A high energy and power density hybrid supercapacitor based on an advanced carbon-coated Li4Ti5O12 electrode

We describe in this work the synthesis and the characterization of homogeneous, carbon-coated lithium titanium oxide micro spheres and demonstrate their use for the fabrication of an active negative electrode combined with a high surface area, activated carbon positive electrode to form an advanced non aqueous, hybrid supercapacitor. We show that this activated carbon/carbon coated-Li4Ti5O12 device retains 95% of its initial capacity after 1000 cycles with a maximum volumetric energy and power density of 57 Wh L-1 and 2600 W L-1, respectively. Due to this unique performance, the hybrid supercapacitor developed in this work is expected to be a very promising energy storage device suitable for applications that require high energy levels and fast charge and discharge cycles, such as those requested in the EV sector. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.