期刊
JOURNAL OF POWER SOURCES
卷 315, 期 -, 页码 16-22出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.03.022
关键词
Potassium-doped wustite; Hematite; Graphene composite; Anode active materials; Lithium-ion battery
资金
- Mid-career Researcher Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [NRF-2015R1A2A2A04007371]
- Technological innovation R&D program of SMBA [S2177116]
A graphene composite with potassium-doped FeO nanoparticles (K-FeO/graphene) is synthesized by the thermal diffusion of potassium into Fe(2)O(3)fgraphene using polyol reduction. This is applied as anode material in lithium ion batteries in order to enhance the electrochemical performance of conventional iron oxides (hematite or magnetite). Rhombohedral Fe2O3 crystals are transformed into face-centered cubic FeO crystals, which show a broad d-spacing (5.2 angstrom) between their (111) crystal planes, by the calcination of potassium-added Fe2O3/graphene. Because of its structural characteristics, the K-FeO/graphene composite demonstrates an excellent discharge capacity of 1776 mA h g(-1) at the 50th cycle at a current of 100 mA h g(-1) with stable capacity retention. Even with the very high current density of 18.56 A g(-1), its capacity remains at 851 mA h g(-1) after 800 cycles. (C) 2016 Elsevier B.V. All rights reserved.
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