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MOF-derived nanoporous multifunctional fillers enhancing performances of polymer electrolytes for solid-state lithium batteries

Abstract

Polymer electrolytes usually suffer from low ionic conductivity and poor stability against lithium electrode. Taking the advantage of nanostructured metal-organic-frameworks (MOFs), novel nanoporous fillers, i.e. UIO/Li-IL, are developed for polymer electrolytes; in UIO/Li-IL, Li-containing ionic liquid (Li-IL) is absorbed in UIO-66 MOFs. These fillers are multifunctional: with high ionic conductivity, capable to suppress the crystallinity and to improve the stability of polyethylene oxide (PEO) against lithium electrode. PEO-n-UIO composite polymer electrolytes are formed by dispersing the multifunctional fillers in PEO; the conductivity of the PEO-n-UIO solid electrolytes is increased by a factor of ~37 to 1.3 × 10-4 S cm-1 at 30 °C with 40% UIO/Li-IL, and the current density for stable Li plating/stripping in PEO-n-UIO solid electrolytes is enhanced to 500 μA cm-2 at 60 °C. Solid-state lithium batteries based on the PEO-n-UIO solid electrolyte show an initial discharge capacity of ~151 mA h g-1 with a capacity retention of 95% after 100 cycles at 0.5 C and 60 °C. Our work pioneers a kind of novel multifunctional fillers to boost the performances of composite polymer electrolytes for high energy density, safe and long lifetime energy storage systems.

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Publication details

The article was received on 21 Oct 2018, accepted on 04 Jan 2019 and first published on 04 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA10124H
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript
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    MOF-derived nanoporous multifunctional fillers enhancing performances of polymer electrolytes for solid-state lithium batteries

    J. Wu and X. Guo, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA10124H

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