Journal
ELECTROCHIMICA ACTA
Volume 362, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137125
Keywords
K-ion batteries; Self-supported electrode; Carbon nanofibers; K+ storage mechanism; Solid electrolyte interphase
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Funding
- European Research Council under the European Union's Seventh Framework Program (FP/2007-2013)/ERC Grant [306682]
- IUF
- French RS2E Network (RS2E) (STORE -EX Labex Project) [ANR-10-LABX-76-01]
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Self-standing carbon nanofibers (CNF) were electrospun and tested in K-ion batteries (KIP). The comparison of the electrochemical performance of KIP using potassium bis(fluorosulfonyl)imide (KFSI) and potassium hexafluorophosphate (KPF6) carbonate-based electrolytes revealed that, despite the coulombic efficiency is more readily stabilized with KFSI than with KPF6, the long-term cycling is quite the same, with a specific capacity of 200 mAh.g(-1) for the CNF electrode. Post-mortem X-ray photoelectron spectroscopy analysis shows a more stable solid electrolyte interphase (SEI) for KIP employing KFSI. Finally, the K+ ion storage mechanism was investigated by combining cyclic voltammetry and operando Raman spectroscopy, showing a combination of adsorption and intercalation processes. The rate capability is, however, better with the KPF6 salt due to SEI layers formed at both CNF and K metal electrode, highlighting that full cell may lead to even superior results. (C) 2020 Elsevier Ltd. All rights reserved.
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