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http://dx.doi.org/10.14478/ace.2016.1055

Electrochemical Performance of Hollow Silicon/Carbon Anode Materials for Lithium Ion Battery  

Jung, Min Ji (Department of Chemical Engineering, Chungbuk National University)
Lee, Jong Dae (Department of Chemical Engineering, Chungbuk National University)
Publication Information
Applied Chemistry for Engineering / v.27, no.4, 2016 , pp. 444-448 More about this Journal
Abstract
Hollow silicon/carbon (H-Si/C) composites as anode materials for lithium ion batteries were investigated to overcome the large volume expansion. H-Si/C composites were prepared as follows; hollow $SiO_2\;(H-SiO_2)$ was prepared by adding $NaBH_4$ to $SiO_2$ synthesized using $st{\ddot{o}}ber$ method followed by magnesiothermic reduction and carbonization of phenolic resin. The H-Si/C composites were analyzed by XRD, SEM, BET and EDX. To improve the capacity and cycle performance, the electrochemical characteristics of H-Si/C composites synthesized with various $NaBH_4$ contents were investigated by charge/discharge, cycle, cyclic voltammetry and impedance tests. The coin cell using H-Si/C composite ($SiO_2:NaBH_4=1:1$ in weight) in the electrolyte of $LiPF_6$ dissolved in organic solvents (EC : DMC : EMC = 1 : 1 : 1 vol%) has better capacity (1459 mAh/g) than those of other composition coin cells. It is found that the coin cell ($SiO_2:NaBH_4=1:1$ in weight) has an excellent capacity retention from 2nd cycle to 40th cycle.
Keywords
$st{\ddot{o}}ber$ method; hollow $SiO_2$; $NaBH_4$ etching; Mg reduction; lithium ion battery;
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Times Cited By KSCI : 2  (Citation Analysis)
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