溶剂交换制备高比表面超级电容器材料V_2O_5

Preparation of V_2O_5 with solvent exchange as the positive electrode material for supercapacitor

采用淬冷法制备V2O5溶胶,浸渍覆盖在泡沫镍上,并以低表面张力有机溶剂交换除去其自然吸附水。研究表明,所得凝胶比表面积可达36.67m2/g。用制备的V2O5为正极,锂片为对电极,LiPF6有机溶液为电解液,组成模拟超级电容器。以电压2V计,比功率为10kW/kg,比能量达158Wh/kg,而不经过溶剂交换过程制备的电极相同比功率下比能量为106 Wh/kg。

V2O5 sol was prepared by melting and quenching. Organic solvent exchange was used to get rid of the water from the wet gel coating on a macroporous nickel-foamed metal. The result shows the surface area of the gel is 36. 67m^2/g. A supercapacitor device is constructed by using the prepared V2O5 gel as a positive electrode and lithium as a negative electrode, 1mol/L LiPF6 organic solvent as the electrolyte. The specific energy and power of the supercapacitor are 10kW/kg and 158Wh/kg, which is compared with 10kW/kg and 106Wh/kg for the V205 gel without solvent exchange, assuming that the average working voltage of the device is 2. 0V.