Open AccessElectrochemical Performance of Hollow Silicon/Carbon Anode Materials for Lithium Ion Battery
Author(s) -
Min Ji Jung,
Jong Dae Lee
Publication year - 2016
Publication title -
applied chemistry for engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.144
H-Index - 11
eISSN - 2288-4505
pISSN - 1225-0112
DOI - 10.14478/ace.2016.1055
Subject(s) - anode , electrochemistry , silicon , cyclic voltammetry , lithium (medication) , carbon fibers , materials science , lithium ion battery , electrolyte , chemical engineering , carbonization , composite number , nuclear chemistry , chemistry , battery (electricity) , composite material , electrode , scanning electron microscope , metallurgy , medicine , power (physics) , physics , engineering , endocrinology , quantum mechanics
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 SiO2 (H-SiO2) was prepared by adding NaBH4 to SiO2 synthesized using stӧber 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 NaBH4 contents were investigated by charge/discharge, cycle, cyclic voltammetry and impedance tests. The coin cell using H-Si/C composite (SiO2 : NaBH4 = 1 : 1 in weight) in the electrolyte of LiPF6 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 (SiO2 : NaBH4 = 1 : 1 in weight) has an excellent capacity retention from 2nd cycle to 40th cycle.
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