Towards all solid state supercapacitors with novel polymer electrolyte and carbon coated manganese oxide electrodes

• Main Author: Lee, Chee Siang.
• Other Authors: Christian Leo Kloc
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Materials::Microelectronics and semiconductor materials
• Online Access: http://hdl.handle.net/10356/44036
• Institution: Nanyang Technological University

Fabrication of simple polymer electrolytes made by PVDF impregnated with liquid organic electrolyte solution and PSS:H polyelectrolyte and used as solid polymer electrolyte in flexible capacitor device were demonstrated. An electrical double layer capacitance as high as 57.70 Fg-1 with CNT paper electrodes in such device was achieved with PVDF impregnated with 1 M LiPF6 battery solution. Besides demonstration of polymer electrolyte in all-solid flexible capacitor device, investigation on the duration in the hydrothermal synthesis of MnO2 and 1-step synthesis of carbon coating on manganese oxide material is carried out in order to improve the performance of MnO2, which is a potential candidate as electrode material in all-solid flexible capacitor device. Results show that with MnO2 and carbon coated manganese oxide sample obtained with heating duration of 45 minutes give better result than other samples with longer heating duration due to the amorphous structure of these samples. Synthesis of carbon coating MnO2 by adding glucose into MnSO4 and KMnO4 in hydrothermal reaction was failed, and Mn3O4 and MnCO3 which consist of Mn2+ and Mn3+ ions were synthesized due to the present of glucose as reducing agent. Nevertheless, the possibility of these samples to be used as supercapacitor material were still investigated and it proved that MnO2 is the most suitable form of pseudocapacitive material most probably due to the Mn4+ ion present.