Abstract: Provided is a hybrid electric vehicle in which, in accordance with the system side of the vehicle including a fuel economy-emphasized system, a wide use-range of the SOC of a lithium ion secondary battery cell can be utilized.

Abstract: A lithium ion secondary battery includes: a negative electrode having a carbon-based negative electrode material containing graphite particles and amorphous carbon particles; and a positive electrode including a lithium composite oxide. The lithium composite oxide is represented by a general formula: LixNiyMnzCo(1-y-z)O2, where x is a numeral of 1 or more and 1.2 or less, and y and z are positive numerals satisfying the relation of y+z<1. The lithium composite oxide has a layer crystal structure and has a median particle diameter (D50) of 4.0 ?m or more and less than 6.0 ?m.

Abstract: Provided is a lithium ion secondary battery including a power generating element that includes at least one positive electrode plate, at least one negative electrode plate, and at least one separator. A ratio B/A (m?cm) of volume resistivity B (m?cm3) of the power generating element to an area A (cm2) per one positive electrode plate is 0.4 or more and less than 0.9.

Abstract: A method for producing a non-aqueous electrolyte secondary battery including an electrolyte containing an electrolyte salt, a non-aqueous solvent capable of dissolving the electrolyte salt, and plural additives, wherein at least one of the additives has a reduction potential that is nobler than the reduction potential of the non-aqueous solvent. The method includes a first charging step for maintaining battery voltage at a negative electrode potential at which the additive having the noblest reduction potential of the additives is decomposed while the non-aqueous solvent and other additives are not reduced and decomposed and a second charging step for maintaining battery voltage so as to have reduction and decomposition of at least one of the non-aqueous solvents and bring the electrical potential of the negative electrode to at least 0.7 V relative to lithium. By having a uniform reaction in an electrode, a decrease in durability is suppressed.

Abstract: A bipolar electrode is composed of a first active material layer which is, for example, a positive electrode active material layer formed to include a first active material on one side of a collector, and a second active material layer which is, for example, a negative electrode active material layer formed to include a second active material with less compressive strength than that of the first active material on the other side of the collector. Then, a density adjusting additive which is an additive material with larger compressive strength than that of the second active material is included in the second active material layer.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode having a negative electrode active material, and a separator containing an electrolyte. The electrolyte includes an electrolyte salt, a nonaqueous solvent into which the electrolyte salt can be dissolved, a first additive selected from predetermined oxalate compounds and disulfonic acid ester compounds, and a second additive that has a reduction potential less than the reduction potential of the first additive. The second additive is selected from a group having vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone, succinonitrile, and adiponitrile.

Abstract: Provided is a hybrid electric vehicle in which, in accordance with the system side of the vehicle including a fuel economy-emphasized system, a wide use-range of the SOC of a lithium ion secondary battery cell can be utilized.

Abstract: A negative electrode material for a lithium ion battery according to an embodiment of the present disclosure includes graphite particles and amorphous carbon particles. The graphite particles have a median diameter (D50) A of 8.0 ?m or more and 11.0 ?m or less. A ratio A/B of the median diameter A (?m) to a median diameter (D50) B (?m) of the amorphous carbon particles satisfies a relation of 1.1<(A/B)?2.75.

Abstract: A lithium-ion secondary battery includes an electricity generation element including a cathode including a cathode active material layer arranged on a cathode current collector, an anode including an anode active material layer arranged on an anode current collector, a separator, and an electrolyte. The anode active material layer includes graphite. When the battery is charged to 5 V, the battery has an excess ratio of 1 or higher that is a ratio of a specific capacity of the cathode to a specific capacity of the anode, and the separator has a thermal shrinkage of 13% or lower. The lithium-ion secondary battery prevents heat generation in an overcharge state and maintains safety.

Abstract: A non-aqueous electrolyte secondary battery has the internal resistance of 10 m?/Ah or less (SOC of 50%) and has a power generating element containing the following: a positive electrode obtained by forming, on the surface of a positive electrode current collector, a positive electrode active substance layer containing a positive electrode active substance; a negative electrode obtained by forming, on the surface of a negative electrode current collector, a negative electrode active substance layer containing a negative electrode active substance; and a separator. The positive electrode active substance is made to contain a spinel type lithium manganese composite oxide and a lithium nickel-based composite oxide, and the mixing ratio of the lithium nickel-based composite oxide is 50 to 70% by weight relative to the total 100% by weight of the spinel type lithium manganese composite oxide and the lithium nickel-based composite oxide.

Abstract: Provided is a lithium ion secondary battery including a power generation element, the power generation element including a positive electrode, a negative electrode, a separator, and an electrolyte solution, the positive electrode including a positive electrode current collector, and a positive electrode active material layer provided for the positive electrode current collector, the positive electrode active material layer including a positive electrode active material and binder, the negative electrode including a negative electrode current collector and a negative electrode active material layer provided for the negative electrode current collector, the negative electrode active material layer including a negative electrode active material and binder. The positive electrode has a volume resistivity in a range of 100 ?cm or more and 700 ?cm or less after at least one charging and discharging cycle.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode having a negative electrode active material, and a separator containing an electrolyte. The electrolyte includes an electrolyte salt, a nonaqueous solvent into which the electrolyte salt can be dissolved, a first additive selected from predetermined oxalate compounds and disulfonic acid ester compounds, and a second additive that has a reduction potential less than the reduction potential of the first additive. The second additive is selected from a group having vinylene carbonate, fluoroethylene carbonate, vinyl ethylene carbonate, 1, 3-propane sultone, 1, 4-butane sultone, 1, 3-propene sultone, succinonitrile, and adiponitrile.

Abstract: A bipolar electrode includes a collector; a positive electrode active material layer disposed on one surface of the collector; and a negative electrode active material layer disposed on the other surface of the collector. The quotient of the volume resistance of the collector and that of the positive and negative electrode active material layers is between 10?3 and 104. The bipolar electrode further includes a current distribution relaxation layer having a volume resistivity lower than that of either the positive electrode active material layer or the negative electrode active material layer. At least one active material layer having a volume resistivity larger than that of the current distribution relaxation layer is disposed between the current distribution relaxation layer and the collector.

Abstract: [Object] Provided is a means which is capable, with respect to a non-aqueous electrolyte secondary battery, of suppressing a decrease in capacity when the battery is used for a long period of time, and improving cycle characteristics. [Solving Means] Provided is a positive electrode active substance for a non-aqueous electrolyte secondary battery, the positive electrode active substance being a lithium-nickel-manganese-cobalt composite oxide and having true density of 4.40 to 4.80 g/cm3.

Abstract: A control device of a secondary battery has a current detection unit (103) that detects a charge current to the secondary battery (101) and a discharge current from the secondary battery (101); a calculation unit (107) that calculates, from the charge current and the discharge current, a charge-discharge efficiency and a discharge-charge efficiency when performing a charge operation and a discharge operation; a deterioration judgment unit (107) that judges a deterioration state of the secondary battery (101) from a temporal change rate of the charge-discharge efficiency and a temporal change rate of the discharge-charge efficiency; and a control unit (107) that sets a charge termination voltage of the secondary battery (101) in accordance with the deterioration state.

Abstract: A method for producing a non-aqueous electrolyte secondary battery including an electrolyte containing an electrolyte salt, a non-aqueous solvent capable of dissolving the electrolyte salt, and plural additives, wherein at least one of the additives has a reduction potential that is nobler than the reduction potential of the non-aqueous solvent. The method includes a first charging step for maintaining battery voltage at a negative electrode potential at which the additive having the noblest reduction potential of the additives is decomposed while the non-aqueous solvent and other additives are not reduced and decomposed and a second charging step for maintaining battery voltage so as to have reduction and decomposition of at least one of the non-aqueous solvents and bring the electrical potential of the negative electrode to at least 0.7 V relative to lithium. By having a uniform reaction in an electrode, a decrease in durability is suppressed.

Abstract: Provided is a lithium ion secondary battery including a power generation element, the power generation element including a positive electrode, a negative electrode, a separator, and an electrolyte solution, the positive electrode including a positive electrode current collector, and a positive electrode active material layer provided for the positive electrode current collector, the positive electrode active material layer including a positive electrode active material and binder, the negative electrode including a negative electrode current collector and a negative electrode active material layer provided for the negative electrode current collector, the negative electrode active material layer including a negative electrode active material and binder. The positive electrode has a volume resistivity in a range of 100 ?cm or more and 700 ?cm or less after at least one charging and discharging cycle.

Abstract: Provided is a lithium ion secondary battery including a power generating element that includes at least one positive electrode plate, at least one negative electrode plate, and at least one separator. A ratio B/A (m?cm) of volume resistivity B (m?cm3) of the power generating element to an area A (cm2) per one positive electrode plate is 0.4 or more and less than 0.9.

Abstract: A non-aqueous electrolyte secondary battery has the internal resistance of 10 ?/Ah or less (SOC of 50%) and has a power generating element containing the following: a positive electrode obtained by forming, on the surface of a positive electrode current collector, a positive electrode active substance layer containing a positive electrode active substance; a negative electrode obtained by forming, on the surface of a negative electrode current collector, a negative electrode active substance layer containing a negative electrode active substance; and a separator. The positive electrode active substance is made to contain a spinel type lithium manganese composite oxide and a lithium nickel-based composite oxide, and the mixing ratio of the lithium nickel-based composite oxide is 50 to 70% by weight relative to the total 100% by weight of the spinel type lithium manganese composite oxide and the lithium nickel-based composite oxide.

Abstract: A lithium ion secondary battery includes: a negative electrode having a carbon-based negative electrode material containing graphite particles and amorphous carbon particles; and a positive electrode including a lithium composite oxide. The lithium composite oxide is represented by a general formula: LixNiyMnzCo(1?y?z)O2, where x is a numeral of 1 or more and 1.2 or less, and y and z are positive numerals satisfying the relation of y+z<1. The lithium composite oxide has a layer crystal structure and has a median particle diameter (D50) of 4.0 ?m or more and less than 6.0 ?m.