High-performance solid-solution potassium-ion intercalation mechanism of multilayered turbostratic graphene nanosheets
- Authors
- Um, Jiae; Yoon, Seung Uk; Kim, Hoseong; Youn, Beom Sik; Jin, Hyoung-Joon; Lim, Hyung-Kyu; Yun, Young Soo
- Issue Date
- 4월-2022
- Publisher
- ELSEVIER
- Keywords
- Turbostratic graphite; Graphene nanosheet; Defective carbon; Anode; Potassium-ion batteries
- Citation
- JOURNAL OF ENERGY CHEMISTRY, v.67, pp.814 - 823
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ENERGY CHEMISTRY
- Volume
- 67
- Start Page
- 814
- End Page
- 823
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/141871
- DOI
- 10.1016/j.jechem.2021.11.027
- ISSN
- 2095-4956
- Abstract
- The solid-solution reaction between an alkali cation and an active host material is known as a single-phase redox mechanism, and it is typically accompanied by a continuous voltage change. It is distinct from the typical alkali cation intercalation reaction at an equivalent site of the active host material, which exhibits a voltage plateau. Herein, we report an unusual solid-solution potassium-ion intercalation mechanism with a low-voltage plateau capacity on multilayered turbostratic graphene nanosheets (T-GNSs). Despite the disordered graphitic structure with a broad range of d-spacings (3.65-4.18 angstrom), the T-GNSs showed a reversible plateau capacity of similar to 200 mA h g(-1), which is higher than that of a well-ordered graphite nanoplate (similar to 120 mA h g(-1)). In addition, a sloping capacity of similar to 220 mA h g(-1) was delivered with the plateau capacity, and higher rate capabilities, better reversibility, and a more stable cycling performance were confirmed on the turbostratic microstructure. First-principles calculations suggest that the multitudinous lattice domains of the T-GNSs contain diverse intercalation sites with strong binding energies, which could be the origin of the high-performance solid-solution potassium-ion intercalation behavior when the turbostratic graphene stacks have a d-spacing smaller than that of equilibrium potassium-graphite intercalation compounds (5.35 angstrom). (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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