Flexible Printed Supercapacitors Based on Nanostructured Materials

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Flexible Printed Supercapacitors Based on Nanostructured Materials Saeed Maleksaeedi1, Bee Yen Tay1, Pooi See Lee2, Foo Khuen Lai1 and Chee Wai Lu1 1 Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075. 2 School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, Nanyang Avenue, Singapore 639798. ABSTRACT With the advent of printed electronics and flexible devices, flexible energy storage has received so much attention in the past few years. In this work, a scalable process for manufacturing of a flexible supercapacitor device based on nanostructured PANI and MnO2 was demonstrated. In this process, nanostructured materials are transformed into form of a printable ink which is applied on a current collector using a simple screen printing method, which can be used in a roll to roll scheme. The flexible device was assembled using a solid polymer electrolyte and the electrochemical performance of the devices was evaluated. A specific capacitance of 120 F/g and 89 F/g for two symmetrical devices based on PANI and MnO2 were obtained respectively. The devices are showing relatively good cyclability and columbic efficiency. INTRODUCTION With ever-increasing usage of portable electronic devices such as hand phones, notebooks, iPods and cameras, the importance of developing new technologies for more efficient energy storage is felt. In the other word, increasing functionality of current portable devices is limited by existing technologies for energy management [1-3]. Conventional batteries cannot provide the peak power demanded without becoming too heavy or bulky. Furthermore, future portable electronic technologies are moving toward light, thin, cheap, and often also flexible solutions, with wearable electronics as one typical application. Many of these issues have been addressed with the advent of “printed electronics”, including printable transistors, RFIDs, light emitting diodes and solar cells [4-7]. However, a complementary energy storage component is still missing [1]. Although there have been reports on flexible batteries and supercapacitors, these are mainly thinned-down versions of conventional devices [2-3,8-9]. Truly printable storage devices that can be easily fabricated using large-scale, solution-based, roll-to-roll processing, while still exhibiting good electrochemical performance, are still demanded. Although there have been plenty of reports on synthesis of new and advanced nanostructured materials for improvement of energy storage capacity and efficiency in batteries and supercapacitors, many of the proposed processing routes are not capable to be scaled up for large production of the device. In some cases, the process is too sophisticated to be efficiently used in a manufacturing line. In some other cases, the material cannot survive the manufacturing process and its property will deteriorate over process or over time. Having said that, many industries on manufacturing of batteries and supercapacitors are still sticking to conventional materi