Abstract: Provided is a positive electrode mixture for a secondary battery, the positive electrode mixture allowing provision of a secondary battery that exhibits a high capacity maintenance rate in a charge-discharge cycle. The positive electrode mixture for a secondary battery comprises a positive electrode active material, a binder, and an organic acid, wherein the positive electrode active material comprises a lithium nickel complex oxide having a layered crystal structure, the binder comprises a vinylidene fluoride-based polymer, and when a solution prepared by suspending the positive electrode active material in pure water has a pH of A, and the content of the organic acid per 100 parts by mass of the positive electrode active material is B parts by mass, A and B satisfy the following expression (1).

Abstract: A positive electrode active material according to the present invention is a positive electrode active material that is used in a positive electrode for a lithium ion secondary battery. This positive electrode active material includes positive electrode active material particles A represented by Formula (A): Li?NixCoyM1(1-x-y)O2 (where 0<??1.15, 0.90<x?0.98, 0<y?0.10, and 0<(1-x-y)), and positive electrode active material particles B represented by Formula (B): Li?NiaCobM2(1-a-b)O2 (where 0<??1.15, 0.70?a?0.90, 0<b?0.20, and 0<(1-a-b)). M1 and M2 each independently represent one element or two or more elements selected from the group consisting of Li, B, Mg, Al, Fe, and Mn.

Abstract: A positive electrode active material of the present invention is used for a positive electrode for a lithium-ion secondary battery and includes a positive electrode active material particle A expressed by General Formula (A): Li?NixCoyMn(1?x?y)O2 (where 0<??1.15, 0.7?x?0.9, 0<y?0.2, and 0<(1?x?y)); and one kind or two or more kinds of positive electrode active material particles B selected from a positive electrode active material particle B1 expressed by General Formula (B1): Li?NiaCobAl(1?a?b)O2 (where 0<??1.15, 0.7?a?0.9, 0<b?0.2, and 0<(1?a?b)), a positive electrode active material particle B2 expressed by General Formula (B2): Li?NiaCobMn(1?a?b)O2 (where 0<??1.15, 0.2?a?0.6, 0<b?0.8, and 0<(1?a?b)), a positive electrode active material particle B3 expressed by General Formula (B3): Li?+?Mn(2?a??)MeaO4 (where 0<??1.0, 0???0.3, 0?a?0.

Abstract: A positive electrode active material according to the present invention is a positive electrode active material that is used in a positive electrode for a lithium ion secondary battery. This positive electrode active material includes positive electrode active material particles A represented by Formula (A): Li?NixCoyM1(1-x-y)O2 (where 0<??1.15, 0.90<x?0.98, 0<y?0.10, and 0<(1?x?y)), and positive electrode active material particles B represented by Formula (B): Li?NiaCobM2(1-a-b)O2 (where 0<??1.15, 0.70?a?0.90, 0<b?0.20, and 0<(1?a?b)). M1 and M2 each independently represent one element or two or more elements selected from the group consisting of Li, B, Mg, Al, Fe, and Mn.

Abstract: Provided is a secondary battery with a high electric characteristic and reliability that prevents the short circuit between a positive electrode and a negative electrode by an insulating member and that prevents or reduces the volume increase and deformation of a battery electrode assembly. A secondary battery includes a battery electrode assembly in which positive electrode 1 and negative electrode 6 are alternately laminated while separator 20 is interposed therebetween. Positive electrode 1 and negative electrode 6 include current collectors 3, 8 and active materials 2, 7, each surface of current collectors 3, 8 is provided with an application portion and a non-application portion of active materials 2, 8, and the active materials 2, 7 include a thin portion whose thickness is small.

Abstract: Provided is a positive electrode mixture for a secondary battery, the positive electrode mixture allowing provision of a secondary battery that exhibits a high capacity maintenance rate in a charge-discharge cycle. The positive electrode mixture for a secondary battery comprises a positive electrode active material, a binder, and an organic acid, wherein the positive electrode active material comprises a lithium nickel complex oxide having a layered crystal structure, the binder comprises a vinylidene fluoride-based polymer, and when a solution prepared by suspending the positive electrode active material in pure water has a pH of A, and the content of the organic acid per 100 parts by mass of the positive electrode active material is B parts by mass, A and B satisfy the following expression (1).

Abstract: A positive electrode active material of the present invention is used for a positive electrode for a lithium-ion secondary battery and includes a positive electrode active material particle A expressed by General Formula (A): Li?NixCoyMn(1-x-y)O2 (where 0<??1.15, 0.7?x?0.9, 0<y?0.2, and 0<(1-x-y)); and one kind or two or more kinds of positive electrode active material particles B selected from a positive electrode active material particle B1 expressed by General Formula (B1): Li?NiaCobAl(1-a-b)O2 (where 0<??1.15, 0.7?a?0.9, 0<b?0.2, and 0<(1-a-b)), a positive electrode active material particle B2 expressed by General Formula (B2): Li?NiaCobMn(1-a-b)O2 (where 0<??1.15, 0.2?a?0.6, 0<b?0.8, and 0<(1-a-b)), a positive electrode active material particle B3 expressed by General Formula (B3): Li?+?Mn(2-a-?)MeaO4 (where 0<??1.0, 0???0.3, 0?a?0.

Abstract: Provided is a secondary battery with a high electric characteristic and reliability that prevents the short circuit between a positive electrode and a negative electrode by an insulating member and that prevents or reduces the volume increase and deformation of a battery electrode assembly. A secondary battery includes a battery electrode assembly in which positive electrode 1 and negative electrode 6 are alternately laminated while separator 20 is interposed therebetween. Positive electrode 1 and negative electrode 6 include current collectors 3, 8 and active materials 2, 7, each surface of current collectors 3, 8 is provided with an application portion and a non-application portion of active materials 2, 8, and the active materials 2, 7 include a thin portion whose thickness is small.

Abstract: A secondary battery includes an assembly with positive and negative electrodes alternately laminated with a separator interposed therebetween, each of the electrodes includes an active material layer formed on a current collector. The active material layer has a multi-layer structure that includes first and second active material layers, all or part of a second active material layer being positioned on the first active material layer, termination positions of the active material layers being deviated in a planar direction. Insulting member is disposed to cover a border part between applied and non-applied parts of the active material layer. A difference between an average thickness at a multi-layer part where both active material layers are laminated on current collector and a thickness of the active material layer at a part where the insulating member is positioned on active material layer is 50% or more of a thickness of the insulating member.

Abstract: An objective of the present invention is to provide a lithium secondary battery which can achieve a higher capacity and a longer life without reduction in a lower voltage in the battery. In the present invention, a compound represented by general formula (I) described below is used as a cathode active material, and a compound represented by general formula (II) described below is used as an anode active material; Lia1(Nix1Mn2-x1-y1M1y1)O4??(I) wherein the M1 is at least one of Ti, Si, Mg and Al, the a1 satisfies 0?a1?1, the x1 satisfies 0.4?x1?0.6, and the y1 satisfies 0?y1?0.4; and Lia2M21-y2M3y2Oz2??(II) wherein the M2 is at least one of Si and Sn; the M3 is at least one of Fe, Ni and Cu, the a2 satisfies 0?a2?5, the y2 satisfies 0?y2<0.3, and the z2 satisfies 0<z2<2.

Abstract: An objective of the present invention is to provide a lithium secondary battery which can achieve a higher capacity and a longer life without reduction in a lower voltage in the battery. In the present invention, a compound represented by general formula (I) described below is used as a cathode active material, and a compound represented by general formula (II) described below is used as an anode active material; Lia1(Nix1Mn2-x1-y1M1y1)O4??(I) wherein the M1 is at least one of Ti, Si, Mg and Al, the a1 satisfies 0?a1?1, the x1 satisfies 0.4?x1?0.6, and the y1 satisfies 0?y1?0.4; and Lia2M21-y2M3y2Oz2??(II) wherein the M2 is at least one of Si and Sn; the M3 is at least one of Fe, Ni and Cu, the a2 satisfies 0?a2?5, the y2 satisfies 0?y2<0.3, and the z2 satisfies 0<z2<2.

Abstract: An objective of the present invention is to provide a lithium secondary battery which can achieve a higher capacity and a longer life without reduction in a lower voltage in the battery. In the present invention, a compound represented by general formula (I) described below is used as a cathode active material, and a compound represented by general formula (II) described below is used as an anode active material; Lia1(Nix1Mn2-x1-y1M1y1)O4??(I) wherein the M1 is at least one of Ti, Si, Mg and Al, the a1 satisfies 0?a1?1, the x1 satisfies 0.4?x1?0.6, and the y1 satisfies 0?y1?0.4; and Lia2M21-y2M3y2Oz2??(II) wherein the M2 is at least one of Si and Sn; the M3 is at least one of Fe, Ni and Cu, the a2 satisfies 0?a2?5, the y2 satisfies 0?y2?0.3, and the z2 satisfies 0?z2?2.

Abstract: An objective of the present invention is to provide a lithium secondary battery which can achieve a higher capacity and a longer life without reduction in a lower voltage in the battery. In the present invention, a compound represented by general formula (I) described below is used as a cathode active material, and a compound represented by general formula (II) described below is used as an anode active material; Lia1(Nix1Mn2-x1-y1M1y1)O4??(I) wherein the M1 is at least one of Ti, Si, Mg and Al, the a1 satisfies 0<a1<, the x1 satisfies 0.4?x1?0.6, and the y1 satisfies 0?y1?0.4; and Lia2M21-y2M3y2Oz2??(II) wherein the M2 is at least one of Si and Sn; the M3 is at least one of Fe, Ni and Cu, the a2 satisfies 0?a2?5, the y2 satisfies 0?y2<0.3, and the z2 satisfies 0<z2<2.