Metal-Organic Framework Glass as a Functional Filler Enables Enhanced Performance of Solid-State Polymer Electrolytes for Lithium Metal Batteries

Junwei Ding, Tao Du, Emil Harbo Thomsen, David Andresen, Mathias Rengnér Fischer, Anders Krogsgaard Møller, Andreas Rasmus Petersen, Andreas Kruse Pedersen, Lars Rosgaard Jensen, Shiwen Wang, Morten Mattrup Smedskjær*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

2 Citations (Scopus)
1 Downloads (Pure)

Abstract

Polymers are promising candidates as solid-state electrolytes due to their performance and processability, but fillers play a critical role in adjusting the polymer network structure and electrochemical, thermal, and mechanical properties. Most fillers studied so far are anisotropic, limiting the possibility of homogeneous ion transport. Here, applying metal-organic framework (MOF) glass as an isotropic functional filler, solid-state polyethylene oxide (PEO) electrolytes are prepared. Calorimetric and diffusion kinetics tests show that the MOF glass addition reduces the glass transition temperature of the polymer phase, improving the mobility of the polymer chains, and thereby facilitating lithium (Li) ion transport. By also incorporating the lithium salt and ionic liquid (IL), Li–Li symmetric cell tests of the PEO-lithium salt-MOF glass-IL electrolyte reveal low overpotential, indicating low interfacial impedance. Simulations show that the isotropic structure of the MOF glass facilitates the wettability of the IL by enhancing interfacial interactions, leading to a less confined IL structure that promotes Li-ion mobility. Finally, the obtained electrolyte is used to construct Li–lithium iron phosphate full batteries that feature high cycle stability and rate capability. This work therefore demonstrates how an isotropic functional filler can be used to enhance the electrochemical performance of solid-state polymer electrolytes.
Original languageEnglish
Article number2306698
JournalAdvanced Science
Volume11
Issue number10
DOIs
Publication statusPublished - Mar 2024

Bibliographical note

© 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.

Keywords

  • functional filler
  • ionic liquid
  • lithium metal batteries
  • metal-organic framework glass
  • solid-state polymer electrolyte

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