Abstract: A positive electrode composite active material, a lithium ion secondary battery, a method for producing a positive electrode composite active material, a method for producing a lithium ion secondary battery, and a composite active material is provided. The positive electrode composite active material includes a positive electrode active material and an oxide-based solid electrolyte. The positive electrode active material is coated with the oxide-based solid electrolyte. The oxide-based solid electrolyte is represented by Li1+p+q+rAlpGaq(Ti,Ge)2?p?qSirP3?rO12 (0<p?1, 0?q<1, 0?r?1). The oxide-based solid electrolyte is layered and has a coating thickness of 5 nm or more and 50 nm or less. In the oxide-based solid electrolyte, an amorphous portion and a crystalline portion are mixed, and the amorphous portion is in contact with the positive electrode active material.

Abstract: A power storage device has a secondary battery which has a positive electrode, a negative electrode, and a nonaqueous electrolyte disposed between the positive and negative electrodes; in the secondary battery, metal ions are movable between the positive and negative electrodes through the nonaqueous electrolyte, and the positive and negative electrodes are charged/discharged when insertion/extraction reactions of the metal ions are carried out through the nonaqueous electrolyte; the positive and negative electrodes each contain an active-material layer with an average thickness of 0.3 mm or greater; the charging device is electrically connected to the secondary battery, and charges the secondary battery only at a constant current; and when the secondary battery is charged to its end-of-charge voltage by the charging device, its capacity is set to be 80% to 97% of the design capacity calculated from the inherent capacity per unit weight of the positive and negative electrodes.

Abstract: A battery pack includes a plurality of laminate batteries. Each of the laminate batteries contains a layered body, an outer packaging that is formed from a laminate film enclosing the layered body, a pair of electrode terminals. The outer packaging has a battery part and a bag part that is a space of which a volume is changeable, and communicates to the battery part through a single communication part, the bag part is disposed close to a second edge, which is opposite to a first edge, and the battery part is disposed close to the first edge. The laminate batteries are all arranged in a manner to have the second edges of the outer packagings on an upper side of the battery pack in a vertical direction, which is parallel to the gravity, and to have the first edge on a lower side of the battery pack in the vertical direction such that all the bag parts are disposed above the battery parts in the vertical direction.

Abstract: A power storage device provided according to the present invention is capable of preventing a state of overcharge without using a battery for detecting the depth of charge during charging. Such a power storage device is structured to have a secondary battery and a charging device; the secondary battery is structured to have a positive electrode, a negative electrode, and a nonaqueous electrolyte disposed between the positive and negative electrodes; in the secondary battery, metal ions are movable between the positive and negative electrodes through the nonaqueous electrolyte, and the positive and negative electrodes are charged/discharged when insertion/extraction reactions of the metal ions are carried out through the nonaqueous electrolyte; the positive and negative electrodes each contain an active-material layer with an average thickness of 0.

Abstract: A battery pack containing a plurality of plate-shaped laminate batteries arranged in a direction vertical to a plate-shaped surface of one of the laminate batteries. The laminate battery contains: a layered body which includes a negative electrode, a separator, and a positive electrode, and is disposed parallel to the plate-shaped surface of the laminate battery; an outer packaging including a laminate film enclosing the layered body; and an electrode terminal which is electrically connected to the layered body and extends from a one side part of the outer packaging. The outer packaging has, in an inside thereof, a battery part having a space in which the layered body exists and a bag part which has a space a volume of which is changeable, communicates to the battery part through a communication part, and is disposed on an other side part opposite to the one side part.