Studies of interfacial reactions on thin film electrodes of Sn during initial cycling using infrared spectroscopy
- Authors
- Baek, Seung Won; Hong, Sung-June; Kim, Dong Won; Song, Seung-Wan
- Issue Date
- Apr-2009
- Publisher
- ELSEVIER
- Keywords
- Interfacial reaction; Sn; Initial cycling; Ex-situ ATR FTIR
- Citation
- JOURNAL OF POWER SOURCES, v.189, no.1, pp.660 - 664
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 189
- Number
- 1
- Start Page
- 660
- End Page
- 664
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/176988
- DOI
- 10.1016/j.jpowsour.2008.09.035
- ISSN
- 0378-7753
- Abstract
- Interfacial reactions of Sn during initial cycling in 1 M LiPF6/EC:DMC (1:1) were studied by characterizing the surface species formed on thin film electrodes of Sn, prepared with a pulsed laser deposition, using ex-situ ATR FTIR spectroscopy and microscopy. FTIR analyses indicated that at high voltage region above 1.0 V vs. Li/Li+ the surface of Sn electrode was covered by PF-containing inorganic species probably by the interfacial reactions between Sn and PF6- anions. With charging to 0.63 V low amounted organic species with carboxylate metal salt and alkyl functionalities appeared, due to the reductive decomposition of organic solvents. The organic surface species however were destroyed upon a deep charge to 0.1 V and reproduced on the subsequent discharge process, whereas P-F containing inorganic species remained preserved. No sustainment of organic surface species but the stable passivation of Sn surface by PF-containing species during initial cycling are believed to cause unstable interfacial structure and the possibility of reduced utilization of active Sn, respectively, resulting in the large initial irreversible capacity loss.
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