Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 24, Pages 8997-9003Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.07.136
Keywords
Electrolyte additive; Si thin film electrode; Tris(pentafluorophenyl) borane (TPFPB); Solid-electrolyte interphase (SEI)
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Funding
- MKE/IITA (Core Lithium Secondary Battery Anode Materials for Next Generation Mobile Power Module) [2008-F-019-01]
- National Research Foundation of Korea
- Korean Government (MEST) [NRF-2009-0094219]
- National Research Foundation of Korea [과C6A1907] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We report tris(pentafluorophenyl) borane (TPFPB) as a novel electrolyte additive for silicon (Si) thin film anodes in lithium ion batteries. The introduction of TPFPB into the electrolyte consisting of 1 M lithium perchlorate (LiClO4) in ethylene carbonate (EC)/diethyl carbonate (DEC) (1/1 volume) significantly enhances the capacity retention and coulombic efficiency. Specifically, TPFPB enables the improved properties by forming stable solid-electrolyte interphase (SEI) layers and suppressing surface pulverization. The SEI layers are thoroughly characterized by a variety of analytical tools including scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (X PS). (C) 2011 Elsevier Ltd. All rights reserved.
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