Self-supported carbon nanofibers as negative electrodes for K-ion batteries: Performance and mechanism
Artikel i vetenskaplig tidskrift, 2020

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.

Solid electrolyte interphase

K+ storage mechanism

K-ion batteries

Carbon nanofibers

Self-supported electrode

Författare

Justine Touja

Centre national de la recherche scientifique (CNRS)

Université de Montpellier

Vincent Gabaudan

Université de Montpellier

Centre national de la recherche scientifique (CNRS)

Filippo Farina

Université de Montpellier

Sara Cavaliere

Institut Universitaire de France

Université de Montpellier

Laure Caracciolo

Centre national de la recherche scientifique (CNRS)

Universite de Pau et des Pays de L'Adour

Lenaic Madec

Centre national de la recherche scientifique (CNRS)

Universite de Pau et des Pays de L'Adour

Herve Martinez

Universite de Pau et des Pays de L'Adour

Centre national de la recherche scientifique (CNRS)

Athmane Boulaoued

Chalmers, Fysik, Materialfysik

Joachim Wallenstein

Chalmers, Fysik, Materialfysik

Patrik Johansson

Chalmers, Fysik, Materialfysik

Lorenzo Stievano

Alistore - European Research Institute

Centre national de la recherche scientifique (CNRS)

Université de Montpellier

Laure Monconduit

Centre national de la recherche scientifique (CNRS)

Université de Montpellier

Alistore - European Research Institute

Electrochimica Acta

0013-4686 (ISSN)

Vol. 362 137125

Ämneskategorier

Oorganisk kemi

Materialkemi

Annan kemiteknik

DOI

10.1016/j.electacta.2020.137125

Mer information

Senast uppdaterat

2021-01-08