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Hur, Jae Woong
다차원 탄소재료 연구단
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Amorphous Si1-yCy composite anode materials: ab initio molecular dynamics for behaviors of Li and Na in the framework

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Title
Amorphous Si1-yCy composite anode materials: ab initio molecular dynamics for behaviors of Li and Na in the framework
Author(s)
Jaewoong Hur
Subject
SODIUM-ION, ; NEGATIVE ELECTRODES, ; 1ST PRINCIPLES, ; LITHIUM, ; SILICON, ; 1ST-PRINCIPLES, ; STORAGE, ; CARBON, ; ELECTROCHEMISTRY, ; ENHANCEMENT
Publication Date
2021-03-07
Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.23, no.9, pp.5571 - 5577
Publisher
ROYAL SOC CHEMISTRY
Abstract
Although amorphous Si/C composite anode materials with various types of nanostructures Si/C materials have been experimentally proposed for rechargeable ion batteries for their structural durability, the atomistic mechanism primarily suggesting Li and Na monovalent ion intercalation into an amorphous Si/C composite matrix has not theoretically been understood to explore the thermodynamic and kinetic features of the a-Si/C composite phase regarding the effects on the carbon addition to an amorphous Si matrix. In this work, systematic ab initio molecular dynamics calculations (AIMDs) were conducted to identify electrochemical intercalation reactions involved in nanostructure evolutions, which correspond to favorable ion-intercalated formations, volume expansions, pair correlations, charge transfers, and diffusion behaviors of metals in a-MxSi1-yCy (M-x: Li-x and Na-x) alloys with increasing x contents of atomic concentrations. AIMDs using the a-Si1-yCy composite phase might allow one to have an atomic-level understanding of the composite phase and further insightful comprehension of any implementations such as the controlled ratio of the Si1-yCy composite and multivalent ions inserted into the framework.
URI
https://pr.ibs.re.kr/handle/8788114/9461
DOI
10.1039/d0cp05934j
ISSN
1463-9076
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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