电解质
材料科学
离解(化学)
离子
化学物理
离子电导率
电导率
聚合物
法拉第效率
环氧乙烷
氧化物
热传导
快离子导体
氧气
化学
化学工程
纳米技术
电极
物理化学
有机化学
共聚物
复合材料
工程类
冶金
作者
Yongli Song,Luyi Yang,Jiawen Li,Mingzheng Zhang,Yaohui Wang,Shunning Li,Shiming Chen,Kai Yang,Kang Xu,Feng Pan
出处
期刊:Small
[Wiley]
日期:2021-09-15
卷期号:17 (42)
被引量:34
标识
DOI:10.1002/smll.202102039
摘要
Despite their promised safety and mechanical flexibility, solvent-free polymer electrolytes suffer from low Li-ion conductivities due to poor dissociation of conducting salts and low Li+ -transference numbers due to Li+ -trapping by ether-linkages. In this work, the authors found that oxygen vacancies carried by nanosized Al2 O3 fillers preferentially promotes Li+ -conduction in poly(ethylene oxide) (PEO). These vacancies and free electrons therein, whose concentration can be tuned, effectively break up the ion pairs by weakening the Coulombic attraction within them, while simultaneously interacting with the anions, thus preferentially constraining the movement of anions. This synergistic dissociation-and-trapping effect leads to the significant and selective improvement in Li-ion conductivity. Solid state batteries built on such PEO-based electrolytes exhibits superior performance at high current density. This discovery reveals a molecular-level rationale for the long-observed phenomenon that certain inorganic nano-fillers improve ion conduction in PEO, and provides a universal approach to tailor superior polymer-based electrolytes for the next generation solid-state batteries.
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