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Solvothermal Synthesis of Co3S4/Graphene Nanoassemblies As Anode Materials for Lithium-Ion Batteries

Tuesday, 10 June 2014
Cernobbio Wing (Villa Erba)

ABSTRACT WITHDRAWN

Co3S4/graphene nanoassemblies were synthesized by a facile solvothermal approach, in which bifunctional dimethyl sulfoxide served as both solvent and sulfur-source. Structural characterizations reveal an intimate contact between Co3S4 and graphene matrix. When employed as anode materials for lithium-ion batteries, the Co3S4/graphene nanoassemblies exhibited good electrochemical performance, including a high reversible capacity of 1085 mAh/g,  good cyclability and excellent rate capability. Compared to bare Co3S4 and graphene, the lithium-ion storage performance has been significantly improved. The improved electrochemical performance for reversible lithium-ion storage could be ascribed to the synergistic effects of the Co3S4/graphene nanoassemblies as an integrated hybrid nanoarchitecture, in which graphene nanosheets provide electronic conductivity, serve as the homogeneous dispersive agent and offer buffer layers for the active Co3S4 during lithium-ion insertion and extraction processes.