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N5.04 - Engineering Single Crystalline Mn3O4 Nano-Octahedra with Exposed Highly Active {011} Facets for High Performance Lithium Ion Battery 
April 23, 2014   2:30pm - 2:45pm

Well shaped single crystalline Mn3O4 nano-octahedra with exposed highly active {011} facets with different particle sizes have been synthesized and used as anode material for lithium ion batteries. The nano-octahedra samples demonstrated a much better electrochemical performance in comparison with the irregular Mn3O4 nanoparticles. In particular, the smallest sized Mn3O4 nano-octahedra show the best cycling performance with an initial charge capacity of 907 mA h g-1 and a 50th discharge capacity of 500 mA h g-1 at a current density of 50 mA g-1 with an excellent coulombic efficiency (nearly 100%) and a good rate capability with a charge/discharge capacity of 350 mA h g-1 when cycling at 500 mA g-1. HRTEM and HAADF-STEM have been used to characterize our single crystalline Mn3O4 nano-octahedra. The mechanism for these excellent electrochemical properties has been studied in detail from different aspects such as structure, size effect, crystal shape, surface composition, ions diffusion and active facets. This work reveals that the excellent electrochemical performance is related to the exposed highly active {011} facets which can facilitate the conversion reaction of Mn3O4 and Li due to the alternating Mn and O atom layers, resulting in easy formation and decomposition of the amorphous Li2O and the multi-electron reaction. Moreover, the smallest sized Mn3O4 nano-octahedra contain the largest number of {011} facets, thus more active sites, providing maximum contact with the electrolyte, facilitating the rapid Li-ion diffusion at the electrode/electrolyte interface and fast lithium-ion transportation within the particles, leading finally to the best electrochemical properties among the differently sized Mn3O4 nano-octahedra. The high Li-ion storage capacity and excellent cycling performance suggest that the Mn3O4 nano-octahedra with exposed highly active {011} facets could be an excellent anode material for high-performance lithium-ion batteries.

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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