A lithium ion capacitor includes a positive electrode made of a material capable of reversibly carrying either one or both of a lithium ion and an anion, a negative electrode made of a material capable of reversibly carrying a lithium ion, and an electrolytic solution made of a non-protonic organic solvent electrolytic solution of a lithium salt. A negative electrode active material is non-graphitizable carbon having a ratio of number of hydrogen atoms to number of carbon atoms of zero or more and less than 0.05. The lithium ion is doped in advance to either one or both of the negative electrode and the positive electrode so that a negative electrode potential when a cell is discharged to a voltage one half a charging voltage of the cell is 0.15 V or less relative to a lithium ion potential.

Lithium-ion capacitor

A method of making an electrode structure, the electrode structure and a double layer capacitor including the electrode structure, the method comprising the steps of: forming a plurality of electrodes, each having a current collector plate, a primary coating formed on each side of the collector plate, the primary coating including conducting carbon powder and a binder, and a secondary coating formed on each primary coating, the secondary coating including activated carbon powder, a solvent and a binder; positioning a respective separator between each electrodes while stacking the electrodes such that the respective separator is juxtaposed against respective secondary coatings of adjacent electrodes that electrically insulates the adjacent electrodes, whereby forming an electrode stack; and rolling the electrode stack into a cylindrical electrode structure.

Electrochemical double layer capacitor having carbon powder electrodes

A subject for the invention is to improve the cycle characteristics of a high-capacity secondary battery containing an active material packed at a high density, by using a particulate active material having a low aspect ratio. The invention relates to a nonaqueous-electrolyte secondary battery comprising a negative electrode and a positive electrode each capable of occluding/releasing lithium, a separator, and a nonaqueous electrolyte solution comprising a nonaqueous solvent and a lithium salt, characterized in that the separator comprises a porous film made of a thermoplastic resin containing an inorganic filler, and at least either of the following is satisfied: the active material contained in the negative electrode is a particulate active material having an aspect ratio of from 1.02 to 3; and the active material contained in the positive electrode is a particulate active material having an aspect ratio of from 1.02 to 2.2.

Nonaqueous electrolyte secondary battery

A organic electrolytic capacitor comprising a positive electrode, a negative electrode and an aprotic organic solvent of a lithium salt as an electrolytic solution, wherein a positive electrode active material is capable of reversibly holding lithium ions and anions, a negative electrode active material is capable of reversibly holding lithium ions, the negative electrode active material has three times or more capacitance per unit weight as the positive electrode active material, the weight of the positive electrode active material is larger than the weight of the negative electrode active material, and the negative electrode is provided with lithium deposited thereon in advance Ease of manufacture, high capacity and high withstanding voltage are achieved with this constitution

Organic electrolyte capacitor

A secondary power source comprising a positive electrode made mainly of activated carbon, a negative electrode made mainly of a carbon material capable of doping and undoping lithium ions and an organic electrolyte containing a solute of a lithium salt, wherein the lithium salt comprises LiN(SO 2 R f1 ) (SO 2 R f2 ) wherein each of R f1 and R f2 which are independent of each other, is a C 1-6 perfluoroalkyl group except R f1 ═R f2 ═CF 3 .

Secondary power source

An electric double layer capacitor used as a unit capacitor for forming an assembled cell type power source device by connecting a plurality of capacitor elements in series, wherein each of the capacitor elements is formed by impregnating an electrolyte in at least one pair of polarization electrode sheets between which a separator is inserted, wherein a protective circuit in which a Zener diode each having an operation resistance of 10-150 Ω at the average operation voltage of the electric double layer capacitor are connected in parallel to each of the electric double layer capacitors.

Electric double layer capacitor and an assembled cell type power source device

An electric double layer capacitor including an electrode containing carbon material as the main component, as a positive electrode and/or a negative electrode, and an electrolyte capable of forming an electric double layer at the interface with the electrode, wherein the carbon material is characterized in that in its Raman spectrum, the ratio of the peak intensity of G-band of an amorphous carbon component to the peak intensity of G-band of a graphite component is at least 0.7, and the ratio of the peak intensity of D-band of the graphite component to the peak intensity of G-band of the graphite component is at least 1.0.

Electric double layer capacitor, and carbon material and electrode therefor

The production method inexpensively provides a composite compound which comprises nickel and cobalt with few impurities, and serves as a precursor for the positive electrode active material of a lithium ion secondary battery. The composite compound is safe, has a high service capacity, has a superior charge/discharge cycle durability and can be used with a wide range of voltages. The production method for a composite compound comprising nickel, cobalt and an M element is characterized in that an aqueous solution or dispersion comprising nickel, cobalt and an M element is obtained by mixing a nickel ammine complex, a cobalt ammine complex and an M element source, and the aqueous solution or dispersion is heated to thermally decompose the nickel ammine complex and cobalt ammine complex and thereby produce a composite compound containing nickel, cobalt and an M element.

Production method for a composite compound comprising nickel and cobalt

PROBLEM TO BE SOLVED: To provide an electric double-layer capacitor, whose capacitance is large, whose resistance is low and whose reliability is high. SOLUTION: A capacitor is provided with an electrode composed mainly of a carbon material, in which the ratio of the peak intensity of a G-band in an amorphous carbon component to the peak intensity of a G-band in a graphite component in a Raman spectrum is 0.7 or higher and in which the ratio of the peak intensity of a D-band to the peak intensity of the G-band regarding the graphite component is 1.0 or higher.

Electric double-layer capacitor, carbon material for it and electrode

PURPOSE:To improve water repellency, resistance to abrasion and the like by a method wherein a first layer is formed by treating a treating agent, containing a compound capable of forming a surface having a specified value of contact angle with respect to water, while a second layer is constituted of a heat resistant polymeric thin film layer obtained by treating with treating agent containing a compound, capable of forming the heat resistant polymeric thin film, and fine polymeric particles. CONSTITUTION:A first layer or the outermost layer of a surface treated layer is constituted by treating with a treating agent containing a compound capable of forming a surface having the value of contact angle of 70 degrees or more with respect to water. A second layer or a lower layer of the first layer is constituted of a heat resistant polymeric thin film layer 2, formed by heating a thin film, obtained by treating with a treating agent containing a compound capable of forming the heat resistant polymeric thin film and fine polymeric particles, to thermally decompose the polymeric fine particles. This compound, capable of forming a surface having the value o contact angle of 70 degrees or more, is essential constituent for developing repellency as well as contamination preventing properties and reactive silane compound is effective. The second layer improves the durability of the first layer remarkably and increases adhesive property to a substrate 3.

Kawasato Takeshi

Papers

Electric double layer capacitor and an assembled cell type power source device

Electric double layer capacitor, and carbon material and electrode therefor

Production method for a composite compound comprising nickel and cobalt

Electric double-layer capacitor, carbon material for it and electrode

Surface treated substrate and manufacture thereof