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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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Subnano-sized silicon anode via crystal growth inhibition mechanism and its application in a prototype battery pack

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Title
Subnano-sized silicon anode via crystal growth inhibition mechanism and its application in a prototype battery pack
Author
Sung, JaekyungKim, NamhyungMa, JiyoungLee, Jeong HyeonJoo, Se HunLee, TaeyongChae, SujongYoon, MoonsuLee, YoonkwangHwang, JaeseongKwak, Sang KyuCho, Jaephil
Issue Date
2021-12
Publisher
NATURE PORTFOLIO
Citation
NATURE ENERGY, v.6, no.12, pp.1164 - 1175
Abstract
Silicon-based anodes are a promising alternative to the graphite anodes that are widely used in today's commercial batteries. Here the authors report a synthesis route for silicon anodes consisting of subnanometre-sized particles and demonstrate their use in an unusual large-scale battery pack system. Due to the large volume variation of high-capacity alloy-based anodes during cycling, it is desirable to use small anode particles for an extended battery cycle life. However, it is still challenging to realize subnano-sized particles (<1 nm). Here we show a growth inhibition mechanism that prevents continuous enlargement of size immediately after nucleation during chemical vapour deposition. The growth inhibition is successfully applied to the synthesis of silicon, thereby yielding subnano-sized (<1 nm) silicon embedded in a highly stable dual matrix composed of carbon and silicon carbide. Ethylene not only functions as a silicon growth inhibitor, thereby slowing the growth of nucleated silicon via Si-C bond formation, but also acts as a source to create the dual matrix. The subnano-sized silicon anode enhances the cycling stability (Coulombic efficiency reaching 99.96% over 50 cycles). Finally, the practical application of the fabricated energy storage system (103.2 kWh) containing 110 Ah full-cells with 91% capacity retention for 2,875 cycles and a calendar life of 97.6% for 1 year is demonstrated.
URI
https://scholarworks.unist.ac.kr/handle/201301/55665
URL
https://www.nature.com/articles/s41560-021-00945-z
DOI
10.1038/s41560-021-00945-z
ISSN
2058-7546
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