In situ Raman study on degradation of edge plane graphite negative-electrodes and effects of film-forming additives

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• 作者：Hiroe Nakagawa^a ; Yasuhiro Domi^a ; Takayuki Doi^a ; ^{doi@saci.kyoto-u.ac.jp} ; Manabu Ochida^a ; Sigetaka Tsubouchi^a ; Toshiro Yamanaka^a ; Takeshi Abe^b ; Zempachi Ogumi^a
• 关键词：Graphite ; Edge plane ; Raman spectroscopy ; Lithium-ion battery ; Additives ; Vinylene carbonate
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 May, 2012
• 卷：206
• 期：Complete
• 页码：320-324
• 文件大小：681 K

摘要

Structural changes in the surface of edge plane highly oriented pyrolytic graphite (HOPG) electrodes were studied in ethylene carbonate (EC)-based electrolytes by in situ Raman spectroscopy. The Raman spectra revealed that the surface crystallinity of graphite was significantly lowered by the initial intercalation and de-intercalation reactions of Li⁺. This structural degradation resulted in a sluggish stage transition of Li-GIC in the vicinity of the edge plane in the subsequent potential cycle. On the other hand, when the film-forming additive vinylene carbonate was used in the EC-based electrolyte solution, the crystallinity of the edge plane HOPG was maintained even after potential cycling. In addition, the phase transition of Li-GIC during the 2nd potential cycle proceeded in the same manner as in the initial cycle. Based on the present results, we discuss the suppressive role of film-forming additives on the degradation of the surface structure as it relates to the intercalation mechanism of Li⁺.