270488 High-Performance Supercapacitor and Li Ion Battery Electrodes Using Novel Ordered Mesoporous Metal Oxide Materials

Tuesday, October 30, 2012: 8:30 AM
307 (Convention Center )
Jinwoo Lee, Department of Chemical Engineering and School of Environmental Science & Engineering, Pohang University of Science and Engineering, Pohang, South Korea

For high performance supercapacitor and Li-ion battery electrodes, various mesoporous metal oxide materials have been synthesized by employing lab-synthesized block copolymers as a structure-directing agent or ordered mesoporous silica materials as hard templates. An ordered mesoporous WO3-X material with high electrical conductivity was employed for use as a supercapacitor electrode in 2.0 M H2SO4. The electrode made of mesoporous WO3-X exhibited a high rate capability and an excellent capacitance (366 mFcm-2, 639 Fcm-3), which were attributed to the large ordered mesopores, high electrical conductivity, and high material density. Fe3O4 nanocrystals confined in mesocellular carbon foam (MSU-F-C) are synthesized by ‘Host-Guest’ approach and tested as anode for lithium-ion batteries (LIBs). 13-27 nm magnetite Fe3O4 nanocrystals are formed inside ~30 nm pores of mesocellular carbon matrix. Fe3O4/MSU-F-C (45 wt% Fe3O4) exhibited 1007 mA h g-1 of first charge (Li de-insertion) capacity at 0.1 A g-1 and 111% of capacity retention at 150th cycle, and retains 37% capacity at 7 A g-1 (~7 C rate). For the first time, we synthesized mesostructured LTO/carbon composite (Lithium titanate/carbon) with large (> 15 nm) and uniform pores for high performance LIB anodes via a block copolymer assembly. The electrochemical characterization of this material will be presented.

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See more of this Session: Nanomaterials for Energy Storage I
See more of this Group/Topical: Topical 5: Nanomaterials for Energy Applications