Strong stress-composition coupling in lithium alloy nanoparticles

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-she...

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Bibliographic Details
Published in:Nature communications 2019-07, Vol.10 (1), p.3428-8, Article 3428
Main Authors: Seo, Hyeon Kook, Park, Jae Yeol, Chang, Joon Ha, Dae, Kyun Sung, Noh, Myoung-Sub, Kim, Sung-Soo, Kang, Chong-Yun, Zhao, Kejie, Kim, Sangtae, Yuk, Jong Min
Format: Article
Language:English
Subjects:
147/143
639/301/1023/1026
639/301/299/891
639/301/357/354
639/301/930/328/2082
Alloys
Binary alloys
Chemical reactions
Composition
Core-shell particles
Coupling
Density functional theory
Electrochemistry
Electron microscopy
Graphene
Humanities and Social Sciences
Lithium
Lithium base alloys
Morphology
multidisciplinary
Nanoalloys
Nanoparticles
Science
Science (multidisciplinary)
Stress
Stress concentration
Tin
Tin oxide
Tin oxides
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Summary: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. Electrochemical reactions can generate stresses that detrimentally affect battery electrodes. Here, the authors directly image the lithiation of core-shell tin-based nanoparticles and show that lithium can be redistributed by applying stress and change the nanoparticle composition.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-019-11361-z