Electrochemical performance of carbon-coated lithium manganese silicate for asymmetric hybrid supercapacitors

• Published in: Journal of power sources Vol. 195; no. 11; pp. 3761 - 3764
• Main Authors: Karthikeyan, K., Aravindan, V., Lee, S.B., Jang, I.C., Lim, H.H., Park, G.J., Yoshio, M., Lee, Y.S.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2010; Elsevier
• Subjects: Activated carbon; Alternating current; Applied sciences; Capacitance; Capacitors; Capacitors. Resistors. Filters; Carbon-coated lithium manganese silicate; Current density; Electrical engineering. Electrical power engineering; Electrodes; Exact sciences and technology; Hybrid supercapacitor; Lithium; Nanostructure; Specific energy; Specific power; Supercapacitors; Various equipment and components; Capacitance; Carbon-coated lithium manganese silicate; Specific energy; Specific power; Hybrid supercapacitor; Activated carbon; Supercapacitor; Lithium; Carbon; Coated material; Electrochemical characteristic; Manganese
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2009.11.138

Nanoscale carbon-coated Li 2MnSiO 4 powder is prepared using a conventional solid-state method and can be used as the negative electrode in a Li 2MnSiO 4/activated carbon (AC) hybrid supercapacitor. Carbon-coated Li 2MnSiO 4 material presents a well-developed orthorhombic crystal structure with a P mn2 1 space group, although there is a small impurity of MnO. The maximum specific capacitance of the Li 2MnSiO 4/AC hybrid supercapacitor is 43.2 F g −1 at 1 mA cm −2 current density. The cell delivers a specific energy as high as 54 Wh kg −1 at a specific power of 150 W kg −1 and also exhibits an excellent cycle performance with more than 99% columbic efficiency and the maintenance of 85% of its initial capacitance after 1000 cycles.