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Polymer‐in‐“Quasi‐Ionic Liquid” Electrolytes for High‐Voltage Lithium Metal Batteries
Author(s) -
Wu Haiping,
Xu Yaobin,
Ren Xiaodi,
Liu Bin,
Engelhard Mark H.,
Ding Michael S.,
ElKhoury Patrick Z.,
Zhang Linchao,
Li Qiuyan,
Xu Kang,
Wang Chongmin,
Zhang JiGuang,
Xu Wu
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902108
Subject(s) - materials science , electrolyte , cathode , polymer , anode , lithium (medication) , ionic liquid , oxide , ionic bonding , chemical engineering , inorganic chemistry , electrode , ion , organic chemistry , chemistry , composite material , medicine , engineering , metallurgy , endocrinology , catalysis
Due to the limited oxidation stability (<4 V) of ether oxygen in its polymer structure, polyethylene oxide (PEO)‐based polymer electrolytes are not compatible with high‐voltage (>4 V) cathodes, thus hinder further increases in the energy density of lithium (Li) metal batteries (LMBs). Here, a new type of polymer‐in‐“quasi‐ionic liquid” electrolyte is designed, which reduces the electron density on ethereal oxygens in PEO and ether solvent molecules, induces the formation of stable interfacial layers on both surfaces of the LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC) cathode and the Li metal anode in Li||NMC batteries, and results in a capacity retention of 88.4%, 86.7%, and 79.2% after 300 cycles with a charge cutoff voltage of 4.2, 4.3, and 4.4 V for the LMBs, respectively. Therefore, the use of “quasi‐ionic liquids” is a promising approach to design new polymer electrolytes for high‐voltage and high‐specific‐energy LMBs.