期刊
ELECTROCHIMICA ACTA
卷 187, 期 -, 页码 508-516出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.11.108
关键词
hematite; graphitic carbon-encapsulated nanoparticle; low-temperature catalytic graphitization anode; lithium-ion batteries
资金
- National Innovation Engineering Program for New Energy Vehicle Industry Technology of China
- National 863 Program of China [2013AA050903]
- Beijing Key Laboratory of Environmental Science and Engineering [20131039031]
- Beijing Higher Institution Engineering Research Center for Power Battery and Chemical Energy Materials [20141039017]
A delicate structure of graphitic carbon-encapsulated alpha-Fe2O3 nanocomposite is in situ constructed via Absorption-Catalytic graphitization-Oxidation strategy, taking use of biomass matter of degreasing cotton as carbon precursor and solution reservoir. With the assistance of the catalytic graphitization effect of iron core, onion-like graphitic carbon (GC) shell is made directly from the biomass at low temperature (650 degrees C). The nanosized alpha-Fe2O3 particles would effectively mitigate volumetric strain and shorten Li+ transport path during charge/discharge process. The graphitic carbon shells may promote charge transfer and protect active particles from directly exposing to electrolyte to maintain interfacial stability. As a result, the as-prepared alpha-Fe2O3@ GC composite displays an outstanding cycle performance with a reversible capacity of 1070 mA h g(-1) after 430 cycles at 0.2C, as well as a good rate capability of similar to 950 mA h g(-1) after 100 cycles at 1C and similar to 850 mA h g(-1) even up to 200 cycles at a 2C rate. (C) 2015 Elsevier Ltd. All rights reserved.
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