Self-assembled porous MoO2/graphene microspheres towards high performance anodes for lithium ion batteries

Title
Self-assembled porous MoO2/graphene microspheres towards high performance anodes for lithium ion batteries
Authors
김한수
Keywords
Molybdenum oxide; Self-assembly; Graphene; Anode; Hybrid nanostructure; Lithium ion battery
Issue Date
2015-01
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v. 275, Page. 351-361
Abstract
Three dimensional (3D) porous self-assembled MoO2/graphene microspheres are successfully synthesized via microwave-assisted hydrothermal process in a short reaction time followed by thermal annealing. Such rationally designed multifunctional hybrid nanostructure is constructed from interconnected MoO2 nanoparticles (3-5 nm), which is self-assembled into ordered nanoporous microspheres via strong electrostatic attraction between graphene sheets and MoO2 nanoparticles. The MoO2/graphene hybrid structure delivers a high reversible capacity with significantly enhanced cycling stability (similar to 1300 mAh g(-1) after 80 cycles at C/10 rate) and excellent rate capability (913 and 390 mAh g(-1) at 2C and 5C rates, respectively), when used as an anode material. The microspheres are interconnected and well encapsulated by the flexible graphene sheets, which not only accommodates large volume change but also increases the electrical conductivity of the hybrid structure. Moreover, nanoporous voids present in the 3D framework facilitate effective electrolyte penetration and make a direct contact with the active MoO2 nanoparticles, thereby greatly enhancing lithium ion transport. The strategic combination of selfassembly, nanoporous voids, 3D network and intriguing properties of graphene sheets provides excellent electrochemical performance as anode materials for Lithium ion battery applications. (C) 2014 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11754/21471http://www.sciencedirect.com/science/article/pii/S0378775314018278
ISSN
0378-7753
DOI
http://dx.doi.org/10.1016/j.jpowsour.2014.11.001
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > DEPARTMENT OF ENERGY ENGINEERING(에너지공학과) > Articles
COLLEGE OF ENGINEERING[S](공과대학) > DEPARTMENT OF ENERGY ENGINEERING(에너지공학과) > Articles
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