期刊
JOURNAL OF POWER SOURCES
卷 483, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.229028
关键词
Chemo-mechanical modeling; All-solid-state lithium-ion battery; Solid electrolyte/active material interface; Solid electrolyte stiffness; Anisotropic displacement
资金
- US National Science Foundation [1335850]
- DOE Office of Science [DE-AC02-06CH11357]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Waterloo
The study found that the microstructure of composite electrodes in all-solid-state lithium-ion batteries has a significant impact on the stress evolution induced by lithiation, particularly the solid electrolyte/active material interface and void space. Higher pressing pressure during electrode fabrication can improve ion pathways but may lead to stress formation and crack propagation. The stiffness of the solid electrolyte affects stress formation and displacement of the active material.
In this study, a chemo-mechanical modeling framework was developed by adopting a reconstructed three-dimensional morphology of all-solid-state lithium-ion battery (ASSB) composite electrodes, using a synchrotron transmission X-ray microscopy tomography system. The developed model aimed to elucidate the effects of the electrode microstructure, specifically solid electrolyte/active material (SE/AM) interface and void space, toward the lithiation-induced stress evolution. The results show that the peak stress points happen at the SE/AM interface, while void space can partially accommodate the AM swelling and alleviate the stress formation. Although applying higher pressing pressure during the electrode fabrication can improve the ion pathways, it adversely affects the stress formation and may cause crack propagation. The results reveal that SE stiffness has a key impact on stress formation and AM displacement. Although employing SE with a lower stiffness can attenuate the stress within the microstructure, it can exacerbate the anisotropic displacement of AM particles. In contrast, applying external pressing pressure can prevent anisotropic displacement of AM particles. The developed framework highlights the significance of microstructural design of ASSBs and provides invaluable insights.
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