Potassium-ion storage behavior of microstructure-engineered hard carbons

The staging of potassium-ion intercalation reactions with graphite-like carbon materials has been previously chronicled; however, the potassium-ion storage behavior of disordered graphitic carbons (DGCs) has not been elucidated owing to their complex microstructures and the lack of systematic studie...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 1; no. 4; pp. 255 - 263
Main Authors Kim, Hoseong, Hyun, Jong Chan, Jung, Ji In, Lee, Jin Bae, Choi, Jaewon, Cho, Se Youn, Jin, Hyoung-Joon, Yun, Young Soo
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 25.01.2022
Subjects
Anode effect
Electrode materials
Graphitic structure
High temperature
Intercalation
Ion storage
Lattices
Lithium
Lithium ions
Microstructure
Natural polymers
Polymers
Potassium
Pyrolysis
Rechargeable batteries
Storage
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Summary:The staging of potassium-ion intercalation reactions with graphite-like carbon materials has been previously chronicled; however, the potassium-ion storage behavior of disordered graphitic carbons (DGCs) has not been elucidated owing to their complex microstructures and the lack of systematic studies. In this study, microstructure-engineered DGCs were prepared using natural polymers by simple pyrolysis, followed by high-temperature annealing from 1200 °C to 2800 °C, and their potassium-ion storage properties were investigated and compared with their lithium-ion storage characteristics. In contrast to the lithium-ion intercalation reactions, which are dependent on local graphitic ordering, the stage I potassium-ion intercalation reaction was found to occur in highly disordered graphitic structures with a few nanometer-sized graphitic domains and an expanded d -spacing of >3.5 Å. In addition, the potassium-ion intercalation reactions with the highly expanded graphitic lattices were considerably faster and more stable compared to those with the highly developed disordered graphitic structures. These results suggest that hard carbons with a loosely packed disordered graphitic structure can be employed as effective high-performance anode materials for potassium-ion batteries. A distinctive solid-solution potassium-ion intercalation behavior of disordered graphitic carbon materials was observed.
Bibliography:10.1039/d1ta08981a
Electronic supplementary information (ESI) available. See DOI
ISSN:2050-7488
2050-7496
DOI:10.1039/d1ta08981a