particle being formed by coagulation of primary particles of the lithium transition metal oxide; secondary particles of a rare earth compound, the secondary particles each being formed by coagulation of primary particles of the rare earth compound; and particles of an alkali-metal fluoride. The secondary particles of the rare earth compound are each deposited on a groove between a pair of adjacent primary particles which is formed in a surface of the secondary particle of the lithium transition metal oxide so as to come into contact with both of the pair of adjacent primary particles in the groove. The particles of the alkali-metal fluoride are deposited on the surface of the secondary particle of the lithium transition metal oxide.

Abstract: Provided is a nonaqueous electrolyte secondary battery capable of limiting an increase in DCR which occurs after the battery has been subjected to cycles of charging and discharging. A nonaqueous electrolyte secondary battery according to an exemplary embodiment includes a positive electrode including a positive electrode active material. The positive electrode active material includes a secondary particle of a lithium transition metal oxide which is formed by coagulation of primary particles of the lithium transition metal oxide and secondary particles of a rare earth compound which are each formed by coagulation of primary particles of the rare earth compound.

Abstract: There is provided a positive electrode active material for a nonaqueous electrolyte secondary battery capable of suppressing a decrease in the capacity retention ratio after high-temperature cycles. There is provided a positive electrode active material for a nonaqueous electrolyte secondary battery that includes a secondary particle formed by aggregation of primary particles formed of a lithium transition metal oxide. A rare-earth compound secondary particle formed by aggregation of particles formed of a rare-earth compound adheres to a recess formed between primary particles adjacent to each other on a surface of the secondary particle, and the rare-earth compound secondary particle adheres to both the primary particles adjacent to each other in the recess. The lithium transition metal oxide contains tungsten dissolved therein.

Abstract: There is provided a positive electrode active material for a nonaqueous electrolyte secondary battery capable of suppressing an increase in DCR during cycles. There is provided a positive electrode active material for a nonaqueous electrolyte secondary battery that includes a secondary particle formed by aggregation of primary particles formed of a lithium transition metal oxide. A rare-earth compound secondary particle formed by aggregation of particles formed of a rare-earth compound adheres to a recess formed between primary particles adjacent to each other on a surface of the secondary particle, and the rare-earth compound secondary particle adheres to both the primary particles adjacent to each other in the recess. A tungsten-containing compound adheres to an interface of primary particles inside the secondary particle formed of the lithium transition metal oxide.

Abstract: A positive electrode active material for nonaqueous electrolyte secondary batteries is provided with which increased DCR after cycling can be controlled. A positive electrode active material according to an aspect of the present invention is secondary particles of a lithium transition metal oxide formed through the aggregation of primary particles of the oxide, the lithium transition metal oxide containing at least Ni. Secondary particles of a rare earth compound formed through the aggregation of particles of the rare earth compound are adhering to depressions each created between adjacent two of the primary particles on the surfaces of the secondary particles. The secondary particles of the rare earth compound are adhering to both of the two adjacent primary particles at the depressions.

Abstract: It is an object of the present invention to provide a positive electrode for nonaqueous electrolyte secondary batteries that can suppress decreases in the discharge capacity and discharge voltage even when continuous charging is performed at high temperature and that can also suppress decreases in the discharge voltage and energy density even in the charge and discharge after the continuous charging, and to provide a nonaqueous electrolyte secondary battery that uses the positive electrode. The positive electrode includes a positive electrode active material composed of a mixture containing lithium cobalt oxide 21 having a surface to which an erbium compound 22 is partly adhered and lithium nickel cobalt manganese oxide and a binder. The content of the lithium nickel cobalt manganese oxide is 1% by mass or more and 50% by mass or less relative to the total amount of the positive electrode active material.