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Investigation on the Copolymer Electrolyte of Poly(1,3‐dioxolane‐ co ‐formaldehyde)
Author(s) -
Liu Fengquan,
Li Ting,
Yang Yujie,
Yan Jun,
Li Ning,
Xue Jinxin,
Huo Hong,
Zhou Jianjun,
Li Lin
Publication year - 2020
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000047
Subject(s) - copolymer , electrolyte , ionic conductivity , materials science , dioxolane , polymer chemistry , cationic polymerization , monomer , chemical engineering , polymer , trifluoromethanesulfonate , ionic bonding , polymerization , conductivity , catalysis , chemistry , ion , electrode , organic chemistry , composite material , engineering
A series of copolymers are prepared via cationic ring‐opening polymerization with 1,3‐dioxolane (DOL) and trioxymethylene (TOM) as monomers. The crystallization behaviors of the copolymers can be suppressed by adjusting the ratio of DOL/TOM. With LiBF 4 as a source for a BF 3 initiator, copolymer electrolytes (CPEs) can be prepared in situ inside cells without needing nonelectrolyte catalysts or initiators. The ionic conductivities and Li + diffusion coefficients ( DLi +) of the CPEs increase with a decreasing DOL/TOM ratio in a certain range. The CPE with a DOL/TOM ratio of 8/2 has the highest ionic conductivity as well asDLi +and shows excellent interfacial compatibility with lithium (Li) metal anodes. Li–Li symmetric cells can be uniformly plated/stripped for more than 1200 h. Furthermore, LiFePO 4 –Li cells with 8/2‐CPE display stable cycling performance for over 400 cycles. This strategy is a promising approach for the preparation of high‐performance polymer electrolytes and is sure to promote their application in Li metal batteries.