Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
UNCORRECTED PROOF
Effect of Crystallinity of Synthetic Graphite on Electrochemical Potassium Intercalation into Graphite
Daisuke IGARASHIKei KUBOTATomooki HOSAKARyoichi TATARATsuyoshi INOSEYuji ITOHirofumi INOUEMasataka TAKEUCHIShinichi KOMABA
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JOURNALS OPEN ACCESS Advance online publication
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Article ID: 21-00062

UNCORRECTED PROOF: July 15, 2021
ACCEPTED MANUSCRIPT: June 24, 2021
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Abstract

An effect of crystallinity of graphite on formation of graphite intercalated compounds (GICs) and reversibility in K cells was studied by comparing that of lithium-ion batteries. Though high reversible capacities and coulombic efficiencies of graphite electrodes in K cells were achieved during initial cycles regardless of the crystallinity, high crystallinity graphite demonstrated less potential-hysteresis and superior capacity retention to low crystallinity graphite. Operando XRD measurement confirmed similar staging process of K-GICs for both graphite, however, high crystallinity graphite was transformed into higher crystallinity of K-GIC as well as higher reversibility of potassium de-/intercalation than low crystallinity graphite. A turbostratic disorder in low crystallinity graphite led to redox-potential split and lower crystalline K-GIC and potassium-extracted graphite. Thus, the crystallinity of graphite, which includes coherence length and the degree of random stacking, is found to be a predominant factor for highly reversible potassium intercalation, which differs from the lithium case. We concluded that the high crystallinity is of importance for the application of graphite to long-life potassium-ion batteries.

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© The Author(s) 2021. Published by ECSJ.

This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial Share Alike 4.0 License (CC BY-NC-SA, http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium by share-alike, provided the original work is properly cited. For permission for commercial reuse, please email to the corresponding author. [DOI: 10.5796/electrochemistry.21-00062].
http://creativecommons.org/licenses/by-nc-sa/4.0/
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