A cheap asymmetric supercapacitor with high energy at high power: Activated carbon//K0.27MnO2·0.6H2O
A cheap asymmetric supercapacitor with high energy at high power: Activated carbon//K0.27MnO2·0.6H2O
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DOI：
10.1016/j.jpowsour.2009.10.108
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发表时间：
2010-05
影响因子：
9.2
通讯作者：
Q. Qu;Lei Li;S. Tian;Wenling Guo;Yuping Wu;R. Holze
中科院分区：
文献类型：
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作者：
Q. Qu;Lei Li;S. Tian;Wenling Guo;Yuping Wu;R. Holze
对K0.27MnO2·0.6H2O在k2so4中的电化学行为进行了研究，发现K+离子在晶格中有可逆的插/脱插。制备了一种不对称超级电容器活性炭(AC)/0.5mol - 1K2SO4/K0.27MnO2·0.6H2O，并成功进行了测试。功率密度为140Wkg−1时，能量密度为25.3Whkg−1；同时，在活性电极材料总质量为2kWkg - 1的功率密度下，其能量密度为17.6Whkg - 1，比AC/0.5moll - 1Li2SO4/LiMn2O4的能量密度高，保持了良好的速率行为。此外，这种不对称超级电容器表现出优异的循环性能，而无需从电解质溶液中去除氧气。这可以部分归因于K0.27MnO2·0.6H2O的片层结构的稳定性。这种不对称水性电容器在高功率密度下具有高能量密度，具有广阔的应用前景。
Studies of the electrochemical behavior of K0.27MnO2·0.6H2O in K2SO4show the reversible intercalation/deintercalation of K+-ions in the lattice. An asymmetric supercapacitor activated carbon (AC)/0.5moll−1K2SO4/K0.27MnO2·0.6H2O was assembled and tested successfully. It shows an energy density of 25.3Whkg−1at a power density of 140Wkg−1; at the same time it keeps a very good rate behavior with an energy density of 17.6Whkg−1at a power density of 2kWkg−1based on the total mass of the active electrode materials, which is higher than that of AC/0.5moll−1Li2SO4/LiMn2O4. In addition, this asymmetric supercapacitor shows excellent cycling behavior without the need to remove oxygen from the electrolyte solution. This can be ascribed in part to the stability of the lamellar structure of K0.27MnO2·0.6H2O. This asymmetric aqueous capacitor has great promise for practical applications due to high energy density at high power density.