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Unraveling the role of LiFSI electrolyte in the superior performance of graphite anodes for Li-ion batteries

Title
Unraveling the role of LiFSI electrolyte in the superior performance of graphite anodes for Li-ion batteries
Authors
Kang, Sung JinPark, Ki SungPark, Seong HyoLee, Ho Chun
DGIST Authors
Lee, Ho Chun
Issue Date
2018-01
Citation
Electrochimica Acta, 259, 949-954
Type
Article
Article Type
Article
Keywords
AnodesDifferential scanning calorimetryElectric batteriesElectrodesElectrolytesGraphiteIonsLithiumLithium compoundsSolid electrolytesThermodynamic stabilityX ray photoelectron spectroscopyBis(fluorosulfonyl)imideElectrochemical analysisElectrochemical performanceGraphite anodeLithium hexafluorophosphateSolid electrolyte interphaseSolid electrolyte interphase layer (SEI)Storage testsLithium-ion batteries
ISSN
0013-4686
Abstract
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 °C, but enables far better performance in cycle and storage tests at 60 °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. © 2017 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/5607
DOI
10.1016/j.electacta.2017.11.018
Publisher
Elsevier Ltd
Related Researcher
  • Author Lee, Ho Chun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
Files:
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Collection:
Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)1. Journal Articles


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