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In Situ Subangstrom‐Thick Organic Engineering Enables Mono‐scale, Ultrasmall ZnO Nanocrystals for a High Initial Coulombic Efficiency, Fully Reversible Conversion, and Cycle‐Stable Li‐Ion Storage
Author(s) -
Song Huawei,
Su Jian,
Wang Chengxin
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201900426
Subject(s) - materials science , faraday efficiency , nanocrystal , in situ , ion , nanotechnology , chemical engineering , energy storage , scale (ratio) , electrode , electrochemistry , organic chemistry , chemistry , thermodynamics , engineering , power (physics) , physics , quantum mechanics
A solid electrolyte interphase (SEI)‐free surface and fully reversible conversion are simultaneously realized in the Li‐ion storage of a specially designed ZnO porous nanocomposite with in situ surfaces/interfaces organic encapsulation for the first time. The built‐in oxygen‐ and/or moisture‐isolating organic layer of subangstrom thickness not only avoids the SEI formation, but also guarantees monodisperse and ultrasmall dimensions of ZnO nanocrystals, which are crucial for the high initial Coulombic efficiency (ICE) and fully reversible conversion. Benefiting from the high ICE up to 91.4%, stable long‐term cyclibility (95% capacity retention at 1 A g −1 after 1400 cycles), and no sacrificing Li‐ion storage capability (868 mAh g −1 at 0.1 A g −1 ), the ZnO nanocomposite demonstrates the highest initial Li‐ion utilization efficiency (ILUE, ≈85.4%) among previous transition metal oxide–based full cells.