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Direct View on the Origin of High Li + Transfer Impedance in All‐Solid‐State Battery
Author(s) -
Yang Liting,
Li Xiao,
Pei Ke,
You Wenbin,
Liu Xianhu,
Xia Hui,
Wang Yonggang,
Che Renchao
Publication year - 2021
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.202103971
Subject(s) - materials science , nanocrystalline material , electrolyte , electrochemistry , lithium (medication) , electrode , layer (electronics) , chemical engineering , electrical impedance , battery (electricity) , chemical physics , nanotechnology , thermodynamics , chemistry , electrical engineering , medicine , power (physics) , physics , endocrinology , engineering
Large interfacial resistance plays a dominant role in the performance of all‐solid‐state lithium‐ion batteries. However, the mechanism of interfacial resistance has been under debate. Here, the Li + transport at the interfacial region is investigated to reveal the origin of the high Li + transfer impedance in a LiCoO 2 (LCO)/LiPON/Pt all‐solid‐state battery. Both an unexpected nanocrystalline layer and a structurally disordered transition layer are discovered to be inherent to the LCO/LiPON interface. Under electrochemical conditions, the nanocrystalline layer with insufficient electrochemical stability leads to the introduction of voids during electrochemical cycles, which is the origin of the high Li + transfer impedance at solid electrolyte‐electrode interfaces. In addition, at relatively low temperatures, the oxygen vacancies migration in the transition layer results in the formation of Co 3 O 4 nanocrystalline layer with nanovoids, which contributes to the high Li + transfer impedance. This work sheds light on the mechanism for the high interfacial resistance and promotes overcoming the interfacial issues in all‐solid‐state batteries.