NCM-碳纤维柔性超级电容器电极的制备及其电容性能

Fabrication and capacitance performance of NCM-carbon cloth flexible supercapacitor electrodes

为提升超级电容器的电容性能,以柔性碳纤维为基底,以Ni、Co、Mn(NCM)三元金属氧化物为活性物质,制备得到NCM-碳纤维柔性超级电容器电极材料,通过改变实验参数,优化其形貌和性能.实验结果表明:NCM三元氧化物中Ni的含量能够极大地影响其形貌和电容性能,主要表现为随着Ni含量的增加,NCM三元氧化物由稀疏分布的片状结构逐步变为密集阵列分布的纳米线,纳米线直径很小,仅10 nm左右;NCM-碳纤维复合电极材料的比电容则随着Ni含量的增加而增加,最大可达720 F/g.当Ni、Co、Mn和O的物质的量比为3∶2∶2∶4时,NCM三元氧化物电化学性能最优,不但具有较大的比电容(662 F/g),且经2 000次循环后仍保有初始比电容的96.7%,说明电容器具有极好的循环稳定性.

In order to improve the capacitance performance of supercapacitors,flexible electrodes were prepared by using Ni,Co,Mn(NCM)temary metal oxide as the active material and carbon cloth(CC)as the substrate.The morphology and perfomance of the NCM-CC electrodes were optimized by adjusting experimental parameters.The experimental results indicate that the mophology and capacitance performance of NCM-CC electrodes is greatly dependent on the content of Ni.Sparsely distributed flake-like NCM temary metal oxide gradually changes into densely distributed and arrayed nanowires having diameters of^10 nm with the increase of Ni content.The specifie capacitance of NCM-CC electrodes,the highest of which is up to 720 F/g,also increases with the increase of Ni content.The optimal capacitance is obtained from NCM-CC electrodes when the molarity proportion of Ni,Co,Mn,and O is 3:2:2:4.This electrode not only has a high specifie capacitance of 662 F/g,also posseses excellent cycling stability that the capacitance retention is 96.7%after 2 000 circles.