MOF glass based solid-state polymer electrolyte for lithium metal batteries

Junwei Ding, Tao Du, Morten Mattrup Smedskjær

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Abstract

Polymer solid-state electrolytes are promising candidates for solid-state lithium metal batteries, but fillers play a very critical role in adjusting their network structure, electrochemical properties, thermal stability, and mechanical properties. However, most of the fillers reported so far are anisotropic, which limits the potential to enable isotropic ion transport. Here, we prepare polyethylene oxide (PEO) based solid-state electrolytes using a metal-organic framework (MOF) glass (namely ZIF-62 glass) as an isotropic functional filler. 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 Li-ion transport. By also incorporating a lithium salt (LiTFSI) and ionic liquid (IL), Li-Li symmetric cell tests of the PEO-LiTFSI-MOF glass-IL electrolyte reveal low overpotential, indicating low interfacial impedance. Molecular dynamics simulations show that the isotropic structure of the MOF glass facilitates wettability of the ionic liquid by enhancing interfacial interactions, leading to a less confined ionic liquid structure that promotes Li-ion mobility. Finally, the PEO-LiTFSI-MOF glass-IL electrolyte is used to construct Li-Li iron phosphate full batteries that feature high cycle stability and rate capability.
Original languageEnglish
Publication date2023
Publication statusPublished - 2023
EventAnnual Meeting of the Danish Electrochemical Society 2023 -
Duration: 2 Nov 20233 Nov 2023

Conference

ConferenceAnnual Meeting of the Danish Electrochemical Society 2023
Period02/11/202303/11/2023

Keywords

  • MOF glass, functional filler, solid-state polymer electrolyte, ionic liquid, lithium metal batteries

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