121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-624
Subject 3D yolk-shell Si@void@CNF electrodes with enhanced electrochemical performance for lithium-ion batteries
Authors Sojeong Choi, Min-Cheol Kim, Sang-Hyun Moon, Yeon-Kyung Shin, Ji-Eun Lee, Eun-Soo Kim, Kyung-Won Park*
Department of Chemical Engineering, Soongsil University, Korea
Abstract 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 prepared 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 could be controlled by electrospinning with Si powder oxidized at 700 oC under an air atmosphere for a reaction time (x) of 3, 6, and 9 h followed by chemically etching in HF solution. The electrodes were structurally characterized using X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy. The charge/discharge and rate performance of the electrodes was evaluated in the coin-type cells.
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