Abstract: A high-capacity non-aqueous electrolyte secondary battery capable of maintaining good cycle characteristics even in the case where large current discharge is repeated is provided. A positive electrode active material particle (32) includes a base particle (33) produced by agglomeration of primary particles (33a) made from lithium transition metal oxide containing tungsten and a rare earth compound particles (34) attached to the surface of the base particle (33). Preferably, the rare earth compound is attached to the interface at which the primary particles are in contact with each other or the vicinity of the interface.

Abstract: In a nonaqueous electrolyte secondary battery including a positive electrode containing a positive electrode active material, a negative electrode, and a nonaqueous electrolyte, the positive electrode active material contains a lithium transition metal oxide having a surface to which a rare earth compound is adhered, and the nonaqueous electrolyte contains a lithium salt in which an oxalate complex functions as an anion.

Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery includes a lithium transition metal oxide containing nickel and zirconium and including secondary particles, each of which is composed of an aggregate of primary particles, and a rare earth compound deposited on and/or near interfaces between the primary particles.

Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present invention includes a positive electrode (1) containing a positive electrode active material that contains a lithium transition metal oxide having a surface to which a compound of a rare-earth element is adhered, a negative electrode (2) containing a negative electrode active material, and a nonaqueous electrolyte to which a lithium salt having a P—O bond and a P—F bond in its molecule and/or a lithium salt having a B—O bond and a B—F bond in its molecule is added.

Abstract: There is provided a positive electrode for a nonaqueous electrolyte secondary battery, the positive electrode being capable of improving the charge-discharge cycle characteristics of the nonaqueous electrolyte secondary battery. A positive electrode 12 of a nonaqueous electrolyte secondary battery 1 contains positive electrode active material particles. The positive electrode active material particles contain a lithium-containing transition metal oxide. The lithium-containing transition metal oxide has a crystal structure that belongs to the space group P63mc. A compound of at least one selected from the group consisting of boron, zirconium, aluminum, magnesium, titanium, and a rare-earth element is attached to surfaces of the positive electrode active material particles.

Abstract: An object is to provide a positive electrode for a non-aqueous electrolyte secondary battery and a non-aqueous electrolyte secondary battery that allow a high output characteristic. Included are a positive electrode collector and a positive electrode mixture layer formed on at least one surface of the positive electrode collector. The positive electrode mixture layer contains particles 3 of lithium nickel cobalt manganese oxide represented by LiNi0.55Co0.20Mn0.25O2, erbium oxyhydroxide 1 fixed on the surfaces of the particles of the lithium nickel cobalt manganese oxide 3, tungsten trioxide 2 adhering to the surfaces of the particles of the lithium nickel cobalt manganese oxide 3, and a binder.

Abstract: The object is to provide a nonaqueous electrolyte secondary battery which can improve performance (increase in capacity) and reduce cost by improvement in heat stability. There are provided a positive electrode including a metal halide and a positive electrode active material containing a lithium transition metal oxide which includes nickel and manganese, a negative electrode including a negative electrode active material, and a nonaqueous electrolyte including a nonaqueous solvent, a fluorine-containing lithium salt, and a lithium salt which includes an oxalate complex as an anion.

Abstract: The present invention provides a nonaqueous electrolyte battery having a high charge-discharge efficiency. The nonaqueous electrolyte battery of the present invention is a nonaqueous electrolyte battery including a positive electrode containing a positive electrode active material, a negative electrode, and a nonaqueous electrolyte, the positive electrode active material contains a lithium transition metal oxide having a crystalline structure belonging to the P63mc space group, and the nonaqueous electrolyte contains a fluorinated cyclic carbonate ester and a fluorinated chain ester.

Abstract: A positive electrode active material having a lithium-excess lithium-transition metal composite oxide particle represented by the chemical formula Li1.2Mn0.54Ni0.13Co0.13O2. The lithium-excess lithium-transition metal composite oxide particle has an inner portion (1) having a layered structure and a surface adjacent portion (2) having a crystal structure gradually changing from a layered structure to a spinel structure from the inner portion (1) toward the outermost surface portion (3). The layered structure and the spinel structure have an identical ratio of the amount of Mn and the total amount of Ni and Co.

Abstract: A lithium ion secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte. The positive electrode active material is a lithium transition metal oxide that contains niobium and is represented by xLi[Li1/3Mn2/3-qNbq]O2·(1?x)LiM1-rNbrO2 (0<x<1, 0<xq+(1?x)r?0.3, 0?q?0.3, 0?r?0.3, and M: at least one element selected from the group consisting of nickel, cobalt, and manganese). During initial charging, oxygen desorbs from the positive electrode active material.

Abstract: A non-aqueous electrolyte battery has a working electrode 1 having a positive electrode active material, a counter electrode 2, and a non-aqueous electrolyte containing lithium. The positive electrode active material includes a lithium pre-doped transition metal oxide prepared by pre-doping lithium into a sodium-containing transition metal oxide having an initial charge-discharge efficiency of higher than 100% as determined by charging and discharging using a lithium metal negative electrode as a counter electrode, and the sodium-containing transition metal oxide is represented by the compositional formula NaaLibMO2±?, where 0.5?a<1.0, 0<b?0.5, 0?a?0.1, and M is at least one element selected from the group consisting of Ni, Co, and Mn.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte solution containing a nonaqueous solvent. The positive electrode active material contains a lithium-containing transition metal oxide represented by general formula (1), Li1+xMnyMzO2 (where x, y, and z satisfy 0<x<0.4, 0<y<1, 0<z<1, and x+y+z=1; and M represents at least one metal element and contains at least one of Ni and Co). The nonaqueous solvent contains a fluorinated cyclic carbonate having two or more fluorine atoms directly bonded to a carbonate ring.

Abstract: The nonaqueous electrolyte secondary battery includes: a positive electrode containing a positive-electrode active material; a negative electrode; and a nonaqueous electrolyte. The positive-electrode active material contains a lithium-containing oxide obtained by ion-exchanging part of sodium in a cobalt-containing oxide containing lithium, sodium, and titanium with lithium.

Abstract: A method of detecting a condition of a secondary battery is provided. The method includes the steps of: measuring an entropy change at a predetermined state of charge of the secondary battery; charging the secondary battery after the step of measuring an entropy change; repeating the steps of measuring an entropy change and charging the secondary battery; and detecting a deterioration condition of the secondary battery based on the slope of a measured entropy change curve with respect to state of charge.

Abstract: A method for evaluating a secondary battery includes repeatedly performing: an open circuit voltage measurement step of measuring the open circuit voltage of the secondary battery to be evaluated at each of a plurality of temperatures; a potential change measurement step of measuring, after the open circuit voltage measurement step, the potential change in the secondary battery while changing the state of charge of the secondary battery; and an equilibrium potential measurement step of measuring the equilibrium potential of the secondary battery after the potential change measurement step. An entropy variation in each of the different states of charge is calculated based on the open circuit voltages at the plurality of temperatures measured in the state of charge, and a chemical diffusion coefficient in each of the different states of charge is calculated based on the equilibrium potential of the secondary battery and the potential change in the secondary battery both measured in the state of charge.

Abstract: A positive electrode active material having a lithium-excess lithium-transition metal composite oxide particle represented by the chemical formula Li1.2Mn0.54Ni0.13Co0.13O2. The lithium-excess lithium-transition metal composite oxide particle has an inner portion (1) having a layered structure and a surface adjacent portion (2) having a crystal structure gradually changing from a layered structure to a spinel structure from the inner portion (1) toward the outermost surface portion (3). The layered structure and the spinel structure have an identical ratio of the amount of Mn and the total amount of Ni and Co.

Abstract: A lithium ion secondary battery including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte. The positive electrode active material is a lithium transition metal oxide that contains niobium and is represented by xLi[Li1/3Mn2/3-qNbq]O2·(1?x)LiM1-rNbrO2 (0<x<1, 0<xq+(1?x)r?0.3, 0?q?0.3, 0?r?0.3, and M: at least one element selected from the group consisting of nickel, cobalt, and manganese). During initial charging, oxygen desorbs from the positive electrode active material.

Abstract: A non-aqueous electrolyte battery has a working electrode 1 having a positive electrode active material, a counter electrode 2, and a non-aqueous electrolyte containing lithium. The positive electrode active material includes a lithium pre-doped transition metal oxide prepared by pre-doping lithium into a sodium-containing transition metal oxide having an initial charge-discharge efficiency of higher than 100% as determined by charging and discharging using a lithium metal negative electrode as a counter electrode, and the sodium-containing transition metal oxide is represented by the compositional formula NaaLibMO2±?, where 0.5?a<1.0, 0<b?0.5, 0???0.1, and M is at least one element selected from the group consisting of Ni, Co, and Mn.

Abstract: A non-aqueous electrolyte secondary battery has a positive electrode containing a positive electrode active material, a negative electrode, and a non-aqueous electrolyte solution in which an electrolyte is dissolved in a non-aqueous solvent. The positive electrode active material includes a lithium-containing transition metal oxide that releases oxygen during initial charge, and the non-aqueous solvent contains a fluorinated cyclic carbonate in which fluorine atoms are directly bonded to a carbonate ring.

Abstract: A positive electrode active material includes a layered lithium-manganese oxide represented by the general formula Li2-xMn1-yO3-p, where 0?x?2/3, 0?y?1/3, and 0?p?1, the lithium-manganese oxide having a full width half maximum of a peak of the (001) crystal plane, as determined by an X-ray diffraction analysis, of 0.22° or greater, and an average particle size of 130 nm or less.