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Journal of Spectroscopy
Volume 2015, Article ID 323649, 5 pages
http://dx.doi.org/10.1155/2015/323649
Research Article

Raman Spectroscopy for Understanding of Lithium Intercalation into Graphite in Propylene Carbonated-Based Solutions

1Korea Basic Science Institute, Suncheon Center, Suncheon 540-742, Republic of Korea
2Department of Chemical Engineering, Soonchunhyang University, Asan , Chungnam 336-745, Republic of Korea

Received 22 August 2014; Accepted 2 October 2014

Academic Editor: Tifeng Jiao

Copyright © 2015 Yang-Soo Kim and Soon-Ki Jeong. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Electrochemical lithium intercalation within graphite was investigated in propylene carbonate (PC) containing different concentrations, 0.4, 0.9, 1.2, 2.2, 2.8, 3.8, and 4.7 mol dm−3, of lithium perchlorate, LiClO4. Lithium ion was reversibly intercalated into and deintercalated from graphite in 3.8 and 4.7 mol dm−3 solutions despite the use of pure PC as the solvent. However, ceaseless solvent decomposition and intense exfoliation of the graphene layers occurred in other solutions. The results of the Raman spectroscopic analysis indicated that contact ion pairs are present in 3.8 and 4.7 mol dm−3 solutions, which suggested that the presence of contact ion pairs is an important factor that determines the solid electrolyte interphase- (SEI-) forming ability in PC-based electrolytes.