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http://dx.doi.org/10.14478/ace.2015.1056

Synthesis and Electrochemical Characteristics of Mesoporous Silicon/Carbon/CNF Composite Anode  

Park, Ji Yong (Department of Chemical Engineering, Chungbuk National University)
Jung, Min Zy (Department of Chemical Engineering, Chungbuk National University)
Lee, Jong Dae (Department of Chemical Engineering, Chungbuk National University)
Publication Information
Applied Chemistry for Engineering / v.26, no.5, 2015 , pp. 543-548 More about this Journal
Abstract
Si/C/CNF composites as anode materials for lithium-ion batteries were examined to improve the capacity and cycle performance. Si/C/CNF composites were prepared by the fabrication process including the synthesis and magnesiothermic reduction of SBA-15 to obtain Si/MgO by ball milling and the carbonization of phenol resin with CNF and HCl etching. Prepared Si/C/CNF composites were then analysed by BET, XRD, FE-SEM and TGA. Among SBA-15 samples synthesized at reaction temperatures between 50 and $70^{\circ}C$, the SBA-15 at $60^{\circ}C$ showed the largest specific surface area. Also the electrochemical performances of Si/C/CNF composites as an anode electrode were investigated by constant current charge/discharge test, cyclic voltammetry and impedance tests in the electrolyte of LiPF6 dissolved in mixed organic solvents (EC : DMC : EMC = 1 : 1 : 1 vol%). The coin cell using Si/C/CNF composites (Si : CNF = 97 : 3 in weight) showed better capacity (1,947 mAh/g) than that of other composition coin cells. The capacity retention ratio decreased from 84% (Si : CNF = 97 : 3 in weight) to 77% (Si : CNF = 89 : 11 in weight). It was found that the Si/C/CNF composite electrode shows an improved cycling performance and electric conductivity.
Keywords
silicon; carbon nano fiber; SBA-15; anode material; lithium ion battery;
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