期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102283
关键词
creep; contact model; interfacial contact; Li anodes; Li stress; solid-state batteries; void formation
类别
资金
- National Natural Science Foundation of China [11872177]
- Ford Summer Sabbatical Program
- UM-Dearborn
- China Scholarship Council
Research has shown that in the presence of interfacial defects at the Li/solid electrolyte interface, the creep-induced flux enhancement of vacancies is the primary mechanism that impedes void formation. In contrast to simulations on an ideal flat Li/solid electrolyte interface, interfaces with defects have a greater impact on void formation.
Interfacial instability from void formation at the solid-solid interface is one of the crucial challenges in solid-state batteries. However, the fundamental mechanism as to how stress is generated in lithium and thus impacts void formation has not been established. A general creep/contact electro-chemo-mechanical model is herein developed to reveal the mechanisms of void formation at the Li/solid electrolyte (SE) interface during stripping. Li stress calculation is achieved by presuming that the strain-rate-dependent creep deformation of Li metal acts like that of an incompressible viscous fluid flow. The results demonstrate that the dominant mechanism that impedes void formation is the creep-induced flux enhancement of vacancies, which are transported into Li metal for a non-ideal Li/SE interface with pre-existing interfacial defects. This contrasts with previous simulations on an ideal flat Li/SE interface in which the vacancy diffusion away from the interface is shown to govern whether voids are formed.
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