期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202003800
关键词
carbonate electrolyte; cryo-TEM; fast ion transfer kinetics; Li-metal full batteries; solid electrolyte interphase
类别
资金
- Key R&D Program of Zhejiang Province [2019C01155]
- National Key R&D Program of China [2018YFA0209600, 2016YFA0202900]
- Natural Science Foundation of China (NSFC) [21676242, 21878268]
Fast Li-metal depletion and severe anode pulverization are the most critical obstacles for the energy-dense Li-metal full batteries using thin Li-metal anodes (<50 mu m). Here, a wavy-nanostructured solid electrolyte interphase (SEI) with fast ion transfer kinetics is reported, which can promote high-efficiency Li-metal plating/stripping (>98% at 4 mAh cm(-2)) in conventional carbonate electrolyte. Cryogenic transmission electron microscopy (cryo-TEM) further reveals the fundamental relationship between wavy-nanostructured SEI, function, and the electrochemical performance. The wavy SEI with greatly decreased surface diffusion resistance can realize grain coarsening of Li-metal deposition and exhaustive dissolution of active Li-metal during the stripping process, which can effectively alleviate dead Li accumulation and anode pulverization problems in practical full cells. Under highly challenging conditions (45 mu m Li-metal anodes, 4.3 mAh cm(-2)high capacity LiNi(0.8)Mn(0.1)Co(0.1)O(2)cathodes), full cells exhibit significantly improved cycling lifespan (170 cycles; 20 cycles for control cells) via the application of wavy SEI.
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