Electrochemical characteristics of amorphous silicon thin film electrode with fluoroethylene carbonate additive

Title
Electrochemical characteristics of amorphous silicon thin film electrode with fluoroethylene carbonate additive
Authors
김정섭Dongjn Byun이중기
Keywords
Amorphous materials; Chemical vapor deposition; Interface; Thin films
Issue Date
2014-04
Publisher
Current applied physics
Citation
VOL 14, NO 4, 596-602
Abstract
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 (CH2OCO2Li)2 and Li2CO3. The (CH2OCO2Li)2 and Li2CO3 of the SEI layer in the FEC-containing electrolyte decreases, and polycarbonate and LiF increase relatively with the repression of eOCO2Li 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.
URI
http://pubs.kist.re.kr/handle/201004/47342
ISSN
15671739
Appears in Collections:
KIST Publication > Article
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