期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 27, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202000945
关键词
dendrites; lithium metal anodes; LLZO; solid electrolytes; solid-state batteries
类别
资金
- German Federal Ministry of Education and Research (BMBF) [03XP0134C, 03XP0224E]
- (Kekule scholarship) by the Funds of the Chemical Industry (FCI)
The charge transfer kinetics between a lithium metal electrode and an inorganic solid electrolyte is of key interest to assess the rate capability of future lithium metal solid state batteries. In an in situ microelectrode study run in a scanning electron microscope, it is demonstrated that-contrary to the prevailing opinion-the intrinsic charge transfer resistance of the Li|Li6.25Al0.25La3Zr2O12 (LLZO) interface is in the order of 10(-1) omega cm(2) and thus negligibly small. The corresponding high exchange current density in combination with the single ion transport mechanism (t(+) approximate to 1) of the inorganic solid electrolyte enables extremely fast plating kinetics without the occurrence of transport limitations. Local plating rates in the range of several A cm(-2) are demonstrated at defect free and chemically clean Li|LLZO interfaces. Practically achievable current densities are limited by lateral growth of lithium along the surface as well as electro-chemo-mechanical-induced fracture of the solid electrolyte. In combination with the lithium vacancy diffusion limitation during electrodissolution, these morphological instabilities are identified as the key fundamental limitations of the lithium metal electrode for solid-state batteries with inorganic solid electrolytes.
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