Abstract: The present invention provides: a catalyst which has high activity and enables the production of an olefin polymer that has a polar group; and a method for producing the polymer. A catalyst for olefin polymerization, which contains a metal complex represented by general formula (C1); and a method for producing an ethylene (co)polymer, wherein (1) ethylene is polymerized, (2) ethylene and an olefin having a polar group represented by general formula (1) are copolymerized, or (3) ethylene, an olefin having a polar group represented by general formula (1) and another monomer are copolymerized, with use of the above-described catalyst. (In the formulae, the symbols are as defined in the description; and at least one of R6 and R7 represents a 9-fluorenyl analogous group represented by general formula (2).

Abstract: A positive electrode for an energy storage device according to one aspect of the present invention includes a positive active material layer containing a positive active material and a carbon nanotube, in which in a Log differential pore volume distribution of the positive active material layer measured by a mercury intrusion method, an average value of a ratio of a Log differential pore volume to a pore diameter in a range of a pore diameter of 20 nm or more and 200 nm or less is 3000 cm2/g or more.

Abstract: A positive electrode according to one aspect of the present invention is a positive electrode for a nonaqueous electrolyte energy storage device, including a positive composite having a density of 3.1 g/cm3 or more, in which the positive composite contains a positive active material containing nickel and a reducing organic acid. The nonaqueous electrolyte energy storage device according to one aspect of the present invention is a nonaqueous electrolyte energy storage device including the positive electrode.

Abstract: A purpose of the present invention is to provide a technique for still further improving safety by increasing the resistance change ratio in a high-temperature range in a nonaqueous electrolyte energy storage device, the internal resistance of which increases with an increase in internal temperature. In a positive electrode plate for nonaqueous electrolyte energy storage device, an intermediate layer containing an electrically conducting agent and a binder is provided between a positive electrode current collector and a positive composite layer, and as the binder in the intermediate layer, one having a mass average molecular weight larger than that of a binder in the positive composite layer is used. Consequently, the resistance change ratio in a high-temperature range can be increased.

Abstract: In order to improve the insulating property of a covering layer containing a filler disposed on at least a part of a surface of a negative composite layer, there is provided a negative electrode for a nonaqueous electrolyte energy storage device, including a negative electrode including a current collector, a negative composite layer containing a negative active material, and a covering layer containing a filler on at least a part of a surface of the negative composite layer, wherein in X-ray diffraction (XRD) measurement of the negative electrode, a peak intensity ratio (I(002)/I(100)) between a diffraction peak attributed to (002) plane of the negative active material and a diffraction peak attributed to (100) plane of the negative active material is 219 or more and 862 or less.