Journal
ELECTROCHIMICA ACTA
Volume 120, Issue -, Pages 452-459Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.018
Keywords
lithium ion battery; anode; manganese oxide; graphene; doping
Categories
Funding
- Center for Integrated Smart Sensors
- Ministry of Science, ICT AMP
- Future Planning as Global Frontier Project [CISS-2012M3A6A6054193]
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Science, ICT AMP
- Future Planning [2013-053595]
- Korean Ministry of Education, Science, and Technology through Institute of Basic Science (IBS) program
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Developing new electrode materials with high specific capacity for excellent lithium ion storage properties is very desirable. In this paper, we introduce a simple hydrothermal method for the growth of Mn3O4 nanoparticles onto nitrogen-doped graphene (N-doped graphene) for high-performance lithium ion battery (LIB) anodes. Hydrazine plays a fundamental role in the formation of such nanostructures as it can act both as a reducing agent and as a nitrogen source. In the synthesized composite, highly crystalline Mn3O4 nanoparticles with average sizes of 20-50 nm are homogeneously dispersed on both sides of the N-doped graphene. The nitrogen content in the doped graphene is confirmed by elemental analyzer, and 2 wt% of the sample is found to be composed of nitrogen element. The as-prepared Mn3O4/N-doped graphene composites exhibit remarkable electrochemical performance, including high reversible specific capacity, outstanding cycling stability, and excellent rate capability (approximately 400 mA h g(-1) at 2.0 A g(-1)) when used as the anode material for LIBs. The improvement in the electrochemical properties of the material can be attributed to graphene, which acts as both an electron conductor and a volume buffer layer, and nitrogen doping allows for fast electron and ion transfer by decreasing the energy barrier. This type of metal oxide/N-doped graphene composites can be promising candidates for high-performance anode materials for LIBs. (C) 2013 Elsevier Ltd. All rights reserved.
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