Abstract: An object of the present invention is to provide a negative electrode active material etc. which have a high capacity density and which can improve cycle characteristics of a sodium secondary battery using a molten salt electrolyte. The negative electrode active material for a sodium secondary battery using a molten salt electrolyte includes tricobalt tetroxide. In the negative electrode active material, the tricobalt tetroxide preferably has an average particle size d50 of 10 ?m or less and a maximum particle size dmax of 30 ?m or less.

Abstract: A heat resistant battery includes a positive electrode including a positive electrode current collector and a positive electrode active material fixed on the positive electrode current collector, wherein the positive electrode active material includes a sodium-containing transition metal compound capable of electrochemically storing and releasing a sodium ion; a negative electrode including a negative electrode current collector and a negative electrode active material fixed on the negative electrode current collector, wherein the negative electrode active material contains at least one selected from the group consisting of a sodium-containing titanium compound and a non-graphitizable carbon, each of the sodium-containing titanium compound and the non-graphitizable carbon capable of storing and releasing a sodium ion at a lower potential than a potential of the sodium-containing transition metal compound; and a sodium ion-conductive electrolyte provided at least between the positive electrode and the negative

Abstract: Provided is an electrode for a sodium molten-salt battery in which degradation of the electrode can be suppressed even when charging and discharging are repeated, and which has excellent cycle characteristics. The electrode for a sodium molten-salt battery includes a current collector and an electrode mixture adhering to a surface of the current collector, in which the electrode mixture includes an electrode active material and a binder containing a polymer, and the polymer does not contain a fluorine atom. The polymer can include, for example, at least one selected from the group consisting of polyamide resins and polyimide resins or at least one selected from the group consisting of acrylic resins, rubber-like polymers, and cellulose derivatives.

Abstract: Provided is a sodium molten-salt battery having good charge-discharge cycle characteristics. The sodium molten-salt battery includes a positive electrode that contains a positive electrode active material, a negative electrode that contains a negative electrode active material, and a molten-salt electrolyte that contains a sodium salt and an ionic liquid that dissolves the sodium salt. The negative electrode active material contains non-graphitizable carbon. The ionic liquid is a salt of a bis(sulfonyl)imide anion and a first onium cation that does not cause a Faradaic reaction with the non-graphitizable carbon. The molten-salt electrolyte contains a second onium cation in an amount of 1,000 ppm by mass or less. The second onium cation is represented by a general formula (1): R1R2R3R4N+ where R1 to R4 are each independently a hydrogen atom or a methyl group.

Abstract: Provided is a power supply system capable of being used in a well over a long period of time. A power supply system for a well according to the present invention includes a secondary battery having an operating temperature range including a temperature of the inside of a well and supplying power to a device installed in the well; and a charge-discharge mechanism for charging and discharging the secondary battery, and is installed in the well. The secondary battery to be used in the power supply system may be a molten salt battery, and may include a sensor and communication apparatus.

Abstract: A molten salt bath includes at least two types selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, and barium; at least one type selected from the group consisting of fluorine, chlorine, bromine, and iodine; at least one element selected from the group consisting of scandium, yttrium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, and lanthanoid; and an organic polymer having at least one type of a bond of carbon-oxygen-carbon and a bond of carbon-nitrogen-carbon. A deposit obtained using the molten salt bath, and a method of producing a metal deposit using the molten salt bath are provided.

Abstract: [Object] To provide a gas decomposition apparatus and a gas decomposition method in which no safety problems occur in spite of the application of a relatively high voltage between an anode and a cathode for the purpose of decomposing odorous gases of many types. [Solution] A catalytic electrode layer 6 that contains a catalyst and is porous; a counter electrode layer 7 that forms a pair with the catalytic electrode; and an electrolyte layer 15 that is sandwiched between the catalytic electrode and the counter electrode and has ion conductivity are included. The catalyst is held by the catalytic electrode in the form of being carried by a carrier containing a conductive material or the catalyst is directly carried by the catalytic electrode. A conductive material in the catalytic electrode, the conductive material being in contact with the catalyst, is not a noncovalent carbon material.

Abstract: Provided is a method for manufacturing a molten salt battery. The method includes a housing step (S100) for housing a positive electrode, a negative electrode and a separator in a battery container; an injecting step (S110) for injecting the molten salt into the battery container while heating the battery container; a closing step (S120) for closing the battery container with a closing lid; a heating and drying step (S130) for heating the battery container in a vacuum state with a check valve open; and a sealing step (S150) for closing the check valve. In summary, the positive electrode, negative electrode, separator and molten salt are heated and dried in a vacuum state.

Abstract: A mixture of sulphamic acid, a halogenated sulphonic acid and thionyl chloride is heated to allow the reaction to proceed, to thereby produce first intermediate products. The first intermediate products are then subjected to reaction with an alkali metal fluoride MF to produce second intermediate products. The second intermediate products is then subjected to reaction with the alkali metal fluoride MF in a polar solvent to obtain a desired product MN(SO2F)2 (where M is an alkali metal).

Abstract: Provided is a sodium molten-salt battery having good charge-discharge cycle characteristics. The sodium molten-salt battery includes a positive electrode that contains a positive electrode active material, a negative electrode that contains a negative electrode active material, and a molten-salt electrolyte that contains a sodium salt and an ionic liquid that dissolves the sodium salt. The negative electrode active material contains non-graphitizable carbon. The ionic liquid is a salt of a bis(sulfonyl)imide anion and a first onium cation that does not cause a Faradaic reaction with the non-graphitizable carbon. The molten-salt electrolyte contains a second onium cation in an amount of 1,000 ppm by mass or less. The second onium cation is represented by a general formula (1): R1R2R3R4N+ where R1 to R4 are each independently a hydrogen atom or a methyl group.

Abstract: Provided is a sodium molten-salt battery having good storage characteristics and good charge-discharge cycle characteristics. The sodium molten-salt battery includes a positive electrode that contains a positive electrode active material, a negative electrode that contains a negative electrode active material, and a molten-salt electrolyte that contains a sodium salt and an ionic liquid that dissolves the sodium salt. The ionic liquid contains a salt of an anion and a pyrrolidinium cation having, at the 1-position, a methyl group and an alkyl group having 2 to 5 carbon atoms. A content of 1-methylpyrrolidine in the molten-salt electrolyte is 100 ppm by mass or less.

Abstract: Provided are a molten-salt electrolyte having good charge-discharge cycle characteristics and a sodium molten-salt battery using the same. The molten-salt electrolyte contains an ionic liquid whose ultraviolet-visible absorption spectrum does not have an absorption peak attributable to impurities in a wavelength range of 200 to 500 nm, and a sodium salt. The sodium molten-salt battery includes a positive electrode that contains a positive electrode active material, a negative electrode that contains a negative electrode active material, and the molten-salt electrolyte. The ionic liquid is preferably a salt of an organic onium cation and a bis(sulfonyl)imide anion.

Abstract: The case for a molten salt battery is used for a molten salt battery containing as an electrolyte a molten salt containing sodium ions. The case is formed of aluminum or an aluminum alloy containing 90% by mass or more of aluminum.

Abstract: A molten-salt battery is provided with rectangular plate-like negative electrodes (21) and rectangular plate-like positive electrodes (41) each housed in a bag-shaped separator (31). The negative electrodes (21) and positive electrodes (41) are arranged laterally and alternately in a standing manner. A lower end of a rectangular tab (22) for collecting current is joined to an upper end of each negative electrode (21) close to a side wall (1A) of a container body (1). The upper ends of the tabs (22) are joined to the lower surface of a rectangular plate-like tab lead (23). A lower end of a rectangular tab (42) for collecting current is joined to an upper end of each positive electrode (41) close to a side wall (1B) of the container body (1). The upper ends of the tabs (42) are joined to the lower surface of a rectangular plate-like tab lead (43).

Abstract: A positive electrode active material for sodium molten salt batteries includes a sodium-containing metal oxide that can electrochemically intercalate and deintercalate sodium ions, wherein a ratio by mass of sodium carbonate is 500 ppm or less. A ratio by mass of sodium carbonate in the positive electrode active material is more preferably 100 ppm or less.

Abstract: Provided is an electrode for a sodium molten-salt battery in which degradation of the electrode can be suppressed even when charging and discharging are repeated, and which has excellent cycle characteristics. The electrode for a sodium molten-salt battery includes a current collector and an electrode mixture adhering to a surface of the current collector, in which the electrode mixture includes an electrode active material and a binder containing a polymer, and the polymer does not contain a fluorine atom. The polymer can include, for example, at least one selected from the group consisting of polyamide resins and polyimide resins or at least one selected from the group consisting of acrylic resins, rubber-like polymers, and cellulose derivatives.

Abstract: There is provided a metal laminated structure comprising a first metal layer, a second metal layer and a third metal layer, the first metal layer being disposed on one surface of the second metal layer, the third metal layer being disposed on the other surface of the second metal layer, the first metal layer including at least one of tungsten and molybdenum, the second metal layer including copper, the third metal layer including at least one of tungsten and molybdenum, and a method for producing the metal laminated structure.

Abstract: According to this production method, the water content of a mixture of a chromium oxide (Cr2O3) powder and a sodium carbonate (Na2CO3) powder is brought to 1000 ppm or less, and the mixture is heated in an inert gas atmosphere at a calcination temperature (850 DEG C.) where the sodium carbonate and the chromium oxide undergo a calcination reaction. Sodium chromite is thereby obtained.

Abstract: A molten salt battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte, wherein the electrolyte includes a molten salt, the molten salt contains at least sodium ions, and the moisture content We1 in the molten salt is 300 ppm or less in terms of mass ratio.

Abstract: The present invention relates to a sodium secondary battery comprising a positive electrode which includes a positive electrode current collector and a positive electrode material, the positive electrode material being carried on the positive electrode current collector, wherein the positive electrode material comprises a positive electrode active material reversibly containing sodium cation; a negative electrode which includes a negative electrode current collector and a negative electrode material, the negative electrode material being carried on the negative electrode current collector, wherein the negative electrode material comprises a negative electrode active material reversibly containing sodium cation; an electrolyte interposed at least between the positive electrode and the negative electrode; and a separator for retaining the electrolyte and separating the positive electrode and the negative electrode from each other; wherein the negative electrode active material is amorphous carbon, and the elect