Available photo-charging integrated device constructed with dye-sensitized solar cells and lithium ion battery
Developing self-chargeable lithium ion battery is of important significance for expanding the usable range of lithium ion battery and has achieved intensive attention from numerous researchers. Solar cell can generate electricity from the sunlight and ensure sustainable access to electrical power for charging lithium ion battery. Herein an available photo-charging integrated device is constructed by combining four conventional dye-sensitized solar cells and a three-electrode hybrid lithium ion battery including dye-sensitized TiO2 photo-anode, LiFePO4 electrode and metal lithium electrode. When the device is operated under solar illumination, DSSCs can provide the matched charging voltage for hybrid lithium ion battery. LiFePO4 electrode in three-electrode device plays two roles of serving as a reversible redox agent for the regeneration of dye and as the cathode for lithium ion battery. The integrated device can effectively harvest solar energy and store it in situ within the hybrid lithium ion battery through the photo-charging process. The proposed strategy is in favor of exploiting the small size, light-weight, self-chargeable battery and may hold the potential to be employed as power supply for miniaturization sensors and mobile devices.