A new asymmetric supercapacitor based on lambda-MnO2 and activated carbon electrodes

作者：Xue Yun; Chen Ye^*; Zhang Mi Lin; Yan Yong De

来源：Materials Letters, 2008, 62(23): 3884-3886.

DOI：10.1016/j.matlet.2008.05.014

• crystal structure
• X-ray techniques
• X-MnO2
• asymmetrical supercapacitor
• activated carbon
• aqueous electrolyte

Lithium-ion intercalated compound lambda-MnO2 was used as positive electrode in asymmetric supercapacitor with activated carbon used as negative electrode in 1 mol L-1 Li2SO4 aqueous electrolyte solution. Phase composition, morphology and particle sizes of lambda-MnO2 were studied by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrochemical capacitive performance of the asymmetric supercapacitor was tested by cyclic voltarnmetry and galvanostatic charge-discharge tests. The results show that the asymmetric supercapacitor has electrochemical capacitance performance within wide potential range of 0-2.2 V. The specific capacitance is 53 F g(-1) at a constant current density of 10 mA cm(-2). The energy density is 36 W h kg(-1) with a power density of 314 W kg(-1) is obvious that X-MnC is a potential electrode material for asymmetric supercapacitor.

• 出版日期2008-8-31
• 单位哈尔滨工程大学