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Enhanced Surface Interactions Enable Fast Li + Conduction in Oxide/Polymer Composite Electrolyte
Author(s) -
Wu Nan,
Chien PoHsiu,
Qian Yumin,
Li Yutao,
Xu Henghui,
Grundish Nicholas S.,
Xu Biyi,
Jin Haibo,
Hu YanYan,
Yu Guihua,
Goodenough John B.
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201914478
Subject(s) - electrolyte , oxide , materials science , composite number , conductivity , ethylene oxide , ceramic , polymer , fast ion conductor , inorganic chemistry , perovskite (structure) , chemical engineering , chemistry , composite material , electrode , copolymer , engineering , metallurgy
Abstract Li + ‐conducting oxides are considered better ceramic fillers than Li + ‐insulating oxides for improving Li + conductivity in composite polymer electrolytes owing to their ability to conduct Li + through the ceramic oxide as well as across the oxide/polymer interface. Here we use two Li + ‐insulating oxides (fluorite Gd 0.1 Ce 0.9 O 1.95 and perovskite La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 2.55 ) with a high concentration of oxygen vacancies to demonstrate two oxide/poly(ethylene oxide) (PEO)‐based polymer composite electrolytes, each with a Li + conductivity above 10 −4 S cm −1 at 30 °C. Li solid‐state NMR results show an increase in Li + ions (>10 %) occupying the more mobile A2 environment in the composite electrolytes. This increase in A2‐site occupancy originates from the strong interaction between the O 2− of Li‐salt anion and the surface oxygen vacancies of each oxide and contributes to the more facile Li + transport. All‐solid‐state Li‐metal cells with these composite electrolytes demonstrate a small interfacial resistance with good cycling performance at 35 °C.