Abstract: A battery having a low internal resistance is provided. A secondary battery includes an electrode wound body, a positive electrode current collector plate, a negative electrode current collector plate, and an outer package. The electrode wound body has a structure in which a positive electrode having a band shape and a negative electrode having a band shape are stacked with a separator interposed therebetween, and are in a wound configuration. The outer package contains the electrode wound body, the positive electrode current collector plate, and the negative electrode current collector plate. The negative electrode includes, on a negative electrode foil having a band shape, a negative electrode active material covered part covered with a negative electrode active material layer, and a negative electrode active material uncovered part.

Abstract: A secondary battery includes a positive electrode, a negative electrode, a negative electrode wiring line, and an electrolytic solution. The negative electrode wiring line is coupled to the negative electrode. The negative electrode includes a negative electrode active material layer and a film. The film covers a surface of the negative electrode active material layer. The film includes sulfur as a constituent element. The electrolytic solution includes a chain carboxylic acid ester.

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes a solvent and an electrolyte salt. The solvent includes a first ester compound and a second ester compound. The first ester compound is represented by R1-C(?O)—OR2, where each of R1 and R2 represents a first alkyl group, R1 has carbon number from 1 to 3 both inclusive, and the sum of the carbon number of R1 and the carbon number of R2 is from 3 to 5 both inclusive. The second ester compound is represented by R3O—FP(?O)—OR4, where each of R3 and R4 represents a second alkyl group, and the sum of the carbon number of R3 and the carbon number of R4 is from 2 to 10 both inclusive. The content of the first ester compound in the solvent is 30 vol % or more.

Abstract: An analytical device is provided. The analytical device includes a battery condition analysis section configured to detect a state change of a constituent member of a battery based on a change in peak of a relaxation time in a predetermined frequency band.

Abstract: A secondary battery includes a wound electrode body having a positive electrode, a negative electrode, and a separator. The positive electrode and the negative electrode are stacked on each other with the separator interposed therebetween and are wound about a winding axis. The wound electrode body has a section perpendicular to the winding axis. The section has an elongated shape that includes a flat part and a pair of curved parts. The curved parts oppose each other with the flat part interposed therebetween. The negative electrode includes a negative electrode current collector and a negative electrode active material layer provided on the negative electrode current collector. A ratio of a second distance to a first distance is less than 1.

Abstract: A secondary battery includes a wound electrode body. The wound electrode body includes a positive electrode, a negative electrode, and a separator. The positive electrode and the negative electrode are stacked on each other with the separator interposed therebetween and are wound about a winding axis. The wound electrode body has a section perpendicular to the winding axis. The section has an elongated shape that includes a flat part and a pair of curved parts. The curved parts oppose each other with the flat part interposed therebetween. The negative electrode includes a negative electrode current collector and a negative electrode active material layer provided on the negative electrode current collector. A width of the wound electrode body, a wound-layer number of the wound electrode body, and a ratio of a second distance to a first distance satisfy at least one of Condition A and Condition B.

Abstract: A battery includes a wound electrode body with a substantially cylindrical shape, and an exterior material. The wound electrode body includes a positive electrode, a negative electrode, and a separator. The exterior material is configured to cover the wound electrode body. In at least one round from an outermost periphery of winding of the wound electrode body, one or more of a positive electrode, a negative electrode, a positive electrode current collector and a negative electrode current collector include at least one convex portion projecting in an outer peripheral direction.

Abstract: A secondary battery includes: a cathode; an anode including a carbon material; and non-aqueous electrolytic solution. A photoelectron spectrum of oxygen 1s is obtained from an analysis of the anode by X-ray photoelectron spectroscopy. A first peak positioned in vicinity of 1360 reciprocal centimeters and a second peak positioned in vicinity of 1580 reciprocal centimeters are obtained from an analysis of the carbon material by Raman spectroscopy. A half band width ?W1 of the photoelectron spectrum is about 3 electron volts or more. A half band width ?W2 of the second peak is about 19 reciprocal centimeters or more. A ratio I1/I2 of intensity I1 of the first peak to intensity I2 of the second peak is from about 0.15 to about 0.3 both inclusive.

Abstract: A secondary battery includes a cathode, an anode, and an electrolytic solution. The anode or the electrolytic solution, or both contain a metal salt including an unsaturated carbon bond.

Abstract: An anode and a secondary battery capable of improving the charge and discharge efficiency are provided. The anode includes an anode current collector, and an anode active material layer provided on the anode current collector. The anode active material layer has a plurality of anode active material particles containing at least one of a simple substance of silicon, a compound of silicon, a simple substance of tin and a compound of tin, and has a coat containing an oxo acid salt in at least part of the surface of the anode active material particles.

Abstract: A secondary battery having a cathode, an anode, and an electrolyte is provided. The cathode includes a cathode active material containing at least one kind selected from the group consisting of sulfur S and phosphorus P in a portion near the particle surface of a lithium composite oxide. A content of the kind in the portion is larger than that in the particle of the lithium composite oxide.

Abstract: A battery including an anode with an anode active material layer that includes anode active material particles made of an anode active material including at least one of silicon and tin as an element. An oxide-containing film including an oxide of at least one kind selected from the group consisting of silicon, germanium and tin is formed in a region of the surface of each anode active material particle in contact with an electrolytic solution by a liquid-phase method such as a liquid-phase deposition method. The region in contact with the electrolytic solution of the surface of each anode active material particle is covered with the oxide-containing film. The thickness of the oxide-containing film is preferably within a range from 0.1 nm to 500 nm both inclusive.

Abstract: An analytical device is provided. The analytical device includes a battery condition analysis section configured to detect a state change of a constituent member of a battery based on a change in peak of a relaxation time in a predetermined frequency band.

Abstract: A secondary battery having a cathode, an anode, and an electrolyte is provided. The cathode includes a cathode active material containing at least one kind selected from the group consisting of sulfur S and phosphorus P in a portion near the particle surface of a lithium composite oxide. A content of the kind in the portion is larger than that in the particle of the lithium composite oxide.

Abstract: A secondary battery is provided. The secondary battery includes a cathode; an anode; and a non-aqueous electrolytic solution, wherein the cathode includes any one of a first lithium-containing compound and a second lithium-containing compound, the first lithium-containing compound having a bedded salt-type crystal structure, wherein the first lithium-containing compound includes one or more metal elements (M) other than lithium (Li), wherein the second lithium-containing compound having an olivine-type crystal structure, and wherein the nonaqueous electrolytic solution includes an unsaturated cyclic compound.

Abstract: A secondary battery includes: a cathode including an active material; an anode; and an electrolytic solution, and the active material includes a plurality of active material particles as primary particles and a carbon material. The active material particles contain a polyanion-based compound. The carbon material contains a first carbon material present on surfaces of the active material particles, and a second carbon material present between the active material particles provided with the first carbon material. A ratio B/A between a total carbon amount A and a surface carbon amount B of the active material satisfies 7<B/A<11.5. A ratio D/C between a specific surface area C of the active material, and an oil feed amount D of N-methyl-2-pyrrolidone satisfies 1.5<D/C?2.

Abstract: A battery is composed of a positive electrode in which a positive electrode active material layer including a positive electrode active material is formed on a positive electrode collector, a negative electrode in which a negative electrode active material layer including a negative electrode active material is formed on a negative electrode collector, a separator provided between the positive electrode and the negative electrode, and an electrolyte impregnated in the separator. The battery further includes at least one of a heteropoly acid and a heteropoly acid compound as an additive at least in one of the positive electrode, the negative electrode, the separator, and the electrolyte.

Abstract: A battery including a cathode, an anode, and an electrolytic solution. The electrolytic solution is impregnated in a separator provided between the cathode and the anode. The anode has an insulative coat on an anode active material layer provided on an anode current collector. The coat contains an insulating material such as a meal hydroxide and a metal oxide. The coat is in a form of plate divided into a plurality of portions. The insulation property of the coat prevents internal short circuit. A plurality of portions of the coat prevent separation of the anode active material layer and decomposition of the electrolytic solution. Further, even when short circuit occurs, heat generation is prevented by heat absorption characteristics of the coat.

Abstract: A secondary battery includes a cathode, an anode, and an electrolytic solution. The anode or the electrolytic solution, or both contain a metal salt including an unsaturated carbon bond.

Abstract: A secondary battery includes a cathode, an anode, and an electrolytic solution. The anode or the electrolytic solution, or both contain a metal salt including an unsaturated carbon bond.