电解质
材料科学
化学工程
离子电导率
锂(药物)
聚合物
电池(电)
热稳定性
电化学窗口
锂离子电池
快离子导体
电化学
纳米技术
电极
复合材料
化学
工程类
内分泌学
物理化学
量子力学
功率(物理)
物理
医学
作者
Qinghui Zeng,Yu Lu,Pingping Chen,Zhenfeng Li,Xin Wen,Wen Wen,Yu Liu,Fujun Zhang,Hailei Zhao,Henghui Zhou,Zhixiang Wang,Liaoyun Zhang
标识
DOI:10.1016/j.jechem.2021.09.040
摘要
The development of the solid-state polymer electrolytes (SPEs) for Li-ion batteries (LIBs) can effectively address the hidden safety issues of commercially used liquid electrolytes. Nevertheless, the unsatisfactory room temperature ion conductivity and inferior mechanical strength for linear PEO-based SPEs are still the immense obstacles impeding the further applications of SPEs for large-scale commercialization. Herein, we fabricate a series of semi-interpenetrating-network (semi-IPN) polymer electrolytes based on a novel liquid crystal (C6M LC) and poly(ethylene glycol) diglycidyl ether (PEGDE) via UV-irradiation at the first time. The LCs not only highly improve the mechanical properties of electrolyte membranes via the construction of network structure with PEGDE, but also create stable ion transport channels for ion conduction. As a result, a free-standing flexible SPE shows outstanding ionic conductivity (5.93 × 10−5 S cm−1 at 30 °C), a very wide electrochemical stability window of 5.5 V, and excellent thermal stability at thermal decomposition temperatures above 360 °C as well as the capacity of suppressing lithium dendrite growth. Moreover, the LiFePO4/Li battery assembled with the semi-IPN electrolyte membranes exhibits good cycle performance and admirable reversible specific capacity. This work highlights the obvious advantages of LCs applied to the electrolyte for the advanced solid lithium battery.
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