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Dendrite‐Free Lithium Anodes with a Metal Organic Framework‐Derived Cake‐like TiO 2 Coating on the Separator
Author(s) -
Fu Shiyang,
Wang Lili,
Zhao Teng,
Li Li,
Wu Feng,
Chen Renjie
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000401
Subject(s) - faraday efficiency , separator (oil production) , anode , materials science , mesoporous material , chemical engineering , coating , calcination , electrochemistry , dendrite (mathematics) , lithium (medication) , cathode , nanoparticle , ceramic , nanotechnology , electrode , composite material , chemistry , catalysis , medicine , physics , endocrinology , thermodynamics , engineering , biochemistry , geometry , mathematics
Lithium metal, with a high theoretical capacity of 3860 mAh/g and a low electrochemical potential of −3.040 V, is an attractive anode material. However, its application has been hampered by irregular lithium dendrite growth and low coulombic efficiency. To solve these problems, a facile air calcination strategy was used to prepare cake‐like TiO 2 nanoparticles with rich pores, which were further coated on one side of the commercial Celgard separator. The nanoscale mesoporous channels on the surface of TiO 2 particles can effectively block the growth of lithium dendrites, leading to dense and uniform Li deposition with a high coulombic efficiency. Compared with the blank cell (50 cycles of normal operation), the Li||Cu cell with modified separator can run 100 cycles at 2 mA/cm 2 with an average coulombic efficiency of 97.3 %. These results herald a new approach to dendrite‐free lithium anodes by nanostructured ceramic coating on the separator.