4.8 Article

Top-Down Li Deposition Pathway Enabled by an Asymmetric Design for Li Composite Electrode

期刊

ADVANCED ENERGY MATERIALS
卷 9, 期 35, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201901491

关键词

anodes; asymmetry design; films; lithium metal batteries; molybdenum net

资金

  1. National Natural Science Foundation of China [51502039]
  2. U. S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office
  3. DOE Office of Science [DE-AC02-06CH11357]

向作者/读者索取更多资源

Designing Li composite electrodes with host frameworks for accommodating Li metal has been considered to be an effective approach to suppress Li dendrites. Herein, an asymmetric design of a Mo net/Li metal film (MLF) composite electrode is developed by an inverted thermal infusion method. The asymmetric MLF electrode has a dense oxide passivated layer on the top side, a porous Mo net matrix on the back side, and active Li layer in between. The back side has a larger specific area and higher electric field than the top side, which contacts with the separator upon cycling, triggering the preferred Li deposition and stripping of the porous back side of the electrode far from the separator. The surface passivation layer on the top side of the electrode as an artificial solid electrolyte interphase ensures the stable contact with the electrolyte and separator. Meanwhile, the porous structure of the supporting Mo net provides enough space for accommodating the volume change during Li deposition and stripping. This asymmetry design enables a unique top down growth pathway for Li deposition in the MLF electrode, suppressing the dendrite growth effectively. The design strategy provides a new direction for high-energy dendrite-free Li metal anodes.

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