Strong stress-composition coupling in lithium alloy nanoparticles

Hyeon Kook Seo, Jae Yeol Park, Joon Ha Chang, Kyun Sung Dae, Myoung Sub Noh, Sung Soo Kim, Chong-Yun Kang, Kejie Zhao, Sangtae Kim, Jong Min Yuk

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The stress inevitably imposed during electrochemical reactions is expected to fundamentally affect the electrochemistry, phase behavior and morphology of electrodes in service. Here, we show a strong stress-composition coupling in lithium binary alloys during the lithiation of tin-tin oxide core-shell nanoparticles. Using in situ graphene liquid cell electron microscopy imaging, we visualise the generation of a non-uniform composition field in the nanoparticles during lithiation. Stress models based on density functional theory calculations show that the composition gradient is proportional to the applied stress. Based on this coupling, we demonstrate that we can directionally control the lithium distribution by applying different stresses to lithium alloy materials. Our results provide insights into stress-lithium electrochemistry coupling at the nanoscale and suggest potential applications of lithium alloy nanoparticles.

Original languageEnglish
Number of pages1
JournalNature communications
Volume10
Issue number1
DOIs
Publication statusPublished - 2019 Jul 31

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Seo, H. K., Park, J. Y., Chang, J. H., Dae, K. S., Noh, M. S., Kim, S. S., Kang, C-Y., Zhao, K., Kim, S., & Yuk, J. M. (2019). Strong stress-composition coupling in lithium alloy nanoparticles. Nature communications, 10(1). https://doi.org/10.1038/s41467-019-11361-z