Self-supported carbon nanofibers as negative electrodes for K-ion batteries: Performance and mechanism
Journal article, 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.
Self-supported electrode
Carbon nanofibers
K-ion batteries
Solid electrolyte interphase
K+ storage mechanism
Author
Justine Touja
University of Montpellier
Centre national de la recherche scientifique (CNRS)
Vincent Gabaudan
University of Montpellier
Centre national de la recherche scientifique (CNRS)
Filippo Farina
University of Montpellier
Sara Cavaliere
Institut Universitaire de France
University of 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, Physics, Materials Physics
Joachim Wallenstein
Chalmers, Physics, Materials Physics
Patrik Johansson
Chalmers, Physics, Materials Physics
Lorenzo Stievano
University of Montpellier
Centre national de la recherche scientifique (CNRS)
Alistore - European Research Institute
Laure Monconduit
Alistore - European Research Institute
University of Montpellier
Centre national de la recherche scientifique (CNRS)
Electrochimica Acta
0013-4686 (ISSN)
Vol. 362 137125Subject Categories
Inorganic Chemistry
Materials Chemistry
Other Chemical Engineering
Other Physics Topics
DOI
10.1016/j.electacta.2020.137125