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Strong stress-composition coupling in lithium alloy nanoparticles.

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.

SUBMITTER: Seo HK

PROVIDER: S-EPMC6668403 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Strong stress-composition coupling in lithium alloy nanoparticles.

Seo Hyeon Kook HK Park Jae Yeol JY Chang Joon Ha JH Dae Kyun Sung KS Noh Myoung-Sub MS Kim Sung-Soo SS Kang Chong-Yun CY Zhao Kejie K Kim Sangtae S Yuk Jong Min JM

Nature communications 20190731 1

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 b ...[more]

PMID: 31366943

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