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Oxygen-Containing Functional Groups Regulating the Carbon/Electrolyte Interfacial Properties Toward Enhanced K$^{+}$ Storage

Peng, Y.; Chen, Z. 1; Zhang, R.; Zhou, W.; Gao, P.; Wu, J.; Liu, H.; Liu, J.; Hu, A.; Chen, X.
1 Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST), Karlsruher Institut für Technologie (KIT)


Oxygen-containing functional groups were found to effectively boost the K$^{+}$ storage performance of carbonaceous materials, however, the mechanism behind the performance enhancement remains unclear. Herein, we report higher rate capability and better long-term cycle performance employing oxygen-doped graphite oxide (GO) as the anode material for potassium ion batteries (PIBs), compared to the raw graphite. The in situ Raman spectroscopy elucidates the adsorption-intercalation hybrid K$^{+}$ storage mechanism, assigning the capacity enhancement to be mainly correlated with reversible K$^{+}$ adsorption/desorption at the newly introduced oxygen sites. It is unraveled that the C=O and COOH rather than C-O-C and OH groups contribute to the capacity enhancement. Based on in situ Fourier transform infrared (FT-IR) spectra and in situ electrochemical impedance spectroscopy (EIS), it is found that the oxygen-containing functional groups regulate the components of solid electrolyte interphase (SEI), leading to the formation of highly conductive, intact and robust SEI. Through the systematic investigations, we hereby uncover the K$^{+}$ storage mechanism of GO-based PIB, and establish a clear relationship between the types/contents of oxygen functional groups and the regulated composition of SEI.

Verlagsausgabe §
DOI: 10.5445/IR/1000137730
Veröffentlicht am 23.09.2021
DOI: 10.1007/s40820-021-00722-3
Zitationen: 72
Zitationen: 75
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2311-6706, 2150-5551
KITopen-ID: 1000137730
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Nano-Micro Letters
Verlag SpringerOpen
Band 13
Heft 1
Seiten 192
Nachgewiesen in Web of Science
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