摘要:
Disclosed are a positive electrode active material and a method for producing an olivine-type phosphate. The positive electrode active material comprises an olivine-type phosphate represented by the following formula (I), wherein the maximum peak in an X-ray diffraction pattern obtained using a CuKα ray is the peak of the (031) plane of the olivine-type phosphate and the half-value width of the peak is 1.5° or less: AaMbPO4 (I), wherein A represents one or more elements selected from among alkali metals; M represents one or more elements selected from among transition metals; a is from 0.5 to 1.5; and b is from 0.5 to 1.5. The method for producing an olivine-type phosphate comprises preparing a raw material comprising element A, element M, and phosphorus (P) so that a A:M:P molar ratio may be a:b:1, preliminary calcining the raw material, and mainly calcining the preliminary calcined raw material.
摘要:
The invention provides a method for producing a carbon material as a negative electrode active material that can dope and undope a sodium ion. The production method of a carbon material for a sodium secondary battery includes a step of heating at a temperature of 800 to 2500° C. a compound according to Formula (1), Formula (2) or Formula (3), and having 2 or more oxygen atoms, or a mixture of an aromatic derivative 1 having an oxygen atom in the molecule and an aromatic derivative 2 having a carboxyl group in the molecule and being different from the aromatic derivative 1.
摘要:
Provided are a silicon film which can give an electrode suitable for use in high-capacity lithium secondary batteries, and a process for easily producing the silicon film. The silicon film comprises a columnar aggregate which is an aggregate of columnar structures made of Si or a Si compound. The silicon film may be a film wherein the diameter of the columnar structures is from 10 nm to 100 nm and the film thickness is from 0.2 μm to 100 μm. In the process for preparing a silicon film on a substrate by vapor deposition using a vapor deposition source made of Si or a Si compound, the temperature of the vapor deposition source is 1700 K or higher, the temperature of the substrate is lower than that of the vapor deposition source, and the temperature difference between the vapor deposition source and the substrate is 700 K or larger. In the process for preparing the silicon film, the distance (D) between the vapor deposition source and the substrate is shorter than the minimum diameter (P) of the substrate, the minimum diameter (P) being determined by viewing the substrate from the perpendicular direction. Also provided are an electrode comprising the silicon film, and a lithium secondary battery comprising the electrode as a negative electrode.
摘要:
Disclosed is a sodium ion battery comprising a positive electrode, a negative electrode, and a sodium ion nonaqueous electrolyte, wherein the negative electrode comprises a negative electrode active material and a negative electrode current collector made of aluminum or aluminum alloy. Also disclosed is use of the negative electrode current collector made of aluminum or aluminum alloy as a negative electrode current collector of a sodium ion secondary battery.
摘要:
Disclosed are a positive electrode active material and a method for producing an olivine-type phosphate. The positive electrode active material comprises an olivine-type phosphate represented by the following formula (I), wherein the maximum peak in an X-ray diffraction pattern obtained using a CuKα ray is the peak of the (031) plane of the olivine-type phosphate and the half-value width of the peak is 1.5° or less: AaMbPO4 (I), wherein A represents one or more elements selected from among alkali metals; M represents one or more elements selected from among transition metals; a is from 0.5 to 1.5; and b is from 0.5 to 1.5. The method for producing an olivine-type phosphate comprises preparing a raw material comprising element A, element M, and phosphorus (P) so that a A:M:P molar ratio may be a:b:1, preliminary calcining the raw material, and mainly calcining the preliminary calcined raw material.
摘要:
Disclosed is a mixed metal oxide which is reduced in the amount of scarce metal used therein, while having excellent performance as a positive electrode active material for secondary batteries. Also disclosed are a positive electrode for sodium secondary batteries having excellent performance, and a sodium secondary battery. Specifically disclosed is a method for producing a sodium-manganese complex metal oxide which is characterized by comprising a step for calcining a material, which contains sodium carbonate (Na2CO3) and dimanganese trioxide (Mn2O3) in such amounts that the molar ratio of sodium to manganese (Na/Mn) is not less than 0.4 but not more than 0.7, at a temperature of not less than 850° C. Also specifically disclosed are a sodium-manganese complex metal oxide produced by the method, a positive electrode for sodium secondary batteries which contains such a sodium-manganese complex metal oxide, and a sodium secondary battery.
摘要翻译:公开了一种混合金属氧化物,其中使用的稀有金属的量减少,同时具有作为二次电池的正极活性物质的优异的性能。 还公开了具有优异性能的钠二次电池用正极和钠二次电池。 具体公开了一种钠锰复合金属氧化物的制造方法,其特征在于,包括使含有碳酸钠(Na 2 CO 3)和三氧化二锰(Mn 2 O 3)的物质煅烧的工序,使得钠与锰的摩尔比 (Na / Mn)在不低于850℃的温度下不小于0.4但不大于0.7。还具体公开了通过该方法生产的钠锰复合金属氧化物,钠二次电池用正极 其含有这样的钠锰复合金属氧化物和钠二次电池。
摘要:
Disclosed is a mixed metal oxide which is extremely useful as a positive electrode active material for secondary batteries, while being reduced in the amount of a scarce metal used therein. Also disclosed are a positive electrode for sodium secondary batteries, and a sodium secondary battery. Specifically disclosed is a mixed metal oxide having an α-NaFeO2 type (layered rocksalt-type) crystal structure and represented by the following formula: NaxFe1-yMyO2 (wherein M represents one or more elements selected from the group consisting of group 4 elements, group 5 elements, group 6 elements and group 14 elements of the IUPAC periodic table and Mn; x represents a value more than 0.5 but less than 1; and y represents a value more than 0 but less than 0.5). Also specifically disclosed are a positive electrode for sodium secondary batteries, which contains the mixed metal oxide, and a sodium secondary battery.
摘要:
A polymer electrolyte comprising a sulfonated polyethersulfone having an ion-exchange group equivalent weight of 870 to 5000 g/mol, which is obtainable by sulfonating a polyethersulfone having the structural unit represented by the following structural formula, ##STR1## The polymer electrolyte is cheap, easily mold-processable by virtue of soluble property in organic solvent and thermoplastic property, easily film-processable, highly water-resistant, and suitable for a fuel cell.
摘要:
A lithium secondary battery that includes a cathode containing, as an active material, a material that can be doped/undoped with lithium ions; an anode containing, as an active material, a lithium metal, a lithium alloy or a material that can be doped/undoped with lithium ions; and a liquid or solid electrolyte. In this lithium secondary battery, the active material used in the cathode is lithiated nickel dioxide containing gallium. As a result, the lithium secondary battery attains excellent cycle and overcharge resistance characteristics and has a high energy density.