Understanding the Degradation of a Model Si Anode in a Li-Ion Battery at the Atomic Scale
| Autor: | Se-Ho Kim, Kang Dong, Huan Zhao, Ayman A. El-Zoka, Xuyang Zhou, Eric V. Woods, Finn Giuliani, Ingo Manke, Dierk Raabe, Baptiste Gault |
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| Přispěvatelé: | Engineering & Physical Science Research Council (EPSRC) |
| Rok vydání: | 2022 |
| Předmět: |
Technology
Science & Technology 02 Physical Sciences STABILITY Chemistry Physical HIGH-CAPACITY Physics ELECTRODES Materials Science Materials Science Multidisciplinary Physics Atomic Molecular & Chemical Batteries Electrodes Electrolytes Grain boundaries Ions Chemistry PHOSPHORUS Physical Sciences GRAIN-BOUNDARY SEGREGATION Science & Technology - Other Topics General Materials Science Nanoscience & Nanotechnology LITHIATION Physical and Theoretical Chemistry SILICON 03 Chemical Sciences |
| Zdroj: | The Journal of Physical Chemistry Letters |
| ISSN: | 1948-7185 |
| Popis: | To advance the understanding of the degradation of the liquid electrolyte and Si electrode, and their interface, we exploit the latest developments in cryo-atom probe tomography. We evidence Si anode corrosion from the decomposition of the Li salt before charge-discharge cycles even begin. Volume shrinkage during delithiation leads to the development of nanograins from recrystallization in regions left amorphous by the lithiation. The newly created grain boundaries facilitate pulverization of nanoscale Si fragments, and one is found floating in the electrolyte. P is segregated to these grain boundaries, which confirms the decomposition of the electrolyte. As structural defects are bound to assist the nucleation of Li-rich phases in subsequent lithiations and accelerate the electrolyte's decomposition, these insights into the developed nanoscale microstructure interacting with the electrolyte contribute to understanding the self-catalyzed/accelerated degradation Si anodes and can inform new battery designs unaffected by these life-limiting factors. |
| Databáze: | OpenAIRE |
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