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


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

DC Field Value Language Sung, Jaekyung ko Kim, Namhyung ko Ma, Jiyoung ko Lee, Jeong Hyeon ko Joo, Se Hun ko Lee, Taeyong ko Chae, Sujong ko Yoon, Moonsu ko Lee, Yoonkwang ko Hwang, Jaeseong ko Kwak, Sang Kyu ko Cho, Jaephil ko 2021-12-31T00:09:43Z - 2021-12-24 ko 2021-12 ko
dc.identifier.citation NATURE ENERGY, v.6, no.12, pp.1164 - 1175 ko
dc.identifier.issn 2058-7546 ko
dc.identifier.uri -
dc.description.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. ko
dc.language 영어 ko
dc.publisher NATURE PORTFOLIO ko
dc.title Subnano-sized silicon anode via crystal growth inhibition mechanism and its application in a prototype battery pack ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85121024292 ko
dc.identifier.wosid 000729687900001 ko
dc.type.rims ART ko
dc.identifier.doi 10.1038/s41560-021-00945-z ko
dc.identifier.url ko
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