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Li 2 S 6 ‐Integrated PEO‐Based Polymer Electrolytes for All‐Solid‐State Lithium‐Metal Batteries
Author(s) -
Fang Ruyi,
Xu Biyi,
Grundish Nicholas S.,
Xia Yang,
Li Yutao,
Lu Chengwei,
Liu Yijie,
Wu Nan,
Goodenough John B.
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202106039
Subject(s) - electrolyte , ionic conductivity , lithium (medication) , ethylene oxide , electrochemistry , materials science , oxide , polymer , ionic bonding , chemical engineering , metal , inorganic chemistry , electrochemical window , chemistry , electrode , ion , organic chemistry , composite material , copolymer , metallurgy , medicine , engineering , endocrinology
The integration of Li 2 S 6 within a poly(ethylene oxide) (PEO)‐based polymer electrolyte is demonstrated to improve the polymer electrolyte's ionic conductivity because the strong interplay between O 2− (PEO) and Li + from Li 2 S 6 reduces the crystalline volume within the PEO. The Li/electrolyte interface is stabilized by the in situ formation of an ultra‐thin Li 2 S/Li 2 S 2 layer via the reaction between Li 2 S 6 and lithium metal, which increases the ionic transport at the interface and suppresses lithium dendrite growth. A symmetric Li/Li cell with the Li 2 S 6 ‐integrated composite electrolyte has excellent cyclability and a high critical current density of 0.9 mA cm −2 at 40 °C. Impressive electrochemical performance is demonstrated with all‐solid‐state Li/LiFePO 4 and high‐voltage Li/LiNi 0.8 Mn 0.1 Co 0.1 O 2 cells at 40 °C.