期刊
JOURNAL OF ENERGY CHEMISTRY
卷 64, 期 -, 页码 395-403出版社
ELSEVIER
DOI: 10.1016/j.jechem.2021.04.037
关键词
Solid polymer electrolyte; Amorphous polymer; Ionic conductivity; Room temperature; Arrhenius equation
资金
- National Natural Science Foundation of China [22021001, 21875195]
- Fundamental Research Funds for the Central Universities [20720190040]
- Key Project of Science and Technology of Xiamen [3502Z20201013]
In this study, an amorphous polymer electrolyte with EO and PO block structure was synthesized to improve the ionic conductivity, leading to a further improved ionic conductivity value by constructing a dual range fast ionic conduction.
Poly(ethylene oxide) (PEO) is a classic matrix model for solid polymer electrolyte which can not only dissociate lithium-ions (Li+), but also can conduct Li+ through segmental motion in long-range. However, the crystal aggregation state of PEO restricts the conduction of Li+ especially at room temperature. In this work, an amorphous polymer electrolyte with ethylene oxide (EO) and propylene oxide (PO) block structure (B-PEG@DMC) synthesized by the transesterification is firstly obtained, showing an ionic conductivity value of 1.1 x 10(-5) S/cm at room temperature (25 degrees C). According to the molecular dynamics (MD) simulation, the PO segments would lead to an inconsecutive and hampered conduction of Li+, which is not beneficial to the short range conduction of Li+. Thus the effect of transformation of aggregation state on the improvement of ionic conductivity is not enough, it is necessary to further consider the different coupled behaviours of EO and PO segments with Li+. In this way, we blend this amorphous polymer (B-PEG@DMC) with PEO to obtain a dual range ionic conductive solid polymer electrolyte (D-SPE) with further improved ionic conductivity promoted by constructing a dual range fast ionic conduction, which eventually shows a further improved ionic conductivity value of 2.3 x 10(-5) S/cm at room temperature. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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