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 () and Jong Min Yuk ()
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Hyeon Kook Seo: Korea Advanced Institute of Science and Technology (KAIST)
Jae Yeol Park: Korea Advanced Institute of Science and Technology (KAIST)
Joon Ha Chang: Korea Advanced Institute of Science and Technology (KAIST)
Kyun Sung Dae: Korea Advanced Institute of Science and Technology (KAIST)
Myoung-Sub Noh: Korea University
Sung-Soo Kim: Chungnam National University
Chong-Yun Kang: Korea University
Kejie Zhao: Purdue University
Sangtae Kim: Korea Institute of Science and Technology (KIST)
Jong Min Yuk: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-11361-z

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