Abstract: Provided is a multilayered porous membrane that comprises a porous membrane containing polyolefin resin as the main component thereof, and that comprises a porous layer layered on at least one surface of the porous membrane and containing inorganic particles and a binder polymer. The total thickness of the porous layer is 0.5-3.0 ?m; the number of pores in the porous layer having an area for the individual pore of at least 0.001 ?m2 is 65-180 per 10 ?m2 of the field of observation; of the pores in the porous layer that have an area of at least 0.001 ?m2, the proportion therein of pores in the range from 0.001 ?m2 to 0.05 ?m2 is at least 90%; the proportion taken up by the inorganic particles in the porous layer is from 90-99 mass %; and the aspect ratio of the inorganic particles is from 1.0-3.0.

Abstract: Provided is a nonaqueous lithium power storage element that can suppress excessive decomposition of a lithium compound remaining in a positive electrode, can suppress gas generation at high voltages, and can suppress capacity declines during high-load charge/discharge cycling. The nonaqueous lithium power storage element according to the present embodiment has a positive electrode that contains a lithium compound other than an active material, a negative electrode, a separator, and a lithium ion-containing nonaqueous electrolyte, wherein in the elemental map provided by SEM-EDX of the surface of the positive electrode, the area overlap ratio U1 of the fluorine map relative to the oxygen map, as provided by binarization based on the average value of the brightness values, is 40% to 99%.

Abstract: This nonaqueous lithium power storage element contains a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte that contains lithium ions. The positive electrode has a positive electrode current collector and a positive electrode active material layer disposed on one surface or both surfaces of the positive electrode current collector, and the positive electrode active material layer contains a positive electrode active material that contains a carbon material. When the pore distribution of the positive electrode active material layer is measured by mercury intrusion, the pore distribution curve for the relationship between the pore diameter and log differential pore volume has at least one peak having a peak value of 1.0-5.0 mL/g for the log differential pore volume in the pore diameter range of 0.1-50 ?m, and the total cumulative pore volume Vp in the pore diameter range of 0.1-50 ?m is 0.7-3.0 mL/g.

Abstract: The disclosure relates to a nonaqueous lithium power storage element containing a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte that contains lithium ions.

Abstract: Provided is a nonaqueous lithium power storage element that can suppress excessive decomposition of a lithium compound remaining in a positive electrode, can suppress gas generation at high voltages, and can suppress capacity declines during high-load charge/discharge cycling. The nonaqueous lithium power storage element according to the present embodiment has a positive electrode that contains a lithium compound other than an active material, a negative electrode, a separator, and a lithium ion-containing nonaqueous electrolyte, wherein in the elemental map provided by SEM-EDX of the surface of the positive electrode, the area overlap ratio U1 of the fluorine map relative to the oxygen map, as provided by binarization based on the average value of the brightness values, is 40% to 99%.