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OO7.03 - Graphene-Based Composites as High Performance Anode for Lithium Ion Batteries 
April 22, 2014   4:15pm - 4:30pm

Well-design of nanostructures has been emerging a promising approach for the lithium ion batteries (LIBs) to achieve higher capacities, better rate capabilities and improved cyclic performances. Metal alloys and sulfides are promising materials for energy storage and conversion devices. Moreover, recent progress of graphene and surface functionalization to make its hybrids with described above materials revolutionize the applications in LIBs. Here, we synthesized different types of graphene (reduced graphene oxide, graphene, nitrogen and phosphorous doped graphene) 1 and their composites with different types of metal alloys and sulfides like SnS2-rGO,2 Co3S4-G,3 Ni3S4-NG, NiS1.03-NG,4,5 Co2SnO4-NG and Co3Sn2@Co-NG6 for their application as anode electrode in LIBs. To overcome the problem of electrode pulverization, two different strategies were utilized. One is the encapsulation of NPs in elastically strong graphene matrix and the second one is sealing out the NPs in the shell of inactive metal and then wrapped by graphene. The high performance of the composites is attributed to the synergistic effect between graphene and NPs. Because of its high surface area, graphene can provide large contact area between the electrolyte and electrode for better performance. In addition, because of the high conductivity and ions transfer mobility, graphene maintains the fast electrical flow of the composites. Further enhancement in electrochemical properties of graphene is carried out by doping of heteroatom in graphitic planes of graphene. All these composites possess extraordinary performances as anode in LIBs. It is worth noting that Ni3S4-NG and Co3Sn2@Co-NG composites displayed 98.87% and 102% capacity retention with a discharge capacity of 1323.2 and 1615 mAh/g after 100th cycle, respectively. These strategies to combine the different property-enhancing factors with engineered structures will bring the realization of graphene-based nanocomposites in the energy storageReferences1. Zhang, C.; Mahmood, N.; Yin, H.; Liu, F.; Hou, Y., Adv Mater 2013, 25, 4932-4937.2. Jiang, J.; Feng,Y.; Mahmood, N.; Liu, F.; Hou, Y., Sci. Adv. Mater., 2013, 5, 1667-1675. 3. Mahmood, N.; Zhang, C.; Jiang, J.; Liu, F.; Hou, Y., Chem. Eur. J. 2013, 19, 5183-5190.4. Mahmood, N.; Zhang, C.; Yin, H.; Hou, Y., J. Mater. Chem. A 2013. DOI: 10.1039/C3TA13033A.5. Mahmood, N.; Zhang, C.; Hou, Y., Small 2013, 9, 1321-1328.6. Mahmood, N.; Zhang, C.; Liu, F.; Jinghan, Z.; Hou, Y., ACS Nano 2013. DOI: 10.1021/nn4047138.

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Keynote Address
Panel Discussion - Different Approaches to Commercializing Materials Research
Business Challenges to Starting a Materials-Based Company
Fred Kavli Distinguished Lectureship in Nanoscience
Application of In-situ X-ray Absorption, Emission and Powder Diffraction Studies in Nanomaterials Research - From the Design of an In-situ Experiment to Data Analysis