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

리튬이차전지용 Hollow Silicon/Carbon 음극소재의 전기화학적 성능

  • Jung, Min Ji (Department of Chemical Engineering, Chungbuk National University) ;
  • Lee, Jong Dae (Department of Chemical Engineering, Chungbuk National University)
  • Received : 2016.06.11
  • Accepted : 2016.06.26
  • Published : 2016.08.10

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.

Acknowledgement

Supported by : 연구개발특구진흥재단

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