Electrochemical Properties of V2O5 as the Cathode in Magnesium Organohaloaluminate Electrolyte for Mg-ion Battery

• Main Authors: Wei-Che Wang, 王韋哲
• Other Authors: 陳貞光
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/7845tt

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 103 === Magnesium ion battery has higher theoretical volumetric capacity than lithium ion battery. In this work, we synthesize high conductive V2O5-graphite composite via powder process to form porous tunnels for magnesium ion intercalation. Microstructural characterizations and X-ray diffraction are made to observe the effects of charging and discharging upon the electrode. We used 0.25 M AlCl3 + 0.50 M PhMgCl in THF solution as the electrolyte and its optimum cyclic performance was in -1~3 V region. The charging and discharging voltages of the battery were shown to operate in the range of 0.70~2.65 V, the capacitance of the positive electrode was measured 60 mA h g-1 and nearly 100% coulombic efficiency was obtained at a current density of 5 mA g-1. When the current density was increased up tp 10 mA g-1, the charging and discharging voltages were shown to operate in the range of 0.45~2.75 V. The capacitance of the positive electrode was measured 73 mA h g-1 and 99% coulombic efficiency was obtained. Energy Dispersive Spectrometer of magnesiated V2O5-graphite, confirmed that Mg was intercalated into V2O5. X-ray diffraction analysis also showed that new peaks appeared between 30° and 45° due to formation of MgxV2O5 compound.