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A simple method of electrochemical lithium intercalation within graphite from a propylene carbonate-based solution

Authors
Jeong, Soon-KiSong, Hee-YoubKim, Seong InAbe, TakeshiJeon, Woo SungYin, Ri-ZhuKim, Yang Soo
Issue Date
Jun-2013
Publisher
Elsevier BV
Keywords
Graphite negative electrode; Propylene carbonate; Solvated lithium ion; Lithium intercalation; Raman spectroscopy
Citation
Electrochemistry Communications, v.31, pp 24 - 27
Pages
4
Journal Title
Electrochemistry Communications
Volume
31
Start Page
24
End Page
27
URI
https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/13676
DOI
10.1016/j.elecom.2013.02.019
ISSN
1388-2481
1873-1902
Abstract
Electrochemical lithium intercalation within graphite from 1 mol dm(-3) solution of LiClO4 in propylene carbonate (PC) was investigated at 25 and -15 degrees C. Lithium ions were intercalated into and de-intercalated from graphite reversibly at -15 degrees C despite the use of pure PC as the solvent. However, ceaseless solvent decomposition and intense exfoliation of graphene layers occurred at 25 degrees C. The results of the Raman spectroscopic analysis indicated that the interaction between PC molecules and lithium ions became weaker at -15 degrees C by chemical exchange effects, which suggested that the thermodynamic stability of the solvated lithium ions was an important factor that determined the formation of a solid electrolyte interface (SEI) in PC-based solutions. Charge-discharge analysis revealed that the nature of the SEI formed at -15 degrees C in 1 mol dm(-3) of LiClO4 in PC was significantly different from that formed at 25 degrees C in 1 mol dm(-3) of LiClO4 in PC containing vinylene carbonate, 3.27 mol kg(-1) of LiClO4 in PC, and 1 mol dm(-3) of LiClO4 in ethylene carbonate. (c) 2013 Elsevier B.V. All rights reserved.
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