Abstract: A positive electrode active material for a lithium secondary battery, a manufacturing method thereof, and it is provided a positive electrode active material for a lithium secondary battery, comprising: a core containing a lithium nickel-based compound having a Ni content of 80 mol % or more; and a coating material positioned on at least a portion of the core surface; wherein, the coating material includes a first coating material containing at least one of group 5 elements and group 6 elements; and S; and a second coating material including B, LiOH, Li2CO3 and Li2SO4.

Abstract: A method of fabricating a rechargeable battery having an electrode assembly, a PCB and a battery case, wherein the electrode assembly is connected to the PCB, the method including preparing a PCB having a first surface with an external contact terminal formed thereon and having a second surface with a conductive feature formed thereon, wherein the conductive feature is electrically connected to the external contact terminal through a conductive trace, and plating the external contact terminal by electrically connecting a plating electrode to the conductive feature.

Abstract: A cap assembly for a secondary battery having a cap containing an electrolyte and an electrode assembly. The cap assembly is mounted on an upper end of the can with a gasket disposed between the cap assembly and the can. The cap assembly includes a cap cover, a current collector disposed under the cap cover, a cap plate disposed under the current collector, a circuit break disk welded on the cap plate, and an insulator disposed between the cap plate and the circuit break disk. The cap plate is provided with a safety groove and a indented projection outside the safety groove. The projection is tightly disposed between the gasket and the insulator so as to fixedly support the insulator.