Abstract: According to one embodiment, provided is an electrode group having a flat structure including a flat portion, that includes a wound body and a fixing tape wound around the wound body. The wound body is configured of a stack wound 50 turns or more with a center thereof positioned along a first direction, where the stack includes a positive electrode, a negative electrode, and a separator. In a second direction intersecting a principal surface in the flat portion, a swollen-state thickness TS when impregnated with propylene carbonate and a dry thickness TD satisfy 1.01<TS/TD<1.02. A protrusion width W at both ends in the first direction, which corresponds to a clearance between the positive and negative electrode, is within a range of 0.4 mm or more and 1 mm or less.

Abstract: A positive electrode (100) for a lithium ion battery of the present invention includes a collector layer (101); and a positive electrode active material layer (103) which is provided on each of both surfaces of the collector layer (101) and contains a positive electrode active material, a binder resin, and a conductive assistant. Further, a volume resistivity of the positive electrode (100) for a lithium ion battery is greater than or equal to 120 ?·m and less than or equal to 350 ?·m, and in a case where a specific surface area of the positive electrode active material contained in the positive electrode active material layer (103) is set as S [m2/g] and a content of the conductive assistant in the positive electrode active material layer (103) is set as W [% by mass] , S/W is greater than or equal to 0.080 and less than or equal to 0.140.

Abstract: A mixed electrode for a nonaqueous electrolyte battery includes: a first active material; a second active material that reacts with water more easily than the first active material; an organic moisture capture agent; and an organic binder that binds the first active material and the second active material. The organic moisture capture agent is present in the organic binder and the first active material has a smaller specific surface area than the second active material. Thus, the storability of the mixed electrode is improved and when the mixed electrode is applied to the battery, the cycle characteristics of the battery are improved.

Abstract: A lithium-ion secondary cell according to the present invention is provided with a positive electrode and a negative electrode. The positive electrode contains a lithium-manganese composite oxide partially substituted by magnesium as a positive electrode active material. The negative electrode contains a graphite coated with amorphous carbon as a negative electrode active material, a carbon black-based conductive aid and a fluororesin-based binding agent.

Abstract: A nonaqueous electrolyte secondary battery includes a power generating element including a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer. A main plane having the smaller area, between a main plane of the positive electrode active material layer and a main plane of the negative electrode active material layer, has an approximately rectangular shape with a short side having a length of 132 mm or more. The positive electrode active material layer and the negative electrode active material layer are provided such that the main plane of the positive electrode active material layer and the main plane of the negative electrode active material layer face each other with a separator interposed therebetween, and the positive electrode active material layer contains a binder in an amount of 2 mass % or more and 3.5 mass % or less.

Abstract: A mixed electrode for a nonaqueous electrolyte battery includes: a first active material; a second active material that reacts with water more easily than the first active material; an organic moisture capture agent; and an organic binder that binds the first active material and the second active material. The organic moisture capture agent is present in the organic binder and the first active material has a smaller specific surface area than the second active material. Thus, the storability of the mixed electrode is improved and when the mixed electrode is applied to the battery, the cycle characteristics of the battery are improved.

Abstract: A nonaqueous electrolyte secondary battery includes a power generating element including a positive electrode having a positive electrode active material layer and a negative electrode having a negative electrode active material layer. A main plane having the smaller area, between a main plane of the positive electrode active material layer and a main plane of the negative electrode active material layer, has an approximately rectangular shape with a short side having a length of 132 mm or more. The positive electrode active material layer and the negative electrode active material layer are provided such that the main plane of the positive electrode active material layer and the main plane of the negative electrode active material layer face each other with a separator interposed therebetween, and the positive electrode active material layer contains a binder in an amount of 2 mass % or more and 3.5 mass % or less.

Abstract: A nonaqueous electrolyte battery includes a positive electrode active material layer containing a positive electrode active material. The positive electrode active material contains a lithium manganese composite oxide containing sulfate and/or sulfate ions, and a lithium nickel composite oxide containing lithium hydroxide and a second alkaline compound that is not lithium hydroxide, and, per unit mass of the positive electrode active material, the molar equivalent of the sulfate and/or the sulfate ions in the lithium manganese composite oxide is more than the molar equivalent of the lithium hydroxide in the lithium nickel composite oxide and less than the molar equivalent of the second alkaline compound in the lithium nickel composite oxide.

Abstract: A lithium-ion secondary cell according to the present invention is provided with a positive electrode and a negative electrode. The positive electrode contains a lithium-manganese composite oxide partially substituted by magnesium as a positive electrode active material. The negative electrode contains a graphite coated with amorphous carbon as a negative electrode active material, a carbon black-based conductive aid and a fluororesin-based binding agent.