A non-aqueous lithium power storage element that includes a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, the positive electrode having a positive electrode collector and a positive electrode active material layer that includes active carbon, and the non-aqueous lithium power storage element having configuration (1) and/or (2). (1) The negative electrode includes a negative electrode collector and a negative electrode active material layer (2) The non-aqueous electrolyte contains (A) LiPF.sub.6 and/or LiBF.sub.4, (B) an imide lithium salt, and (C) an oxalate-complex lithium salt, the ratio of the mass of component (C) to the total mass of components (A) and (B) being 1.0-10.0 mass %.

The present invention relates to a method for preparing a lithium manganese oxide-based material useful in applications such as for pseudocapacitors and lithium ions batteries. More specifically, by synthesizing manganese oxide nanoparticles and mixing them with lithium salts, and conducting stepwise heat treatment processes under optimized conditions, a lithium manganese oxide-based material with excellent specific capacitance, having a high surface area with a small size, can be prepared.

The present invention relates to a method for preparing a lithium manganese oxide-based material useful in applications such as for pseudocapacitors and lithium ions batteries. More specifically, by synthesizing manganese oxide nanoparticles and mixing them with lithium salts, and conducting stepwise heat treatment processes under optimized conditions, a lithium manganese oxide-based material with excellent specific capacitance, having a high surface area with a small size, can be prepared.

A solid electrolyte capacitor includes a sintered body formed by sintering a molded body containing a metal powder; and a solid electrolyte layer disposed on the sintered body, wherein the solid electrolyte layer includes a first layer containing an electrolytic polymerization conductive polymer disposed on the sintered body and a second layer containing a chemical polymerization conductive polymer disposed on the first layer.

A solid electrolyte capacitor includes a sintered body formed by sintering a molded body containing a metal powder; and a solid electrolyte layer disposed on the sintered body, wherein the solid electrolyte layer includes a first layer containing an electrolytic polymerization conductive polymer disposed on the sintered body and a second layer containing a chemical polymerization conductive polymer disposed on the first layer.

A solid electrolyte capacitor includes a sintered body formed by sintering a molded body containing metal powder; and a conductive polymer layer disposed above the sintered body. A ratio (t2/t1) of a thickness (t2) of the conductive polymer layer in an edge portion of the sintered body to a thickness (t1) of the conductive polymer layer in a central portion of the sintered body satisfies 0.35≤t2/t1≤0.9.

A solid electrolyte capacitor includes a sintered body formed by sintering a molded body containing metal powder; and a conductive polymer layer disposed above the sintered body. A ratio (t2/t1) of a thickness (t2) of the conductive polymer layer in an edge portion of the sintered body to a thickness (t1) of the conductive polymer layer in a central portion of the sintered body satisfies 0.35≤t2/t1≤0.9.

An energy storage device includes a negative electrode having a negative active material layer containing amorphous carbon as an active material, a curve attained by determining a rate of change (dQ/dV) in a potential (V) of the amorphous carbon in a discharge capacity (Q) of the amorphous carbon per unit quantity based on a result attained by measuring the potential (V) with respect to the discharge capacity (Q) and representing the rate of change (dQ/dV) with respect to the potential (V) has one or more peaks in a range in which the potential of the amorphous carbon is 0.8 V or more and 1.5 V or less, and a potential of the negative electrode at time of full charge is 0.25 V or more with respect to a lithium potential.

A lamellar transition metal sulfide composition having layers of an amorphous transition metal sulfide with cations interspersed between the layers is described. Also described are methods of synthesizing the lamellar transition metal sulfides and the use of the lamellar transition metal sulfides in electrodes, e.g., in metal-ion batteries, metal-ion/sulfur batteries, and capacitors.

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a lithium-nickel composite oxide of a layered rock-salt type.