AI Article Synopsis
- The study investigates how stress during electrochemical reactions impacts the behavior and structure of lithium binary alloys, particularly when lithium is added to tin-tin oxide core-shell nanoparticles.
- Using advanced imaging techniques, the researchers observed a non-uniform distribution of lithium inside the nanoparticles that varies with the applied stress.
- The findings highlight a relationship between stress and lithium distribution, suggesting that applying different stresses can be used to control lithium placement in alloy materials, paving the way for new applications in energy storage.
Article 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.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6668403 | PMC |
| http://dx.doi.org/10.1038/s41467-019-11361-z | DOI Listing |
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