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Rational Design of Mixed Electronic‐Ionic Conducting Ti‐Doping Li 7 La 3 Zr 2 O 12 for Lithium Dendrites Suppression
Author(s) -
Gao Jian,
Zhu Jianxun,
Li Xiaolei,
Li Junpeng,
Guo Xiangxin,
Li Hong,
Zhou Weidong
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.202001918
Subject(s) - overpotential , materials science , electrochemical window , electrolyte , ionic conductivity , lithium (medication) , ceramic , ionic bonding , electrochemistry , chemical engineering , nanotechnology , composite material , ion , electrode , chemistry , organic chemistry , engineering , endocrinology , medicine
Garnet structured ceramic electrolyte Li 7 La 3 Zr 2 O 12 (LLZO) attracts much attention in solid‐state lithium batteries for its high ionic conductivity, wide electrochemical window, and lack of reducible element. However, the application of LLZO has been hindered by severe dendrite penetration. The theoretical investigations on the mechanisms of lithium dendrite evolution are carried out, aiming at quantifying the promotion effects of overpotential and the limitation counterpart of bulk modulus. Since dendrites preferentially propagate along connected defects, while intrinsic defects are difficult to be compeletely eliminated, manipulation of overpotential should be a more feasible way for dendrites suppression. The mixed electronic‐ionic conducting interphase, which in situ forms by introducing a Ti‐doping Li 56 La 24 Zr 15 TiO 96 (T‐LLZO) interlayer between Li and LLZO, is suggested based on the proposed mechanisms, which effectively facilitates to alleviate the overpotential thus suppress the lithium dendrites theoretically. This strategy is verified experimentally by obviously improved stability of Li/Li symmetric cell using T‐LLZO ceramic pellet electrolyte.