Abstract: This electric double layer capacitor is an electric double layer capacitor capable of maintaining a discharge capacity retention rate of 80% or more in a constant current and constant voltage continuous charge test at 60° C. and 3.5 V for 1,000 hours or more, wherein a positive electrode includes graphite as a positive-electrode active material, a current collector on the positive electrode side is an aluminum material, the aluminum material is coated with an amorphous carbon film, and the amorphous carbon film has a thickness in the range from 60 nm or more to 300 nm or less.

Abstract: This electric double layer capacitor is an electric double layer capacitor capable of maintaining a discharge capacity retention rate of 80% or more in a constant current and constant voltage continuous charge test at 60° C. and 3.5 V for 1,000 hours or more, wherein a positive electrode includes graphite as a positive-electrode active material, a current collector on the positive electrode side is an aluminum material, the aluminum material is coated with an amorphous carbon film, and the amorphous carbon film has a thickness in the range from 60 nm or more to 300 nm or less.

Abstract: A non-aqueous electrolyte storage element, which contains a positive electrode; a negative electrode; and a non-aqueous electrolyte, wherein the positive electrode is an electrode, which contains: graphite-carbon composite particles composed of graphite particles and a carbon layer covering the graphite particles, and containing crystalline carbon; and activated carbon, and wherein the positive electrode is capable of accumulating and releasing anions.

Abstract: A nonaqueous electrolyte secondary battery, which contains: an anode capable of accumulating or releasing metal lithium, or a lithium ion, or both; a cathode relative to the anode; and a nonaqueous electrolyte, in which a lithium salt is dissolved in a nonaqueous solvent, wherein, after repeating charge of the nonaqueous electrolyte secondary battery to an overcharge region and discharge for the charge 20 times, a charge capacity of the nonaqueous electrolyte secondary battery for 21st charge is a capacity equal to or greater than 100% SOC (State of Charge), where 100% SOC is an arbitrary capacity indicating that electric potential of the anode is reduced by 5% or greater based on a relative value, compared to electric potential thereof when SOC is 0%.

Abstract: A cathode material for Li ion secondary batteries has high output and high energy density with excellent electron conductivity and Li ion conductivity. The cathode material contains an electrode active material base containing Li, which is capable of electrode oxidation/reduction accompanied by desorption and absorption of Li ions in a potential range of 4 V or more and 5 V or less based on a metal Li negative electrode and has a reversible charge/discharge capacity accompanying the electrode oxidation/reduction in the potential range described above of 30 mAh or more per 1 g. Surfaces of primary particles of an electrode active material base are coated with a layer containing a conductive polymer and a negative ion that enables the conductive polymer to produce electron conductivity equal to or higher than the electron conductivity of the electrode active material itself.

Abstract: Provided is a power storage element, including: a positive electrode; a negative electrode containing a carbonaceous material as a negative-electrode active material; and a non-aqueous electrolytic solution obtained by dissolving an electrolyte in a non-aqueous solvent, wherein a crystallite size Lc(002) of the carbonaceous material in a c-axis direction is from 1.65 nm to 241.1 nm, and wherein cations of electrolyte ions are intercalated into and deintercalated from the negative electrode, and anions thereof are intercalated into and deintercalated from the positive electrode.

Abstract: There is disclosed a conductive resin composition, comprising: (a) a resin component, and (b) a fine carbon fiber dispersed in the resin component, wherein a graphite-net plane consisting solely of carbon atoms forms a temple-bell-shaped structural unit comprising closed head-top part and body-part with open lower-end, 2 to 30 of the temple-bell-shaped structural units are stacked sharing a common central axis to form an aggregate, and the aggregates are connected in head-to-tail style with a distance to form the fiber. The resin composition has high conductivity while maintaining the original physical properties of the resin.

Abstract: Disclosed is a storage device comprising a positive electrode material containing graphite; a negative electrode material containing an oxide of at least one metal element selected from Ti, Zr, V, Cr, Mo, Mn, Fe, Co, Ni, Cu, Zn, Sn, Sb, Bi, W and Ta, which may preferably contains a metal oxide containing at least Ti as a metal element; and an electrolyte solution. This storage device has high capacitance and high discharge voltage, thereby having high energy. Consequently, this storage device can have high energy density, while being excellent in cycle performances and rate performances.

Abstract: Disclosed is a storage device comprising a positive electrode material containing graphite; a negative electrode material containing an oxide of at least one metal element selected from Ti, Zr, V, Cr, Mo, Mn, Fe, Co, Ni, Cu, Zn, Sn, Sb, Bi, W and Ta, which may preferably contains a metal oxide containing at least Ti as a metal element; and an electrolyte solution. This storage device has high capacitance and high discharge voltage, thereby having high energy. Consequently, this storage device can have high energy density, while being excellent in cycle performances and rate performances.

Abstract: To provide electric double layer capacitors which have large electrostatic capacitances. Graphite with a BET surface area of from 10 to 300 m2/g, wherein the graphite has an energy storing ability of 10 to 200 mAh at a voltage of 1 V or more based on the oxidation-reduction potential of lithium.

Abstract: The present invention provides a positive electrode for electric double layer capacitors which can improve basic characteristics, such as energy density, of electric double layer capacitors and also can improve electric double layer capacitors in useful life and stability under high temperatures. Provided is a positive electrode for electric double layer capacitors comprising as electrode active materials a carbonaceous material having a ratio of rhombohedral crystal structure to hexagonal crystal structure in crystal structure of carbon within the range of not less than 20%.

Abstract: There is disclosed an electric double layer capacitor, wherein an active material for the positive electrode is a graphite or a graphitic material, and an active material for the negative electrode is a graphite or graphitic material different from the active material for the positive electrode, and wherein the capacitor is capable of charging/discharging at a voltage of 2.5 V or higher. The capacitor provides an electric storage system with a high voltage operation, a high capacity and a high energy while retaining the feature of high-speed charge/discharge.

Abstract: To provide electric double layer capacitors which have large electrostatic capacitances. Graphite with a BET surface area of from 10 to 300 m2/g, wherein the graphite has an energy storing ability of 10 to 200 mAh at a voltage of 1 V or more based on the oxidation-reduction potential of lithium.

Abstract: The objects of the present invention are to improve characteristics of electric double layer capacitors, such as energy density and charge-and-discharge rate, and to provide a positive electrode for electric double layer capacitors useful for the foregoing object, and a simple method for its production. Disclosed is a positive electrode for electric double layer capacitors, wherein the electrode comprises graphite particles having a specific surface area of less than 10 m2/g.

Abstract: The objects of the present invention are to improve characteristics of electric double layer capacitors, such as energy density and charge-and-discharge rate, and to provide a positive electrode for electric double layer capacitors useful for the foregoing object, and a simple method for its production. Disclosed is a positive electrode for electric double layer capacitors comprising graphite-carbon composite particles, the graphite-carbon composite particle being composed of a graphite particle and a carbon layer covering the graphite particle.

Abstract: A positive electrode for a lithium ion cell, comprising an aluminum foil, and a layer formed on the aluminum foil, wherein said layer is formed by adding 30 to 40 mass % of LiCo1-XMXO2, where M is selected from the group consisting of Ni, Fe and Al, to a spinel type of lithium manganese dioxide. Also added is a conductive agent, and a binding agent. The invention also covers a rocking chair type lithium ion cell, comprising the described positive electrode, and a negative electrode formed of a graphite-containing intercalation compound.

Abstract: A manufacturing method of spinel type manganese oxide for a lithium ion secondary cell, includes pre-firing a mixture of lithium salt including lithium carbonate, manganese oxide, and heterogeneous metal, firing the mixture at 900 to 1200° C. to form a raw material, adding in the raw material at least one of crystal growth accelerators selected from the group consisting of lithium hydroxide, lithium sulfide and a mixture thereof, and firing the resulting compound at 750 to 850° C. to form an excess lithium heterogeneous metal-doped spinel compound having a BET specific surface area of 0.5 m2/g or less.

Abstract: A manufacturing method of spinel type manganese oxide for a lithium ion secondary cell, includes pre-firing a mixture of lithium salt including lithium carbonate, manganese oxide, and heterogeneous metal, firing the mixture at 900 to 1200° C. to form a raw material, adding in the raw material at least one of crystal growth accelerators selected from the group consisting of lithium hydroxide, lithium sulfide and a mixture thereof, and firing the resulting compound at 750 to 850° C. to form an excess lithium heterogeneous metal-doped spinel compound having a BET specific surface area of 0.5 m2/g or less.

Abstract: An ion-conductor for a lithium secondary battery comprising at least an electrolyte and an additive;wherein the additive contains at least one kind of imido compound selected from the group consisting of compounds of the general formula (I): ##STR1## wherein Z is an optionally substituted alkylene group having 2 to 7 carbon atoms represented by the formula --(CH.sub.2).sub.n -- (n is an integer from 2 to 7), an optionally substituted 1,2-cyclohexylene group or an optionally substituted 1,2-phenylene group; and X is a hydrogen atom, an optionally substituted alkyl group, or an optionally substituted aralkylcarbonyl group.

Abstract: An electrolyte for a lithium secondary battery comprising an organic solvent containing an aromatic carbonate and a lithium salt dissolved in the organic solvent.