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Suppressed Mobility of Negative Charges in Polymer Electrolytes with an Ether‐Functionalized Anion
Author(s) -
Zhang Heng,
Chen Fangfang,
Lakuntza Oier,
Oteo Uxue,
Qiao Lixin,
MartinezIbañez Maria,
Zhu Haijin,
Carrasco Javier,
Forsyth Maria,
Armand Michel
Publication year - 2019
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.201905794
Subject(s) - electrolyte , ethylene oxide , oxide , materials science , polymer , ether , ion , salt (chemistry) , alkali metal , ionic conductivity , chemistry , polymer chemistry , chemical engineering , inorganic chemistry , organic chemistry , copolymer , electrode , engineering
Suppressing the mobility of anionic species in polymer electrolytes (PEs) is essential for mitigating the concentration gradient and internal cell polarization, and thereby improving the stability and cycle life of rechargeable alkali metal batteries. Now, an ether‐functionalized anion (EFA) is used as a counter‐charge in a lithium salt. As the salt component in PEs, it achieves low anionic diffusivity but sufficient Li‐ion conductivity. The ethylene oxide unit in EFA endows nanosized self‐agglomeration of anions and trapping interactions between the anions and its structurally homologous matrix, poly(ethylene oxide), thus suppressing the mobility of negative charges. In contrast to previous strategies of using anion traps or tethering anions to a polymer/inorganic backbone, this work offers a facile and elegant methodology on accessing selective and efficient Li‐ion transport in PEs and related electrolyte materials (for example, composites and hybrid electrolytes).