Journal
ELECTROCHIMICA ACTA
Volume 289, Issue -, Pages 264-271Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.08.088
Keywords
gamma-Fe2O3; Electrospinning; Porous carbon nanofiber; Freestanding anode; Lithium ion batteries
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Funding
- National Research Foundation of Korea [NRF-2017R1A4A1015711]
- Natural Science Foundation of Jiangsu government China [BK20170341, 17KJB430028, BK20161209]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies
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A freestanding gamma-Fe2O3/carbon nanofiber composite as the anode of lithium ion batteries has been prepared with gamma-Fe2O3 nanoparticles aligned in the tubular channels of the nanofibrous carbon matrix. Innovatively, a large amount of voids are generated for confining a very high active mass content by facilely verifying the ratio of carbon source and the sacrificing pore-forming agent, poly( methyl methacrylate). The best electrochemical performance at an active mass ratio of 70% is obtained with a high discharge capacity of 1088 mAh g(-1) retained after 300 cycles at 0.2 C. Good rate capability and long life-span performance are further achieved at 0.5 and 2 C for 600 and 1000 cycles, respectively. In situ X-ray patterns further reveal better exploitation of the active materials for this gamma-Fe2O3/carbon nanofiber composite electrode. The enhanced electrochemical performance of lithium ion batteries can be ascribed to the well-dispersed gamma-Fe2O3 nanoparticles within the porous carbon matrix, as well as the cross-linked fiber morphology. Consequently, this study provides a superior electrode architecture for constructing flexible anodes of high-performance lithium ion batteries. (C) 2018 Elsevier Ltd. All rights reserved.
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