Abstract: Provided is an electrochemical device which is capable of suppressing problems affecting the capacitor element as a whole, such as a drop in its voltage resistance characteristics and shortening of its life. The capacitor element (10) is constituted of a laminate formed by superposition of a first electrode sheet (11), a separation sheet (14), a second electrode sheet (12), a separation sheet (14), and a third electrode sheet (13) in the named order from the bottom, and folding the laminate along a reference line VSL to double the laminate. In the resulting folded laminate, a collector electrode layer (11a) and polarizable electrode layer (11b) of the first electrode sheet (11), the collector electrode layer (12a) and polarizable electrode layer (12b) of the second electrode sheet (12), the collector electrode (13a) and polarizable electrode layer (13b) of the third electrode sheet (13), and the two separation sheets (14) are connected to each other at the respective folded locations.

Abstract: Provided is an electrochemical device which is capable of suppressing problems affecting the capacitor element as a whole, such as a drop in its voltage resistance characteristics and shortening of its life. The capacitor element (10) is constituted of a laminate formed by superposition of a first electrode sheet (11), a separation sheet (14), a second electrode sheet (12), a separation sheet (14), and a third electrode sheet (13) in the named order from the bottom, and folding the laminate along a reference line VSL to double the laminate. In the resulting folded laminate, a collector electrode layer (11a) and polarizable electrode layer (11b) of the first electrode sheet (11), the collector electrode layer (12a) and polarizable electrode layer (12b) of the second electrode sheet (12), the collector electrode (13a) and polarizable electrode layer (13b) of the third electrode sheet (13), and the two separation sheets (14) are connected to each other at the respective folded locations.

Abstract: An organic electrolyte capacitor is provided with a high energy density, a high power and a high capacitance even at ?20°. The organic electrolyte capacitor has a high discharge capacity even at a temperature as low as ?20° C., while having a high voltage and a high energy density. The structure of the organic electrolyte capacitor includes a positive electrode, a negative electrode, and an electrolyte capable of transporting lithium ions. The positive electrode can reversibly support lithium ions and anions, and the negative electrode can reversibly support the lithium ions by using a mesopored carbon material having a pore volume of 0.10 ml/g or more for a pore diameter of 3 nm or larger.

Abstract: An organic electrolyte capacitor having a high energy density and a high power and having a high capacitance even at ?20° C. is provided. According to the organic electrolyte capacitor of the present invention, an organic electrolyte capacitor having a high discharge capacity even at a low temperature state as low as ?20° C. while having a high voltage and a high energy density can be attained in an organic electrolyte capacitor having a positive electrode, a negative electrode, and an electrolyte capable of transporting lithium ions, in which the positive electrode can reversibly support lithium ions and anions, and the negative electrode can reversibly support the lithium ions by using a mesopored carbon material having a pore volume of 0.10 ml/g or more for pore diameter of 3 nm or larger.

Abstract: A method of producing an electrode for non-aqueous electrolytic cells comprising forming on a collector an electrode active substance layer comprising an active substance composed of polymer carbon, a conductive agent composed of graphite showing a flake form, and a binder, characterized in that when the specific surface area of the active substance as measured by the BET method is denoted by Sa, the compounded weight thereof at the time of kneading by Wa, the specific surface area of the graphite as measured by the BET method by Sg, and the compounded weight thereof at the time of kneading by Wg, the mixture is kneaded by a kneading device under conditions satisfying the following equation: Wa/wg≧2 0.5·Sg/Sa, thereby making it possible to obtain an electrode for non-aqueous electrolytic cells improved in charge and discharge characteristics such as discharge potential, discharge capacity and charge and discharge cycle life.