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Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
Research Interests
  • Molecular modeling and simulation, statistical thermodynamics, molecular physics

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Revealing the Intercalation Mechanisms of Lithium, Sodium, and Potassium in Hard Carbon

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dc.contributor.author Alvin, Stevanus ko
dc.contributor.author Cahyadi, Handi Setiadi ko
dc.contributor.author Hwang, Jieun ko
dc.contributor.author Chang, Wonyoung ko
dc.contributor.author Kwak, Sang Kyu ko
dc.contributor.author Kim, Jaehoon ko
dc.date.available 2020-07-10T00:26:30Z -
dc.date.created 2020-06-29 ko
dc.date.issued 2020-05 ko
dc.identifier.citation ADVANCED ENERGY MATERIALS, v.10, no.20, pp.2000283 ko
dc.identifier.issn 1614-6832 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/33018 -
dc.description.abstract Hard carbon is the most promising anode material for sodium-ion batteries and potassium-ion batteries owing to its high stability, widespread availability, low-cost, and excellent performance. Understanding the carrier-ion storage mechanism is a prerequisite for developing high-performance electrode materials; however, the underlying ion storage mechanism in hard carbon has been a topic of debate because of its complex structure. Herein, it is demonstrated that the Li+-, Na+-, and K+-ion storage mechanisms in hard carbon are based on the adsorption of ions on the surface of active sites (e.g., defects, edges, and residual heteroatoms) in the sloping voltage region, followed by intercalation into the graphitic layers in the low-voltage plateau region. At a low current density of 3 mA g(-1), the graphitic layers of hard carbon are unlocked to permit Li+-ion intercalation, resulting in a plateau region in the lithium-ion batteries. To gain insights into the ion storage mechanism, experimental observations including various ex situ techniques, a constant-current constant-voltage method, and diffusivity measurements are correlated with the theoretical estimation of changes in carbon structures and insertion voltages during ion insertion obtained using the density functional theory. ko
dc.language 영어 ko
dc.publisher WILEY-V C H VERLAG GMBH ko
dc.title Revealing the Intercalation Mechanisms of Lithium, Sodium, and Potassium in Hard Carbon ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85083516886 ko
dc.identifier.wosid 000537791700011 ko
dc.type.rims ART ko
dc.identifier.doi 10.1002/aenm.202000283 ko
dc.identifier.url https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.202000283 ko
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