A high performance Li-ion capacitor constructed with Li4Ti5O12/C hybrid and porous graphene macroform

A Li-ion capacitor (LIC) is constructed with Li4Ti5O12/C hybrid as the negative electrode and 3D porous graphene macroform (PGM) as the positive electrode. After optimizing the mass ratio (m(+)/m(-) of the electrode materials with the value of 2, the as-fabricated LIC delivers a maximum energy density of 72 Wh kg(-1) with the power density of 650 W kg(-1) in a voltage range of 1.0-3.0 V. Furthermore, the energy density of the LIC reaches 40 Wh kg-1 even at a high power density of 8.3 kW kg(-1). More significantly, the LIC exhibits a good cycling stability with the retention of 65% after 1000 cycles at a high current density of 10 A g(-1), suggesting great potential application in energy storage of the LIC. (C) 2015 Elsevier B.V. All rights reserved.