Authors: Arenst Andreas Arie Hans Kristianto Martin Halim Joong Kee Lee
Publish Date: 2016/12/24
Volume: 21, Issue: 5, Pages: 1331-1342
Abstract
Lithium ion capacitor LIC is a novel hybrid capacitor technology that possesses a better performance than the conventional supercapacitor such as EDLC and lithium ion battery However the overall performance of LIC is limited by activated carbon’s capacity as its cathode This work is focused on synthesize of activated carbon from Indonesian local orange peel waste for LIC cathode and its modification to perform a good electrochemical performances Activated carbon was synthesized by ZnCl2 as impregnant with mass ratio of orange peel to ZnCl2 12 for 1 h at 500 °C The obtained activated carbon possessed large surface area 1200 m2 g −1 higher than commercial activated carbon Merckpa with surface area of 7756 m2 g−1 Modification was done using wet oxidation method by utilizing HNO3 65 H2SO4 98 and H2O2 30 with ratio 11 w/w Electrochemical properties were studied by using half cell test pouch with Li metal as reference electrode and 1 M LiPF6 ECEMCDMC = 111 as electrolyte Modification had successfully increased oxygen atoms in activated carbon samples Surfacemodified cells demonstrated a higher capacitance almost twice in the galvanostatic test than that of the unmodifed one due to the pseudocapacitance effect of oxygen functional groups However its electrochemical performance was unstable The unmodified cell showed a stable performance with 563 F g−1 at current density of 03 mA g−1 and voltage window 25–4 VThis work was a part of the Korea Institute of Science and Technology KIST Institutional Program under the IRDA Alumnae Cooperation Project between KIST and Parahyangan Catholic University The authors are immensely grateful for this financial support
Keywords: