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A promising PMHS/PEO blend polymer electrolyte for all-solid-state lithium ion batteries

Abstract

Solid-state lithium metal batteries have emerged as a promising alternative to exist liquid Li-ion batteries and power the future storage market considering the higher energy outputs and better safety. Among various solid electrolyte, polymer electrolytes have received more attention due to their potential advantages, including wide electrochemical windows, ease of processing, low interface impedance and low cost. Polymeric electrolyte based on poly (ethylene oxide) (PEO) as a well-known polymer matrix has been extensively studied because of its highly flexible EO segments in the amorphous phase that can provide channels for lithium ion transport. However, obtaining a PEO-based solid electrolyte with high Li ion conductivity and without sacrificing mechanical strength is still a huge challenge. In this study, the polymethylhydrogen-siloxane (PMHS) with low glass transition temperature and good flexibility was blended into the PEO to optimize the ion transportion by solution casting technique. The hybrid electrolyte membrane with 40% PMHS exhibited high ionic conductivity(2.0×10-2 S cm-1 at 80 °C), large electrochemical windows (5.2 V), high degree flexibility, and thermal stability. When assembling a Li/LiFePO4 battery, a reversible capacity close to 140 mA h g-1 (0.1 C) at 60 °C was delivered. In addition, a cell with this polymer electrolyte exhibits excellent stability. These results demonstrate that the solid polymer electrolyte systems are eligible for next-generation high energy density all-solid-state lithium ion batteries.

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Supplementary files

Publication details

The article was received on 17 Jul 2018, accepted on 07 Sep 2018 and first published on 08 Sep 2018


Article type: Paper
DOI: 10.1039/C8DT02904K
Citation: Dalton Trans., 2018, Accepted Manuscript
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    A promising PMHS/PEO blend polymer electrolyte for all-solid-state lithium ion batteries

    Y. Li, C. Fan, J. Zhang and X. Wu, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT02904K

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