期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 64, 期 -, 页码 344-351出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2018.03.035
关键词
Yolk-shell structure; Si; Anode; Void; Li-ion battery
资金
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT [NRF-2017M1A2A2086648]
- National Research Foundation of Korea [2017M1A2A2086648] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Si-based anode materials are studied to overcome the limitations of high-capacity lithium-ion batteries (LIBs). However, Si-based anodes have critical drawbacks such as volumetric electrode expansion during cycling in LIBs, that result in deterioration in cycling performance. Herein, we prepare 3D yolk-shell Si and carbon nanofiber (CNF) nanostructured electrodes with different void portions (Si@void@CNF-x) using oxidation, etching, and electrospinning process. The portions of the void in the Si@void@CNF electrodes can be controlled by electrospinning with Si powder oxidized at 700 degrees C under an air atmosphere for a reaction time (x) of 3, 6, and 9 h followed by chemically etching in HF solution. The electrodes are structurally characterized using X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. The charge/discharge and rate performance of the electrodes is evaluated in the coin-type cells. Si@void@CNF-6 shows a highest reversible discharge capacity of 304.9 mAh g(-1) at a current density of 200 mA g(-1) after 500 cycles and an improved high rate performance (16618)2000 mA g-1 after 500 cycles), compared to Si@void@CNF-3 and Si@void@CNF-9. The particular void portion in the Si@void@CNF-6 can be responsible for the superior LIB performance, representing the efficiently volumetric expansion-relieved electrode structure during cycling. (C) 2018 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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