Nanoporous LiMn2O4 spinel prepared at low temperature as cathode material for aqueous supercapacitors

• Published in: Journal of power sources Vol. 242; pp. 560 - 565
• Main Authors: Wang, F.X., Xiao, S.Y., Gao, X.W., Zhu, Y.S., Zhang, H.P., Wu, Y.P., Holze, R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.2013; Elsevier
• Subjects: Applied sciences; Aqueous electrolyte; Capacitance; Capacitors; Capacitors. Resistors. Filters; Cathodes; Electrical engineering. Electrical power engineering; Exact sciences and technology; Hydrothermal method; LiMn2O4 spinel; Materials; Nanoporous; Nanostructure; Precursors; Spinel; Supercapacitors; Surface area; Various equipment and components; Supercapacitors; Hydrothermal method; Aqueous electrolyte; LiMn2O4 spinel; Nanoporous; Ternary compound; Cathode; Lithium Oxides; Nanoporous materials; Electrolytic capacitor; Electrode material; O; Hydrothermal growth; spinel; Hydrothermal synthesis; Aqueous medium; Spinels; Preparation; Supercapacitor; Manganese Oxides; LiMn; Lithium Manganites; Aqueous solution; Low temperature
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2013.05.115

LiMn2O4 spinel was prepared by a hydrothermal method using α-MnO2 nanotubes as precursor at 180 °C, a temperature much lower than that in previously reported methods. It is nanoporous with a pore size of about 40–50 nm and a BET surface area of 9.76 m2 g−1. It exhibits a high specific capacitance of 189 F g−1 at 0.3 A g−1 as a cathode for an aqueous supercapacitor. Even at 12 A g−1, it still has a capacitance of 166 F g−1. After 1500 cycles, there is no evident capacity fading. The LiMn2O4 cathode can deliver an energy density of 31.9 Wh kg−1 at 3480 W kg−1 and even maintain 19.4 Wh kg−1 at about 5100 W kg−1 based on the mass of LiMn2O4. •A nanoporous LiMn2O4 spinel was prepared by a hydrothermal method at a very low temperature 180 °C.•Its electrochemical performance as cathode for aqueous supercapacitors was studied.•Its specific capacitance is 189 F g−1 at 0.3 A g−1 and 166 F g−1 at 12 A g−1, and energy density of 19.4 Wh kg−1 at 5100 W kg−1.•At the current density of 12 A g−1 it presents excellent cycling performance.