Abstract: An electrode plate for a battery includes a current collector having a substrate and a plurality of protrusions that are carried on the substrate; and an active material layer that is carried on the current collector. The protrusions include a conductive material that undergoes plastic deformation more easily than the substrate. A lithium secondary battery includes the above electrode plate.

Abstract: A negative electrode for a lithium ion secondary battery of the present invention includes a sheet-like current collector and an active material layer carried on the current collector. The current collector includes a substrate and a surface portion that undergoes plastic deformation more easily than the substrate. The surface portion has protrusions and recesses. The active material layer includes a plurality of columnar particles containing silicon. The columnar particles are carried on the surface portion.

Abstract: A negative electrode for a lithium ion secondary battery includes a current collector, an intermediate layer formed on a surface of the current collector, and an active material layer formed on the intermediate layer. The current collector includes a metal capable of being alloyed with silicon. The active material layer includes an active material including silicon. The intermediate layer includes silicon and oxygen. The intermediate layer prevents the metal capable of being alloyed with silicon from diffusing into the active material layer. The diffusion of the constituent element of the current collector into the active material layer is suppressed.

Abstract: A negative electrode for a non-aqueous electrolyte secondary battery, including: an active material layer capable of electrochemically absorbing and desorbing at least Li; and a current collector sheet that supports the active material layer thereon and that does not react with Li, wherein the active material layer includes a plurality of deposited films or sintered films supported on a surface of the current collector sheet, and each of the deposited films or sintered films is provided with at least one groove formed in a side surface thereof, the groove extending from a top surface side towards the current collector sheet side thereof. It is preferable that the plurality of deposited films or sintered films are arranged in a grid configuration, a staggered grid configuration or a honeycomb configuration on a surface of the current collector sheet.

Abstract: A negative electrode for a lithium secondary battery and a lithium secondary battery including the negative electrode. The negative electrode includes a sheet-like current collector and an active material layer being carried thereon and including silicon atom. The active material layer includes a plurality of columnar particles, and in each columnar particle, at least a portion forming the columnar particle is grown to tilt with respect to the direction normal to the current collector. In the thickness direction of the active material layer, porosity Pc of the current collector side lower half of the active material layer and porosity Ps of the surface side upper half of the active material layer satisfy Pc<Ps.

Abstract: A method for producing a silicon oxide including the steps of supplying silicon atoms onto a substrate through an oxygen atmosphere to form a silicon oxide layer on the substrate, and separating the silicon oxide layer from the substrate and pulverizing the separated silicon oxide layer to obtain silicon oxide containing silicon and oxygen in predetermined proportions, and a negative electrode active material obtained by the production method.

Abstract: In order to enhance charge and discharge efficiency and to improve cycle characteristics by increasing a facing area between a positive electrode active material and a negative electrode active material, in a negative electrode for lithium secondary battery having a current collector and an active material layer carried on the current collector, the active material layer includes a plurality of columnar particles. The columnar particles include an element of silicon, and are tilted toward the normal direction of the current collector. Angle ? formed between the columnar particles and the normal direction of the current collector is preferably 10°??<90°.

Abstract: A negative electrode for a lithium ion secondary battery including a current collector and an active material layer carried on the current collector, wherein the active material layer includes an active material and no binder, the active material contains silicon and nitrogen, and the active material layer has a larger nitrogen ratio on a side of a first face which is in contact with the current collector than on a side of a second face which is not in contact with the current collector.

Abstract: A negative electrode for a lithium ion battery with high capacity, excellent cycle performance, and discharge performance at high load. In the negative electrode for a lithium ion secondary battery including a current collector and an active material layer carried on the current collector: the active material layer includes silicon, and an element M incapable of forming an alloy with lithium; the proportion of element M is higher in a first side contacting the current collector than in a second side opposite to the first side, in the thickness direction of the active material layer; the element M is different from the element forming the current collector; and the active material layer does not include a binder.

Abstract: To improve high temperature storage characteristic of a non-aqueous electrolyte secondary battery suitable for high input/output application, the structure of a positive electrode active material is optimized. The non-aqueous electrolyte secondary battery includes a positive electrode; a negative electrode; a separator interposed between the positive and negative electrodes; and a non-aqueous electrolyte. The positive electrode active material includes secondary particles, each formed of an aggregate of primary particles. A value (VPr) defined by the formula: VPr=(1?C/D)/(A2×B3) is not less than 0.0005 and not greater than 0.04, where an average particle size of the primary particles is A ?m, an average particle size of the positive electrode active material is B ?m, a tap density of the positive electrode active material is C g/ml, and a true specific gravity of the positive electrode active material is D g/ml.

Abstract: A negative electrode for a lithium ion secondary battery including a current collector and an active material layer carried on the current collector, wherein the active material layer includes a first layer and a second layer alternately laminated in a thickness direction of the active material layer, and wherein the first layer includes silicon or silicon and a small amount of oxygen and the second layer includes silicon and a larger amount of oxygen than the first layer. With the use of the negative electrode, it is possible to provide a high capacity lithium ion secondary battery having excellent high rate charge/discharge characteristics and superior cycle characteristics.

Abstract: In a negative electrode for a non-aqueous electrolyte secondary battery including an active material portion capable of electrochemically absorbing and desorbing Li, a current collector carrying the active material portion, and a buffer interposed between the active material portion and the current collector, the active material portion includes at least one selected from the group consisting of a Si simple substance, a Si alloy, and a Si compound, the current collector includes Cu, and the buffer has a first layer contacting the current collector and including a group A element which is at least one selected from the group A consisting of Sn, Al, and In, and a second layer contacting the active material portion and including a group B element which is at least one selected from the group B consisting of transition metal elements other than Cu.

Abstract: A negative electrode for a lithium ion secondary battery of the present invention includes a current collector and an active material layer carried on the current collector. The active material layer contains silicon and oxygen. In the thickness direction of the active material layer, an oxygen ratio of the active material is greater at the side of the active material layer in contact with the current collector than at the side of the active material layer not in contact with the current collector. The active material layer contains no binder. By using the negative electrode described above, it is possible to provide a high capacity lithium ion secondary battery having superior high rate charge/discharge characteristics and excellent cycle characteristics.

Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery of this invention includes: a lithium nickel composite oxide containing lithium, nickel, and at least one metal element other than lithium and nickel; and a layer containing lithium carbonate, aluminum hydroxide, and aluminum oxide, the layer being carried on the surface of the lithium nickel composite oxide. The lithium nickel composite oxide is composed such that the ratio of the nickel to the total of the nickel and the at least one metal element is 30 mol % or more. The layer is composed such that the amount of the lithium carbonate is 0.5 to 5 mol per 100 mol of the lithium nickel composite oxide. The total of aluminum atoms contained in the aluminum hydroxide and the aluminum oxide is 0.5 to 5 mol per 100 mol of the lithium nickel composite oxide.

Abstract: A positive electrode active material, which gives a non-aqueous electrolyte secondary battery capable of high input/output where resistance due to a battery reaction in a low temperature environment is suppressed, is produced by a method comprising: (a)providing a nickel hydroxide which is represented by the general formula Ni1−(x+y)CoxMy(OH)2, (b)heating the nickel hydroxide at a temperature not lower than 600° C. and not higher than 1000° C. to produce a nickel oxide which is represented by the general formula Ni1−(x+y)CoxMyO; and (c)mixing the nickel oxide and a lithium compound to obtain a mixture and heating the mixture at a temperature not lower than 700° C. and not higher than 850° C. to produce a lithium-containing composite oxide which is represented by the general formula LiNi1−(x+y)CoxMyO2, where 0.1≦x≦0.35 and 0.03≦y≦0.2 are satisfied and M is at least one selected from the group consisting of Al, Ti and Sn.