Ionic Liquid (IL) Laden Metal-Organic Framework (IL-MOF) Electrolyte for Quasi-Solid-State Sodium Batteries

Xingwen Yu; Nicholas S Grundish; John B Goodenough; Arumugam Manthiram

doi:10.1021/acsami.1c02563

Ionic Liquid (IL) Laden Metal-Organic Framework (IL-MOF) Electrolyte for Quasi-Solid-State Sodium Batteries

ACS Appl Mater Interfaces. 2021 Jun 2;13(21):24662-24669. doi: 10.1021/acsami.1c02563. Epub 2021 May 19.

Authors

Xingwen Yu¹, Nicholas S Grundish¹, John B Goodenough¹, Arumugam Manthiram¹

Affiliation

¹ Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States.

PMID: 34008941
DOI: 10.1021/acsami.1c02563

Abstract

An ionic liquid (IL) laden metal-organic framework (MOF) sodium-ion electrolyte has been developed for ambient-temperature quasi-solid-state sodium batteries. The MOF skeleton is designed according to a UIO-66 (Universitetet i Oslo) structure. A sodium sulfonic (-SO₃Na) group grafted to the UIO-based MOF ligand improves the Na⁺-ion conductivity. Upon lading with a sodium-based ionic liquid (Na-IL), sodium bis(trifluoromethylsulfonyl)imide (NaTFSI) in 1-n-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (Bmpyr-TFSI), the Na-IL laden sulfonated UIO-66 (UIOSNa) quasi-solid electrolyte exhibits a Na⁺-ion conductivity of 3.6 × 10^-4 S cm^-1 at ambient temperature. Quasi-solid-state sodium batteries with the Na-IL/UIOSNa electrolyte are demonstrated with a layered Na₃Ni_1.5TeO₆ cathode and sodium-metal anode. The quasi-solid-state Na∥Na-IL/UIOSNa∥Na₃Ni_1.5TeO₆ cells show remarkable cycling performance.

Keywords: electrochemical energy storage; ionic liquid; metal−organic framework; quasi-solid-state electrolyte; sodium batteries.