摘要:
The capacitance per volume of an electric double-layer capacitor can be increased by using a raw-material carbon composition for use in a carbon material for an electrode of the electric double-layer capacitor by applying an activation process, characterized in that the raw-material carbon composition has a volatile content of 1.3% by mass to 15% by mass (both inclusive), and microstrength of 5 to 30% when the volatile content is less than 6% by mass while microstrength of 5 to 20% when the volatile content is 6% or more.
摘要:
A method for producing an activated carbon material includes forming an aqueous mixture of a natural, non-lignocellulosic carbon precursor and an inorganic compound, heating the mixture in an inert or reducing atmosphere, cooling the heated mixture to form a first carbon material, and removing the inorganic compound to produce an activated carbon material. The activated carbon material is suitable to form improved carbon-based electrodes for use in high energy density devices.
摘要:
A method for producing activated carbon for an electric double layer capacitor electrode including an activation step of obtaining an activated carbon by mixing a raw carbon material for activated carbon with an alkali metal hydroxide, and heating the mixture in an inert gas atmosphere; a deactivation and removal step of deactivating and removing alkali metal contained in the activated carbon; and a heat treatment step of heating the activated carbon passed through the deactivation and removal step to a temperature exceeding 400°C and not higher than the heating temperature in the activation step, in an inert gas atmosphere. Activated carbon produced by this method. Activated carbon for an electric double layer capacitor electrode having an alkali metal content of less than 100 mass ppm. Activated carbon for an electric double layer capacitor electrode having a specific impedance characteristic. Activated carbon for an electric double layer capacitor electrode having specific amounts of a surface functional group and a surface carboxyl group. In the electric double layer capacitor having a pair of electrodes and an electrolytic solution, at least one of the pair of the electrodes includes the activated carbon.
摘要:
The invention is directed to a carbon composition produced from a carbon precursor, a carbon precursor modifier, and an additive, wherein a mixture of the recited components is formed, the carbon precursor is cured, the resulting mixture carbonized to produce a porous carbon composition. Also disclosed are methods for preparing the carbon composition and for using the carbon composition to fabricate electrodes and electric double layer capacitors comprising the carbon composition.
摘要:
A carbonaceous material having a pore size distribution, as determined from a nitrogen adsorption isotherm, in which pores with a radius of up to 10 Å account for at most 70% of the total pore volume, and having a specific surface area, as measured by the nitrogen adsorption BET method, of 1-500 m 2 /g is optimized for the penetration of non-aqueous electrolyte solution to the interior thereof and the surface adsorption of ionic molecules so as to form an electrical double layer thereon. Electrical double-layer capacitors assembled using polarizable electrodes made with the carbonaceous material have a high voltage, a high energy density, a high capacitance, a long cycle life, and are amenable to miniaturization.
摘要:
The present invention provides an electrode material for an electrochemical capacitor having high surface utilization efficiency, composed of a porous carbon material capable of further contributing to higher electrostatic capacitance of the electrochemical capacitor and to development of high rate characteristics; the porous carbon material having a co-continuous structural portion in which a carbon skeleton and voids form respective continuous structures, the co-continuous structural portion having a structural period of 0.002 µm to 20 µm.
摘要:
The present application is directed to carbon materials comprising an optimized pore structure. The carbon materials comprise enhanced electrochemical properties and find utility in any number of electrical devices, for example, as electrode material in ultracapacitors. Methods for making the disclosed carbon materials are also disclosed.
摘要:
A method for producing activated carbon for an electric double layer capacitor electrode including an activation step of obtaining an activated carbon by mixing a raw carbon material for activated carbon with an alkali metal hydroxide, and heating the mixture in an inert gas atmosphere; a deactivation and removal step of deactivating and removing alkali metal contained in the activated carbon; and a heat treatment step of heating the activated carbon passed through the deactivation and removal step to a temperature exceeding 400°C and not higher than the heating temperature in the activation step, in an inert gas atmosphere. Activated carbon produced by this method. Activated carbon for an electric double layer capacitor electrode having an alkali metal content of less than 100 mass ppm. Activated carbon for an electric double layer capacitor electrode having a specific impedance characteristic. Activated carbon for an electric double layer capacitor electrode having specific amounts of a surface functional group and a surface carboxyl group. In the electric double layer capacitor having a pair of electrodes and an electrolytic solution, at least one of the pair of the electrodes includes the activated carbon.
摘要:
There is provided a capacitor electrode material that does not require the use of a conductive aid and can increase the capacitance of an electric double layer capacitor. A capacitor electrode material comprising resin-remaining partially exfoliated graphite obtained by pyrolyzing a resin in a composition in which the resin is fixed to graphite or primary exfoliated graphite by grafting or adsorption, the resin-remaining partially exfoliated graphite having a structure in which graphite is partially exfoliated, with part of the resin remaining; and a binder resin.