1. Title : Design of Electrodes for Electrochemical Energy Storage Devices Using Multiwall Carbon Nanotubes

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2. Speaker : Dr. Seung Woo Lee

3. Date : June 18 (Fri), <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />4:00 P.M.

4. Venue : Building 302, Room 508

5. Abstract

Development of novel energy storage devices using nanoscience and technology has been acknowledged as one of the most important technical issues in the recent energy crisis. Since the efficiency of energy storage devices primarily depends on the materials and structures utilized, both synthesizing unique nanomaterials and designing ideal nanostructures are essential to this research. Potential advantages of nanostructured electrodes for batteries and supercapacitors include higher electrode/electrolyte contact area and faster charge/discharge rates, ultimately leading to higher energy and power density of devices. Layer-by-layer (LBL) assembly is a versatile thin-film fabrication technique which consists of the repeated, sequential immersion of a substrate into aqueous solutions of complementary functionalized materials. We recently demonstrated all multiwall carbon nanotube (MWNT) thin electrodes using LBL assembly with functionalized MWNTs. The LBL assembled MWNT electrodes are unique in that they yield distinct advantages such as 1) water based or “green” electrode processing at ambient conditions, 2) elimination of polymeric/insulating binding agents, surfactants and electronic carbon supports, and 3) precise control of electrode thickness. In addition, the LBL method can be adapted to virtually any 2D, 3D, or flexible substrate to increase electrode surface area for increased energy and power. LBL assembled functionalized MWNT electrodes exhibit a high energy density (200 Wh/kg) delivered at a high power of 100 kW/kg in lithium nonaqueous cells. The high energy densities of LBL-MWNT electrodes can be attributed to the Faradaic reactions between lithium ions and surface functional groups on MWNT electrodes rendering high pseudocapacitance.

6. Contact : Prof. Kookheon Char (☏880-7431)