Papers by Keyword: Rechargeable Battery

Abstract: In this paper we reported on fabrication and characterization of a composite harvesting device integrated thin-film rechargeable battery on α-Si thin-film solar cell. The α-Si thin-film solar cell typically presented open-circuit voltage of 4.3 V, short-circuit current of 15.4 mA/cm² and efficiency of 7.4%. The thin-film rechargeable battery composed of Nb₂O₅/LiPON/LiMn₂O₄ systems fabricated using dry process, which showed the initial discharge capacity of about 215 μAh (or 12.4 μAh/cm²), the cycleabilty for discharge was good at keeping about 12.3 μAh/cm² with a small decreasing ratio of 0.1% per cycle and the coulombic efficiency was all over 95% for the 100 cycles. On the other hand, the discharge capacity of approximately 80% was provided by the self-charging of the solar cell for 10 min, and the coulombic efficiency was also over 95%.

Abstract: In the condition that conventional energy sources are depleted and greatly pollute environment, solar energy as a new energy type, has some advantages which conventional energy sources are not compared with, it has received more and more applications. In this paper, SCM is the control center of the system, the solar energy is convert into electricity stored in battery, and then battery powers to the water pump to ensure the normal operation of the water pump.

Abstract: V2O5 microparticles of 0.3-0.6 μm in diameter were prepared from VO(O-C3H7 i)3 in an ethanol solution by the sol-gel method. The addition of poly(ethylene glycol) and acetyl acetone into the sols was effective to control the size and spherical shape of V2O5 particles. The particles thus obtained were amorphous having a layered structure with hydrated water, and transformed into an orthorhombic phase at 500°C through a glassy state. The microparticles were positively charged in I2-containing acetone, so that they were electrophoretically deposited on the cathode with applied DC voltage. The prepared particles were used as a cathode in an electrochemical cell with a lithium metal as an anode. Discharge capacity of a rechargeable cell of Li / LiPF6 (ethylene carbonate + diethylene carbonate) / V2O5 -based composite was 110-180 mAh g-1 when the potential range and current density were 2-4 V and 0.1 mAcm-2, respectively.