Ion-Conductive Properties of a Polymer Electrolyte Based on Ethylene Carbonate/Ethylene Oxide Random Copolymer
Ion-Conductive Properties of a Polymer Electrolyte Based on Ethylene Carbonate/Ethylene Oxide Random Copolymer
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DOI：
10.1002/marc.201600652
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发表时间：
2017-04-01
影响因子：
4.6
通讯作者：
Tominaga, Yoichi
中科院分区：
文献类型：
--
作者：
Morioka, Takashi;Nakano, Koji;Tominaga, Yoichi
合成了一种环氧乙烷与CO2的无规共聚物，即聚碳酸乙烯/环氧乙烷（P(EC/EO)），作为一种新型的候选聚合物电解质。P（EC/EO）与二氟砜酰亚胺锂组成的电解质在60℃时离子电导率为0.48 mS cm(-1)，锂离子转移数（t(+)）为0.66。为了研究P（EC/EO）基电解质的离子导电行为，采用傅里叶变换红外（FT-IR）技术分析了共聚物中Li+与官能团之间的相互作用。P（EC/EO）中碳酸盐基团可能优先与Li+而不是醚基团相互作用。该研究表明，碳酸盐和柔性醚单元的共聚可以实现聚合物电解质的高导电性和高t+。高性能P（EC/EO）电解质有望成为全固态电池的候选材料。
A random copolymer of ethylene oxide with CO2, namely, poly(ethylene carbonate/ethylene oxide) (P(EC/EO)), has been synthesized as a novel candidate for polymer electrolytes. Electrolyte composed of P(EC/EO) and lithium bis(fluorosulfonyl) imide has an ionic conductivity of 0.48 mS cm(-1) and a Li transference number (t(+)) of 0.66 at 60 degrees C. To study ion-conductive behavior of P(EC/EO)-based electrolytes, the Fourier transform infrared (FT-IR) technique is used to analyze the interactions between Li+ and functional groups of the copolymer. The carbonate groups may interact preferentially with Li+ rather than the ether groups in P(EC/EO). This study suggests that copolymerization of carbonate and flexible ether units can realize both high conductivity and t+ for polymer electrolytes. High-performance P(EC/EO) electrolyte is expected to be a candidate material for use in all-solid-state batteries.