Abstract: Provided are plastic crystal-type solid electrolyte having high ion conductivity and a power storage device using the solid electrolyte. The solid electrolyte contains a plastic crystal doped with an electrolyte. The plastic crystal contains two or more types of cations in total, at least one of which is selected from the group of imidazoliums and quaternary ammoniums.

Abstract: Provided is a conductive carbon mixture which is to be used together with an electrode active material in manufacturing an electrode of an electricity storage device and enables the manufacture of the electricity storage device having a good cycle life. The conductive carbon mixture for manufacturing an electrode of an electricity storage device comprises an oxidized carbon having electrical conductivity and a different conductive carbon which is different from the oxidized carbon, wherein the oxidized carbon covers the surface of the different conductive carbon. The conductive carbon mixture is characterized in that the ratio of the peak intensity of the 2D band to the peak intensity of the D band in a Raman spectrum of the conductive carbon mixture is 55% or less relative to the ratio of the peak intensity of the 2D band to the peak intensity of the D band in a Raman spectrum of the different conductive carbon.

Abstract: A plastic-crystal-based solid electrolyte with high ion conductivity and a power storage device using said solid electrolyte are provided. The plastic crystal includes two different types of anions selected from a group of various amide anions in which two hydrogen atoms of NH2 anion are substituted with perfluoroalkylsulfonyl group, fluorosulfonyl group, or both, and tris(trifluoromethanesulfonyl)metanide anion, or the plastic crystal includes anions selected one each from the first group, and a second group of hexafluorophosphate anion, various perfluoroalkylphosphate anions in which a part of fluorine atoms of PF6 is substituted with fluoroalkyl group, and various perfluoroalkylborate anions in which a part of fluorine atoms of BF4 anion is substituted with fluoroalkyl group.

Abstract: Provided is a conductive carbon mixture which is to be used together with an electrode active material in manufacturing an electrode of an electricity storage device and enables the manufacture of the electricity storage device having a good cycle life. The conductive carbon mixture for manufacturing an electrode of an electricity storage device comprises an oxidized carbon having electrical conductivity and a different conductive carbon which is different from the oxidized carbon, wherein the oxidized carbon covers the surface of the different conductive carbon. The conductive carbon mixture is characterized in that the ratio of the peak intensity of the 2D band to the peak intensity of the D band in a Raman spectrum of the conductive carbon mixture is 55% or less relative to the ratio of the peak intensity of the 2D band to the peak intensity of the D band in a Raman spectrum of the different conductive carbon.