NOVELTY - A complex lithium secondary battery (100) comprises a dye-sensitized solar cell unit (110); and a lithium secondary battery unit (130), where the dye-sensitized solar cell unit and the lithium secondary battery unit share a common anode layer (120).    USE - As a lithium secondary battery for an electronic apparatus (claimed) useful in e.g. mobile phones, MP3 players, portable multimedia players (PMPs), personal digital assistant (PDAs), and electronic dictionaries.    ADVANTAGE - The complex lithium secondary battery can be rechargeable using solar energy as an alternative power source to when there is no power source for recharging the complex lithium secondary battery, can be bendable, and has a simple structure.    DETAILED DESCRIPTION - A complex lithium secondary battery (100) comprises a dye-sensitized solar cell unit (110); and a lithium secondary battery unit (130), where the dye-sensitized solar cell unit and the lithium secondary battery unit share a common anode layer (120). The dye-sensitized solar cell unit comprises a transparent conductive material layer (111); a reducing catalyst layer (112); a solar cell electrolyte layer (113) that reduces oxidized dye molecules; a transition metal oxide semiconductor layer (114) in which a dye is adsorbed to emit electrons when the dye absorbs light; and the common anode layer that can collect electrons from the transition metal oxide semiconductor layer. The complex lithium secondary battery further comprises a boost circuit (140) to boost an electromotive force generated from the dye-sensitized solar cell unit to a voltage greater than an operation voltage of the lithium secondary battery unit. The lithium secondary battery unit comprises an anode active material layer, a cathode active material layer, a lithium battery electrolyte layer that is disposed between the anode active material layer and the cathode active material layer and in which a lithium salt is dissolved in a non-aqueous solvent; a cathode current collector; and the common anode layer. The transition metal oxide semiconductor layer is formed by coating at least one dye. The cathode current collector is formed of an aluminum thin film or a conductive polymer film.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the complex lithium secondary battery.    Complex lithium secondary battery (100)    Solar cell unit (110)    Transparent conductive material layer (111)    Reducing catalyst layer (112)    Solar cell electrolyte layer (113)    Transition metal oxide semiconductor layer (114)    Common anode layer (120)    Lithium secondary battery unit (130)    Boost circuit (140)