Abstract: To provide a photocatalyst decomposition apparatus that can supply a liquid phase containing a substance to be decomposed by a photocatalyst and that can perform decomposition of the substance more efficiently than in the related art. A photocatalyst decomposition system according to the invention includes: a gas phase generation apparatus configured to convert a liquid phase containing a decomposition object into a gas phase; and a photocatalyst member configured to come into contact with the gas phase to decompose the decomposition object by light from a light source. The photocatalyst member includes a base material formed of a porous material and a photocatalyst layer provided on a surface of the base material.

Abstract: A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li1+aNibMncCodTieMfO2+?, and has an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and a are numbers satisfying ?0.1?a?0.2, 0.7<b?0.9, 0?c<0.3, 0?d<0.3, 0<e?0.25, 0?f<0.3, b+c+d+e+f=1, and ?0.2???0.2.

Abstract: A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li1+aNibMncCodTieMfO2+?, and has an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and a are numbers satisfying ?0.1?a?0.2, 0.7<b?0.9, 0?c<0.3, 0?d<0.3, 0<e?0.25, 0?f<0.3, b+c+d+e+f=1, and ?0.2???0.2.

Abstract: A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li1+aNibMncCodTieMfO2+?, and has an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and ? are numbers satisfying ?0.1?a?0.2, 0.7<b?0.9, 0?c<0.3, 0?d<0.3, 0<e?0.25, 0?f<0.3, b+c+d+e+f=1, and ?0.2???0.2.

Abstract: A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li1+aNibMncCodTieMfO2+?, and has an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and ? are numbers satisfying ?0.1?a?0.2, 0.7<b?0.9, 0?c<0.3, 0?d<0.3, 0<e?0.25, 0?f<0.3, b+c+d+e+f=1, and ?0.2???0.2.

Abstract: A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li1+aNibMncCodTieMfO2+?, and has an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and ? are numbers satisfying ?0.1?a?0.2, 0.7<b?0.9, 0?c<0.3, 0?d<0.3, 0<e?0.25, 0?f<0.3, b+c+d+e+f=1, and ?0.2???0.2.

Abstract: Provided are a non-aqueous electrolyte solution used for a lithium secondary battery etc. capable of decreasing aging deterioration of a discharge capacity, a cathode used for a lithium secondary battery, and a method for producing the same, as well as a storage device like a lithium secondary battery etc. To the non-aqueous electrolyte solution, added are POF2? or a salt thereof, and, PO2F2? or a salt thereof or PO3F2? or a salt thereof. Alternatively, added is a reaction product between a boroxine compound and lithium hexafluorophosphate. In the cathode, the average oxidation number of a transition metal present in a surface layer of a composite oxide is more than 4 in Mn, more than 3 in Co and more than 2 in Ni, respectively. Further, a boron-containing compound is present on a surface of the composite oxide.

Abstract: A positive-electrode material for a lithium ion secondary battery contains a lithium complex compound that is represented by the formula: Li1+aNibMncCodTieMfO2+?, and has an atomic ratio Ti3+/Ti4+ between Ti3+ and Ti4+, as determined through X-ray photoelectron spectroscopy, of greater than or equal to 1.5 and less than or equal to 20. In the formula, M is at least one element selected from the group consisting of Mg, Al, Zr, Mo, and Nb, and a, b, c, d, e, f, and ? are numbers satisfying ?0.1?a?0.2, 0.7<b?0.9, 0?c<0.3, 0?d<0.3, 0<e?0.25, 0?f<0.3, b+c+d+e+f=1, and ?0.2???0.2.

Abstract: Conventionally, there is a problem that a volume of a negative electrode active material changes during a charge-discharge cycle, a conductive network in a negative electrode gradually degrades, and thus a capacity of the negative electrode decreases. To solve the problem, the present invention has an object to prevent a reduction in capacity of the negative electrode, and increase life of a lithium ion secondary battery. A negative electrode active material for lithium ion secondary battery includes: a graphite core material; and a covering layer that covers a surface of the core material, wherein the covering layer has a thickness of 1 nm to 200 nm, and has a bulk modulus lower than a bulk modulus of the core material.