NOVELTY - A secondary battery, comprises a cathode; an anode; and an electrolytic solution, where the cathode includes a lithium-rich lithium-containing compound having a bedded salt-type crystal structure, and a product SD of a specific surface area S in square meters per g and a crystallite diameter D in micrometer of the lithium-containing compound is greater than or equal to 1.4x 10-6 cubic meters per g.    USE - As lithium secondary battery used in battery pack, electric vehicle, electric power storage system, electric power tool, and an electronic apparatus (claimed) such as a video camcorder, a digital still camera, a mobile phone, a notebook personal computer, a cordless phone.    ADVANTAGE - The secondary battery is high performance and multi-function battery; and has improved the load characteristics.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a cathode active material comprising a lithium-rich lithium-containing compound having a bedded salt-type crystal structure, where a product SD is greater than or equal to 1.4x 10-6 cubic meters per g;    (2) cathode comprising the lithium-rich lithium-containing compound having the bedded salt-type crystal structure, where the product SD is greater than or equal to 1.4x 10-6 cubic meters per g;    (3) battery pack comprising the secondary battery; a control section controlling an used state of the secondary battery; and a switch section switching the used state of the secondary battery according to an instruction of the control section;    (4) an electric vehicle comprising the secondary battery; a conversion section converting electric power supplied from the secondary battery into drive power; a drive section operating according to the drive power; and a control section controlling an used state of the secondary battery;    (5) an electric power storage system, comprising the secondary battery; at least one electric device supplied with electric power from the secondary battery; and a control section controlling the supplying of the electric power from the secondary battery to the electric devices;    (6) an electric power tool comprising the secondary battery; and a movable section being supplied with electric power from the secondary battery; and    (7) an electronic apparatus comprising the secondary battery as an electric power supply source.