Abstract: Making a positive electrode active material for lithium ion secondary batteries includes: weighting and mixing lithium carbonate and a compound containing respective metallic elements other than Li in a composition formula Li?NixCoyM21-x-y-zM2zO2+? so as to have a metallic constituent ratio of the formula to obtain a mixture, and firing the mixture to obtain a lithium composite compound. Performing, on the mixture, a first heat treatment at 200° C. to 400° C. for 0.5 to 5 hours to obtain a first precursor. A step of performing a heat treatment on the first precursor under an oxidizing atmosphere at 450° C. to 800° C. for 0.5 to 50 hours, and reacting 92 mass % or more of the lithium carbonate to obtain a second precursor, and a finishing step of performing a heat treatment on the second precursor under an oxidizing atmosphere at 755° C. to 900° C. for 0.5 to 50 hours to obtain the lithium composite compound.

Abstract: Making a positive electrode active material for lithium ion secondary batteries includes: weighting and mixing lithium carbonate and a compound containing respective metallic elements other than Li in a composition formula Li?NixCoyM21-x-y-zM2zO2+? so as to have a metallic constituent ratio of the formula to obtain a mixture, and firing the mixture to obtain a lithium composite compound. Performing, on the mixture, a first heat treatment at 200° C. to 400° C. for 0.5 to 5 hours to obtain a first precursor. A step of performing a heat treatment on the first precursor under an oxidizing atmosphere at 450° C. to 800° C. for 0.5 to 50 hours, and reacting 92 mass % or more of the lithium carbonate to obtain a second precursor, and a finishing step of performing a heat treatment on the second precursor under an oxidizing atmosphere at 755° C. to 900° C. for 0.5 to 50 hours to obtain the lithium composite compound.

Abstract: Provided are a cathode active material used for a lithium ion secondary battery having a high discharge capacity, and a small increase in internal resistance caused following charge/discharge cycles; a method for producing the same; and a lithium ion secondary battery. The cathode active material has a layered structure assigned to a space group of R-3m represented by the formula: Li1+aM1O2+? (where M1 represents metal elements other than Li containing at least Ni, ?0.05?a?0.15, ?0.1???0.1). A content of Ni is 70 atom % or more, and a generating amount of oxygen gas in the range from 200° C. to 450° C. is 30 mass ppm or less. The method comprises the steps of grinding and mixing a lithium raw material, and firing the resultant mixture in the range of 650° C. or more and 900° C. or less.

Abstract: Making a positive electrode active material for lithium ion secondary batteries includes: weighting and mixing lithium carbonate and a compound containing respective metallic elements other than Li in a composition formula Li?NixCoyM11?x?y?zM2zO2+? so as to have a metallic constituent ratio of the formula to obtain a mixture, and firing the mixture to obtain a lithium composite compound. Performing, on the mixture, a first heat treatment at 200° C. to 400° C. for 0.5 to 5 hours to obtain a first precursor. A step of performing a heat treatment on the first precursor under an oxidizing atmosphere at 450° C. to 800° C. for 0.5 to 50 hours, and reacting 92 mass % or more of the lithium carbonate to obtain a second precursor, and a finishing step of performing a heat treatment on the second precursor under an oxidizing atmosphere at 755° C. to 900° C. for 0.5 to 50 hours to obtain the lithium composite compound.

Abstract: Provided are a cathode active material used for a lithium ion secondary battery having a high discharge capacity, and a small increase in internal resistance caused following charge/discharge cycles; a method for producing the same; and a lithium ion secondary battery. The cathode active material has a layered structure assigned to a space group of R-3m represented by the formula: Li1+aM1O2+? (where M1 represents metal elements other than Li containing at least Ni, ?0.05?a?0.15, ?0.1???0.1). A content of Ni is 70 atom % or more, and a generating amount of oxygen gas in the range from 200° C. to 450° C. is 30 mass ppm or less. The method comprises the steps of grinding and mixing a lithium raw material, and firing the resultant mixture in the range of 650° C. or more and 900° C. or less.

Abstract: Provided is a method for producing a cathode active material used for a lithium secondary battery, via efficiently firing a nickel-containing precursor in a short time. The method includes the steps of mixing lithium carbonate with a compound other than Li, and firing the precursor obtained through the mixing step thereby to obtain a lithium composite compound. The firing step includes a heat treating substep of heat-treating a precursor rotating in a furnace tube (10) of a firing furnace (1). The firing furnace (1) includes a first gas feeding system that injects an oxidative gas, and a second gas feeding system that makes an oxidative gas flow in the axis direction of the furnace tube (10). The heat treating substep includes spraying an oxidative gas onto the precursor, and simultaneously exhausting a carbon dioxide gas generated from the precursor by a gas flow.

Abstract: It is an object to provide a cathode for a secondary lithium battery in which adhesiveness and flexibility thereof are simultaneously achieved and the thickness thereof is made large, and the secondary lithium ion battery that has a large capacity and is excellent in safety and cycle life using the cathode. The cathode includes a current collector and a cathode mixture layer formed on the surface of the current collector. The cathode mixture layer is formed by stacking two layers one on another, each of which contains a cathode active material, a conductive material and a binder, and the cathode active material contains a lithium-containing composite oxide that forms a polyanion.

Abstract: It is an object to provide a cathode for a secondary lithium battery in which adhesiveness and flexibility thereof are simultaneously achieved and the thickness thereof is made large, and the secondary lithium ion battery that has a large capacity and is excellent in safety and cycle life using the cathode. The cathode includes a current collector and a cathode mixture layer formed on the surface of the current collector. The cathode mixture layer is formed by stacking two layers one on another, each of which contains a cathode active material, a conductive material and a binder, and the cathode active material contains a lithium-containing composite oxide that forms a polyanion.

Abstract: The present invention provides a lithium secondary battery small in the volume variation caused by charge-discharge and excellent in cycle performance. The lithium secondary battery includes a cathode capable of storing and releasing lithium and an anode capable of storing and releasing lithium, the cathode including a lithium-nickel-manganese-cobalt compound oxide having a layered crystal structure and a lithium-manganese compound oxide having a layered crystal structure distributed in the lithium-nickel-manganese-cobalt compound oxide.

Abstract: In a refrigerant heat exchanger, a flow direction of refrigerant flowing through tubes in each of first and second units is opposite to that flowing through tubes in each of third and fourth heat-exchanging units arranged at upstream air sides, the flow directions of refrigerant flowing through first header tanks for distributing refrigerant into the tubes of the first and fourth units are the same, and the flow directions of refrigerant flowing through first header tanks for distributing refrigerant into the tubes of the second and third units are the same. Accordingly, even when a flow direction (flow rate) of refrigerant is small, a uniform temperature distribution of air can be obtained in the refrigerant heat exchanger.

Abstract: In a refrigerant heat exchanger, a flow direction of refrigerant flowing through tubes in each of first and second units is opposite to that flowing through tubes in each of third and fourth heat-exchanging units arranged at upstream air sides, the flow directions of refrigerant flowing through first header tanks for distributing refrigerant into the tubes of the first and fourth units are the same, and the flow directions of refrigerant flowing through first header tanks for distributing refrigerant into the tubes of the second and third units are the same. Accordingly, even when a flow direction (flow rate) of refrigerant is small, a uniform temperature distribution of air can be obtained in the refrigerant heat exchanger.