Premium
Engineering Wavy‐Nanostructured Anode Interphases with Fast Ion Transfer Kinetics: Toward Practical Li‐Metal Full Batteries
Author(s) -
Zhang Weidong,
Shen Zeyu,
Li Siyuan,
Fan Lei,
Wang Xinyang,
Chen Fang,
Zang Xiaoxian,
Wu Tian,
Ma Fuyuan,
Lu Yingying
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202003800
Subject(s) - materials science , anode , electrolyte , chemical engineering , electrochemistry , metal , cathode , dissolution , stripping (fiber) , kinetics , plating (geology) , electrochemical kinetics , diffusion , electrode , metallurgy , composite material , chemistry , physics , quantum mechanics , engineering , geophysics , thermodynamics , geology
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 µm). 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 µm 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.