Abstract: An anode material for a lithium ion secondary battery that includes a carbon material having an average interlayer spacing d002 as determined by X-ray diffraction of from 0.335 nm to 0.340 nm, a volume average particle diameter (50% D) of from 1 ?m to 40 ?m, a maximum particle diameter Dmax of 74 ?m or less, and at least two exothermic peaks within a temperature range of from 300° C. to 1000° C. in a differential thermal analysis in an air stream.

Abstract: A lithium-ion secondary battery having a positive electrode capable of occluding and releasing lithium ions, a negative electrode capable of occluding and releasing lithium ions, a separator interposed between the positive electrode and the negative electrode, an electrolytic solution, and a current breaking mechanism that works in response to the rise of the battery's internal pressure, wherein the electrolytic solution is incorporated with an aromatic compound and the positive electrode is incorporated with a carbon dioxide gas generating agent which is represented by the formula AxCO3 or AyHCO3. It is highly responsive to overcharging owing to the current breaking mechanism attached thereto which activates in the early stage of overcharging. Therefore, it exhibits high battery performance as well as high safety in the case of overcharging.

Abstract: A lithium-ion secondary battery having a positive electrode capable of occluding and releasing lithium ions, a negative electrode capable of occluding and releasing lithium ions, a separator interposed between the positive electrode and the negative electrode, an electrolytic solution, and a current breaking mechanism that activates in response to the rise of the battery's internal pressure, wherein the electrolytic solution is incorporated with an aromatic compound and the separator is incorporated with a carbon dioxide gas generating agent which is represented by the formula AxCO3 or AyHCO3. It is highly responsive to overcharging owing to the current breaking mechanism attached thereto which activates in the early stage of overcharging. Therefore, it exhibits high battery performance as well as high safety in the case of overcharging.

Abstract: Provided is a lithium ion rechargeable battery less suffering from swelling even when stored at high temperatures. Disclosed are a cathode active material, a cathode for a lithium ion rechargeable battery using the cathode active material, and a lithium ion rechargeable battery using the cathode. The cathode active material includes particles, each of the particles including a cathode material capable of intercalating and deintercalating lithium ions, and a film formed on at least part of surfaces of the particles. The film includes a compound represented by Chemical Formula (1). Examples of the compound represented by Chemical Formula (1) include lithium squarate and dilithium squarate. Preferably, the lithium ion rechargeable battery is a prismatic battery.

Abstract: An anode material for a lithium ion secondary battery that includes a carbon material having an average interlayer spacing d002 as determined by X-ray diffraction of from 0.335 nm to 0.340 nm, a volume average particle diameter (50% D) of from 1 ?m to 40 ?m, a maximum particle diameter Dmax of 74 ?m or less, and at least two exothermic peaks within a temperature range of from 300° C. to 1000° C. in a differential thermal analysis in an air stream.

Abstract: The present invention is to provide a lithium ion secondary battery that realizes to raise an initial charge and discharge efficiency without deteriorating its charge and discharge characteristic in comparison with the conventional technology. A carbon material and a lithium ion secondary battery using the carbon material as the anode material, wherein the face interval d002 of the carbon material determined by an X ray diffraction apparatus is not less than 0.340 nm and not more than 0.370 nm, and further, V1/V2 representing a ratio of a volume V1 of pores having diameters from not less than 1 nm to less than 10 nm in the carbon material with respect to a volume V2 of pores having diameters from not less than 10 nm to less than 100 nm therein is not more than 0.2.

Abstract: Provided is a lithium ion rechargeable battery less suffering from swelling even when stored at high temperatures. Disclosed are a cathode active material, a cathode for a lithium ion rechargeable battery using the cathode active material, and a lithium ion rechargeable battery using the cathode. The cathode active material includes particles, each of the particles including a cathode material capable of intercalating and deintercalating lithium ions, and a film formed on at least part of surfaces of the particles. The film includes a compound represented by Chemical Formula (1). Examples of the compound represented by Chemical Formula (1) include lithium squarate and dilithium squarate. Preferably, the lithium ion rechargeable battery is a prismatic battery.

Abstract: An object is to provide a high-capacity lithium ion secondary battery enhanced in safety against overcharging by adding an overcharge retardant additive, which is highly responsive to excessive voltage application, to a nonaqueous electrolytic solution. A lithium ion secondary battery comprising: a separator, positive and negative electrodes arranged with the separator interposed therebetween and reversibly storing/releasing lithium ions, and an organic electrolytic solution having an electrolyte containing the lithium ions dissolved therein, wherein the organic electrolytic solution contains an aromatic compound represented by a general formula (1) below: where R1 represents an alkyl group and R2 to R5 each independently represent any one of hydrogen, a halogen group, an alkyl group, an aryl group, an alkoxy group and a tertiary amine group; and a concentration of the aromatic compound is 0.1 mol/L or less.

Abstract: The gas generation and the decrease in battery capacity during high temperature storage of a lithium secondary battery are suppressed. The electrolyte contains a polymerizable compound or a polymer, the polymerizable compound contains a compound having an aromatic functional group and a polymerizable functional group and a compound having a complex-forming functional group forming a complex with a metal ion and a polymerizable functional group, and the polymer has the complex-forming functional group, the aromatic functional group and a residue of the polymerizable functional group.

Abstract: The preparation of a slurry so as to exhibit no strong alkalinity not only needs a strict pH control, but also needs once dispersing a positive electrode material in water and the operation of drying after the treatment, and other operations, thereby leading to the complication of the operations and a decrease in the yield. In consideration of the above-mentioned problems, the present invention provides a method for producing a positive electrode plate for a lithium ion rechargeable battery, which exhibits less complication of the operations and less decrease in the yield and can prevent the gelation of a positive electrode material slurry. The above-mentioned problems can be solved by a positive electrode for a lithium ion rechargeable battery containing a positive electrode active material capable of absorbing/desorbing lithium ions, a nitrile group-containing polymer, and a binder.

Abstract: A lithium secondary battery having improved output power includes a plurality of wound electrode bodies in a battery can. Each wound electrode body is formed by winding a cathode and an anode with a separator placed the separator between the cathode and the anode. Each of the wound electrode bodies has a capacity of 1.5 Ah or less. The cathode includes a cathode current collector foil and cathode materials. End portions of the cathode are located on two end sides of the cathode current collector foil and include shorter sides of the cathode current collector foil, respectively. The active portion of the cathode has a cathode mixture deposited thereon and is sandwiched between the end portions. Cathode tabs extend from the end portions of the cathode current collector foil. The anode includes an anode current collector foil and anode materials, where both edges do not have an anode mixture.

Abstract: The present invention is to provide a lithium ion secondary battery that realizes to raise an initial charge and discharge efficiency without deteriorating its charge and discharge characteristic in comparison with the conventional technology. A carbon material and a lithium ion secondary battery using the carbon material as the anode material, wherein the face interval d002 of the carbon material determined by an X ray diffraction apparatus is not less than 0.340 nm and not more than 0.370 nm, and further, V1/V2 representing a ratio of a volume V1 of pores having diameters from not less than 1 nm to less than 10 nm in the carbon material with respect to a volume V2 of pores having diameters from not less than 10 nm to less than 100 nm therein is not more than 0.2.

Abstract: There is disclosed a lithium secondary battery which is high in output characteristics and excellent in long-life properties. This battery comprises electrodes-wound bodies each constructed such that a lithium storable/releasable positive electrode and a lithium storable/releasable negative electrode are wound together with an electrolyte and a separator being interposed between these electrodes. The electrodes-wound bodies are electrically connected in parallel by making use of a collector to form a group of electrodes and the group of electrodes is housed in a square battery case.

Abstract: Disclosed is an electrolyte membrane which is slowly degraded by a peroxide occurring at an air electrode catalyst layer, is low in cost, and is long in life, and a membrane electrode assembly. The electrolyte membrane has a first electrolyte layer which has an ion conductivity, a second electrolyte layer which has an ion conductivity, and, upon surface contact with methanol, is thicker than the first electrolyte layer, has a larger ion exchange equivalent, or a larger number average molecular weight, and a porous layer which has an ion conductive electrolyte impregnated therein, formed between the first electrode layer and the second electrode layer.

Abstract: Sulfoalkyl groups or sulfonic groups as proton-conductive groups, and a phosphoalkyl group as oxidation-resistance imparting groups are introduced into a hydrocarbon electrolyte membrane. A fuel cell is provided wherein the membrane is insoluble in an aqueous methanol solution as a fuel and can stably generate electricity over extended periods of time. Sulfoalkyl groups or sulfonic groups as proton-conductive groups, and phosphoalkyl groups as oxidation-resistance imparting groups are introduced into a hydrocarbon electrolyte, and the resulting hydrocarbon electrolyte is used as an electrolyte of an electrode. A direct-methanol fuel cell (DMFC) is provided wherein the fuel cell is inexpensive and can operate stably over extended periods of time.

Abstract: The object of the invention is to improve the output performance of a fuel cell. The object is attained by a film electrode junction, characterized in that it comprises a polymer electrolyte film and a cathode electrode and an anode electrode between which the polymer electrolyte film is interposed, the cathode electrode and anode electrode respectively contain a carbon powder, an electrode catalyst supported on the carbon powder and a polymer electrolyte binder, at least one of the polymer electrolyte of the cathode electrode on the fuel feeding side and the cathode side of the polymer electrolyte film is an electrolyte containing fluorine, and the polymer electrolyte of the anode electrode is a hydrocarbon electrolyte.

Abstract: It is an object of the present invention to provide a fuel cell equipped with a membrane electrode assembly which can relax stress concentration at a catalyst layer end to prevent an electrolyte membrane damage and have high reliability. The membrane electrode assembly comprises an electrolyte membrane coated with an anode catalyst layer and anode diffusion layer on one side and with a cathode catalyst layer and cathode diffusion layer on the other side, wherein the anode and cathode catalyst layers have the same or essentially the same area and are set out at the same or essentially the same positions across the electrolyte membrane, and at least one of the anode and cathode diffusion layers is out of alignment, at least at one end, with the corresponding electrode catalyst layer to relax stress concentration at a catalyst layer end and prevent an electrolyte membrane damage.

Abstract: It is an object to provide a fuel cell power system which can produce an output stably for extended periods without sensing or estimating and controlling fuel concentration. The fuel cell power system is equipped with a plurality of electrically connected single cells running on a liquid fuel, each having an anode for oxidizing a fuel supplied to the cells and cathode for reducing oxygen with an electrolyte membrane in-between, wherein the fuel concentration is kept at a constant level by virtue of well balanced associated water, fuel cross-over and the like to produce an output stably for extended periods when the electrolyte membrane has a liquid fuel permeability of 70 mA/cm2 or less and a make-up liquid fuel has a concentration of 15% by weight or more.

Abstract: A fuel cell power source is provided with a means for feeding a liquid fuel cell and water through time-sharing with the use of a single pump so as to maintain concentration of the liquid fuel, thereby it is possible to decrease the number of accessories in order to reduce the size of the fuel cell power source and as well to reduce the costs.