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- Touja, Justine, et al.
(författare)
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Self-supported carbon nanofibers as negative electrodes for K-ion batteries: Performance and mechanism
- 2020
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Ingår i: Electrochimica Acta. - : Elsevier BV. - 0013-4686. ; 362
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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