基于纳米片状二氧化锰的柔性固态超级电容的性能研究

Performance of flexible supercapacitor with MnO_2 nanoflakes as electrode materials

采用电化学沉积法,将纳米片状二氧化锰材料沉积在涂覆有石墨材料的柔性纸衬底上,并采用扫描电子显微镜分析观察了产品的形貌。结果表明,二氧化锰为纳米片状结构,可以大幅提高电极材料的比表面积。将H_3PO_4作为固态电解质,组装成超级电容,在不同扫描速度下作循环伏安测试,电容量达到113.5 mA·h/g(在电流密度为0.1 A/cm^2时)。将组装的电容进行180°弯折处理,电容量未发生改变,而充放电时间略有增加。循环充放电10 000次后,电容量保持在原始电容量的85%以上,具有柔性超级电容的特性。

The MnO2 nanoflakes were deposited on flexibility paper coated graphite via electrochemistry deposition method.The morphology of the product was characterized by SEM.The results showed that the structure of the MnO2 was nano-scale,which can greatly increase the specific surface area of the electrode.The H3PO4 was used as solid-state electrolyte to assemble supercapacitor.The cyclic voltammogram tests in different scanning speeds showed that the capacitance of the supercapacitor achieved to 113.5 m A·h/g,when the current density was 0.1 A/cm^2.After the supercapacitor were bent by 180°,the capacitance have not be changed,but charge-discharge time had a litter enlonged,and after 10 000 times cycle,the capacity of the supercapacitor remained 85% of initial capacity,which had the flexibility performance.