期刊
ELECTROCHIMICA ACTA
卷 259, 期 -, 页码 949-954出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.11.018
关键词
Li-ion batteries; Lithium bis(fluorosulfonyl) imide; Lithium hexafluorophosphate; Graphite; Solid electrolyte interphase
资金
- Ministry of Education, Science and Technology
- National Research Foundation of Korea through the Human Resource Training Project for Regional Innovation [2015035858]
While lithium bis(fluorosulfonyl) imide (LiFSI) is widely used in current Li-ion batteries (LIBs), the role of LiFSI in the LIB performance remains elusive. We herein elucidate the effects of LiFSI on the electrochemical performance of graphite anodes in comparison with those of lithium hexafluorophosphate (LiPF6). An in-depth electrochemical analysis using graphite/Li half cells and graphite/graphite symmetric cells confirms that LiFSI provides little improvement to the cyclability of the graphite anode at 25 degrees C, but enables far better performance in cycle and storage tests at 60 degrees C. The superior thermal stability of the graphite anode in LiFSI electrolyte is attributed to the formation of a thin, inorganic-rich solid electrolyte interphase (SEI) layer as indicated by differential scanning calorimetry (DSC) and X-ray photoelectron spectroscopy (XPS) measurements. (C) 2017 Elsevier Ltd. All rights reserved.
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