TY - JOUR
T1 - Electrochemical characteristics of amorphous silicon thin film electrode with fluoroethylene carbonate additive
AU - Kim, Jung Sub
AU - Byun, Dongjin
AU - Lee, Joong Kee
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) ( NRF-2010-C1AAA001-2010-0028958 ).
PY - 2014/4
Y1 - 2014/4
N2 - The electrochemical and compositional changes of a solid electrolyte interphase (SEI) layer formed on the surface of silicon thin film are investigated in order to determine the effect of the content of fluoroethylene carbonate (FEC) additive in the electrolyte. Comparisons are made with FEC-free electrolyte, in which the major components are (CH2OCO 2Li)2 and Li2CO3. The (CH 2OCO2Li)2 and Li2CO3 of the SEI layer in the FEC-containing electrolyte decreases, and polycarbonate and LiF increase relatively with the repression of -OCO2Li groups. The additive affects the composition of the SEI layer, which leads to lower resistance. The electrochemical performance regarding cycle retention, coulombic efficiency, rate capability, and discharge capacity in the FEC-containing cell are significantly enhanced compared to that of the FEC-free electrolyte. The observed optimum FEC concentration in the electrolyte is 1.5%, due to the reduced charge transfer and SEI resistance in our experimental range.
AB - The electrochemical and compositional changes of a solid electrolyte interphase (SEI) layer formed on the surface of silicon thin film are investigated in order to determine the effect of the content of fluoroethylene carbonate (FEC) additive in the electrolyte. Comparisons are made with FEC-free electrolyte, in which the major components are (CH2OCO 2Li)2 and Li2CO3. The (CH 2OCO2Li)2 and Li2CO3 of the SEI layer in the FEC-containing electrolyte decreases, and polycarbonate and LiF increase relatively with the repression of -OCO2Li groups. The additive affects the composition of the SEI layer, which leads to lower resistance. The electrochemical performance regarding cycle retention, coulombic efficiency, rate capability, and discharge capacity in the FEC-containing cell are significantly enhanced compared to that of the FEC-free electrolyte. The observed optimum FEC concentration in the electrolyte is 1.5%, due to the reduced charge transfer and SEI resistance in our experimental range.
KW - Amorphous materials
KW - Chemical vapor deposition
KW - Interface
KW - Thin films
UR - http://www.scopus.com/inward/record.url?scp=84896784865&partnerID=8YFLogxK
U2 - 10.1016/j.cap.2014.02.008
DO - 10.1016/j.cap.2014.02.008
M3 - Article
AN - SCOPUS:84896784865
VL - 14
SP - 596
EP - 602
JO - Current Applied Physics
JF - Current Applied Physics
SN - 1567-1739
IS - 4
ER -