Abstract: The positive electrode active material in accordance with the present invention is used for a positive electrode for a lithium-ion secondary battery, includes Li, Mn, Ni, Co, and O atoms, and has a substantially halite type crystal structure. Specifically, it is preferably expressed by LiaMnbNicCodOe, where a is 0.85 to 1.1, b is 0.2 to 0.6, c is 0.2 to 0.6, d is 0.1 to 0.5, and e is 1 to 2 (the sum of b, c, and d being 1). Because of such composition and crystal structure, the positive electrode active material of the present invention reduces the amount of elution of the battery into the liquid electrolyte and enhances the stability at a high temperature.

Abstract: An apparatus for performing an operation on a circuit substrate, the apparatus including a plurality of operating devices which are provided in a space that is closed and opened by a safety cover and one of which performs the operation on the circuit substrate, a safety-cover switch which is switchable to an ON state thereof corresponding to a closed state of the safety cover, and to an OFF state thereof corresponding to an opened state of the safety cover, a maintenance-related control device which keeps, in a maintenance mode, at least one of the operating devices to a state thereof in which the one operating device is operable, and a maintenance-mode setting switch which cooperates with the safety-cover switch to provide a parallel circuit, and which is selectively operable to an ON state thereof in which the maintenance-mode setting switch allows setting of the maintenance mode, and to an OFF state thereof in which the maintenance-mode setting switch does not allow the setting of the maintenance mode.