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Lithium Ion Pathway within Li 7 La 3 Zr 2 O 12 ‐Polyethylene Oxide Composite Electrolytes
Author(s) -
Zheng Jin,
Tang Mingxue,
Hu YanYan
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201607539
Subject(s) - electrolyte , materials science , ionic conductivity , battery (electricity) , composite number , lithium (medication) , ceramic , fast ion conductor , oxide , chemical engineering , phase (matter) , conductivity , electrode , composite material , chemistry , metallurgy , organic chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
Polymer–ceramic composite electrolytes are emerging as a promising solution to deliver high ionic conductivity, optimal mechanical properties, and good safety for developing high‐performance all‐solid‐state rechargeable batteries. Composite electrolytes have been prepared with cubic‐phase Li 7 La 3 Zr 2 O 12 (LLZO) garnet and polyethylene oxide (PEO) and employed in symmetric lithium battery cells. By combining selective isotope labeling and high‐resolution solid‐state Li NMR, we are able to track Li ion pathways within LLZO‐PEO composite electrolytes by monitoring the replacement of 7 Li in the composite electrolyte by 6 Li from the 6 Li metal electrodes during battery cycling. We have provided the first experimental evidence to show that Li ions favor the pathway through the LLZO ceramic phase instead of the PEO‐LLZO interface or PEO. This approach can be widely applied to study ion pathways in ionic conductors and to provide useful insights for developing composite materials for energy storage and harvesting.