NOVELTY - Secondary battery comprises a cathode (21) including a lithium-oxygen-containing compound, an anode (22), and non-aqueous electrolytic solution including at least one first anions (I).    USE - The secondary battery is useful: as a lithium secondary battery, an electric vehicle an electric power storage system and a battery pack (all claimed) that is used as an attachable and detachable electric power source of a notebook personal computer; and in e.g. a video camcorder, a digital still camera, a mobile phone, a notebook personal computer, a cordless phone, a headphone stereo, a portable radio, a portable TV, and a portable information terminal, electric shaver, a storage device (such as a backup electric power source and a memory card), an electric power tool (such as an electric drill and an electric saw), a medical electronic apparatus (such as a pacemaker and a hearing aid), an electric automobile (including a hybrid automobile), and a home battery system for accumulating electric power for emergency.    ADVANTAGE - The secondary battery exhibits superior battery characteristics such as cycle retention rate, conservation retention rate and load retention rate, and suppresses the decrease in the discharge capacity in a high temperature or low temperature environment.    DETAILED DESCRIPTION - Secondary battery comprises a cathode (21) including a lithium-oxygen-containing compound, an anode (22), and non-aqueous electrolytic solution including at least one first anions of formula B(XY)xFyRz- (I).    X1a=one of divalent chain hydrocarbyl, divalent fluorinated chain hydrocarbyl or absent;    Y1a=one of cyano or isocyano;    R1a=one of monovalent fluorinated chain hydrocarbyl or monovalent fluorinated cyclic hydrocarbyl; and    x=greater than 0;    y,z= greater than or equal to 0;    (x+y+z)=4; and    (y+z)=greater than 0.    INDEPENDENT CLAIMS are also included for:    (1) a battery pack comprising the secondary battery, a control section configured to control operation of the secondary battery, and a switch section configured to switch the operation of the secondary battery according to an instruction of the control section;    (2) an electric vehicle comprising the secondary battery, a conversion section configured to convert electric power supplied from the secondary battery into drive power, a drive section configured to operate according to the drive power, and a control section configured to control operation of the secondary battery; and    (3) an electric power storage system comprising the secondary battery, at least one electric device configured to be supplied with electric power from the secondary battery, and a control section configured to control the supplying of the electric power from the secondary battery to the one or more electric devices.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the secondary battery.    Battery can (11)    Battery cover (14)    Cathode (21)    Anode (22)    Separator (23)