混合水溶液K^+超级电容器AC//Na_(0.7)MnO_(2.05)的研究

Research on Hybrid Aqueous K^+ Supercapacitor AC//Na_(0.7)MnO_(2.05)

制备并表征了棒状水钠锰矿Na_(0.7)MnO_(2.05),研究了其在K_2SO_4水溶液中电化学性能和制作成电容器的性能。结果表明:在0.5 M K_2SO_4水溶液中具有优异的高功率性能和循环性能;其和活性炭组成的混合超级电容器在400 W/kg和2.18 k W/kg的功率密度下,能量密度分别高达18 Wh/kg和14.2 Wh/kg,具有较好的循环性能,在1 A/g的电流密度下,5 000次循环后,电容量还保持有90%。

A rodlike birnessite-type Na0.7MnO2.05 was prepared and characterized, the electrochemical properties and the performance of the capacitor that was assemblied were studied. The results showed that it presented an excellent high power performance and cycling performance in 0.5 M K2SO4 aqueous electrolyte. A hybrid supercapacitor was assembled by activated carbon and Na0.7MnO2.05, a high enery density of 18 Wh/kg, 14.2 Wh/kg could be achieved at the power density of 400 W/kg and 2.18 k W/kg respectively. Moreover, the hybrid supercapacitor displayed a good cycling stability with 90% of capacitance retention after 5 000 cycles at the current density of 1 A/g.