期刊
JOURNAL OF POWER SOURCES
卷 175, 期 1, 页码 540-546出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2007.08.065
关键词
graphite negative electrode; propylene carbonate; lithium intercalation; atomic force microscopy; surface film
This study examines the electrochemical reactions occurring at graphite negative electrodes of lithium-ion batteries in a propylene carbonate (PC) electrolyte that contains different concentrations of lithium salts such as, LiClO4, LiPF6 or LiN(SO2C2F5)(2). The electrode reactions are significantly affected by the electrolyte concentration. In concentrated solutions, lithium ions are reversibly intercalated within the graphite to form stage I lithium-graphite intercalation compounds (Li-GICs), regardless of the lithium salt used. On the other hand, electrolyte decomposition and exfoliation of the graphene layers occur continuously in the low-concentration range. In situ analysis with atomic force microscopy reveals that a thin film (thickness of similar to 8 nm) forms on the graphite surface in a concentrated solution, e.g., 3.27 mol kg(-1) LiN(SO2C2F5)(2)/PC, after the first potential cycle between 2.9 and 0 V versus Li+/Li. There is no evidence of the co-intercalation of solvent molecules in the concentrated solution. (C) 2007 Published by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据