Abstract:
Partículas de tetraóxido de trimanganeso poroso que llevan partículas primarias de tetraóxido de trimanganeso aglomeradas, cuyo tamaño medio de partícula primaria es como máximo de 2 μm, siendo el volumen de poro de al menos 0,5 ml/g, medido mediante una técnica de intrusión de mercurio.
Abstract:
Un óxido de manganeso que tiene una fracción de volumen de poros no mayor al 20% para poros con diámetros de 10 μm o más, medido por porosimetría de mercurio, y una densidad de compactación de 1.6 g/cm3 o mayor y un tamaño de partícula medio de 1-50 μm.
Abstract:
Partículas combinadas de tetraóxido de trimanganeso que contiene un metal, obtenidas por un proceso que comprende: una etapa de cristalización de tetraóxido de trimanganeso no mediante hidróxido de manganeso o en condiciones en las que se suprime el crecimiento cristalino del hidróxido de manganeso, a partir de una solución acuosa de sal de manganeso que contiene iones manganeso y un elemento metálico distinto del manganeso y el litio que es Mg, en las que, en la etapa de cristalización, el tetraóxido de trimanganeso sustituido con un metal se cristaliza en condiciones que satisfacen un pH de al menos 6 y como máximo 9 y un potencial de oxidación-reducción de al menos 0 mV y como máximo 300 mV, en las que las partículas combinadas de tetraóxido de trimanganeso que contiene un metal son partículas en las que el manganeso en la estructura cristalina del tetraóxido de trimanganeso está sustituido con Mg, que están representadas por la siguiente fórmula (1): AxMn3-xO4 (1) en la que A es Mg, y x es como máximo 1 y como mínimo 0,01, que tienen una densidad compactada de al menos 1,1 g/cm3, y en las que el coeficiente de variación de la desviación estándar de la distribución del tamaño de partícula es como máximo del 50 %.
Abstract:
There is provided manganese oxide having a pore volume fraction of no greater than 20% for pores with diameters of 10 µm or greater, as measured by mercury porosimetry, and a tap density of 1.6 g/cm 3 or greater, and a method for producing it. There is also provided a method for producing a lithium manganese composite oxide using the manganese oxide.
Abstract:
To provide trimanganese tetraoxide which has high reactivity with a lithium compound and is excellent in the handling efficiency, and which is suitable as a manganese material of a lithium manganese oxide, and its production process. Trimanganese tetraoxide particles comprising trimanganese tetraoxide primary particles having an average primary particle size of at most 2 µm agglomerated, the pore volume of pores being at least 0.4 mL/g. The most frequent pores are preferably pores having a diameter of at most 5 µm. The trimanganese tetraoxide particles can be obtained by a process for producing trimanganese tetraoxide particles, which comprises a crystallization step of directly crystallizing trimanganese tetraoxide from a manganese salt aqueous solution, wherein in the crystallization step, the manganese salt aqueous solution and an alkali aqueous solution are mixed so that the oxidation-reduction potential is at least 0 mV and OH - /Mn 2+ (mol/mol) is at most 0.55, to obtain a slurry, and the solid content concentration of the slurry is adjusted to be at most 2 wt%.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing manganese oxide which can be used for an industrial scale and of which the iron content is extremely small, and to provide the manganese oxide of which the iron content is extremely small.SOLUTION: In a method for manufacturing manganese oxide, the manganese oxide is deposited from a solution containing organic acids and manganese ions. It is preferable that the organic acids are at least one sort selected from the group consisting of aconitic acid, ascorbic acid, adipic acid, amino acid, citric acid, glutaric acid, succinic acid, oxalic acid, tartaric acid, lactic acid, fumaric acid, maleic acid, malonic acid, and malic acid.
Abstract:
PROBLEM TO BE SOLVED: To provide trimanganese tetroxide having high reactivity with a lithium compound, excellent in handleability, and suitable as a manganese raw material for a lithium/manganese-based composite oxide; and to provide a method for producing the same.SOLUTION: Trimanganese tetroxide particles having the pore volume of the pores of ≥0.4 mL/g are obtained by agglomerating trimanganese tetroxide primary particles having a mean primary grain size of ≤2 μm. Preferably, the modal pores are pores having a diameter of ≤5 μm. The trimanganese tetroxide particles are obtained by a production method which is a method for producing trimanganese tetroxide particles including a crystallization step of directly crystallizing trimanganese tetroxide from an aqueous manganese salt solution, wherein the crystallization step comprises mixing the aqueous manganese salt solution and an aqueous alkaline solution at an oxidation-reduction potential of ≥0 mV and at OH/Mn(mol/mol) of ≤0.55 to obtain slurry, and causing the solid content concentration of the slurry to be ≤2 wt.%.
Abstract:
PROBLEM TO BE SOLVED: To provide a manganese oxide which gives a lithium manganese based composite oxide excellent as a positive electrode material for a lithium secondary battery, and to provide a method for producing the manganese oxide, and to provide a lithium manganese based composite oxide using the manganese oxide.SOLUTION: The manganese oxide has a 20% or lower pore volume fraction of pores having a diameter of 10 μm or greater as measured by a mercury intrusion technique, and has a tap density of 1.6 g/cmor higher. Further, a method for producing the manganese oxide and a method for producing the lithium manganese based composite oxide using the manganese oxide are also provided.