Ionic Liquid-Laden Zn-MOF-74-Based Solid-State Electrolyte for Sodium Batteries

Sodium batteries are receiving increasing interest as an alternative to reduce dependence on lithium-based systems. Furthermore, the development of solid-state electrolytes will lead to higher-performing and safer devices. In this work, a Zn-based metal–organic framework (Zn-MOF-74) is combined as a...

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Published inBatteries (Basel) Vol. 9; no. 12; p. 588
Main Authors Mirandona-Olaeta, Alexander, Goikolea, Eider, Lanceros-Mendez, Senentxu, Fidalgo-Marijuan, Arkaitz, Ruiz de Larramendi, Idoia
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2023
Subjects
Alternative energy sources
Barriers
Batteries
Composition
Conductivity
Design and construction
Electrolytes
Energy resources
Energy storage
Ion currents
ionic liquid
Ionic liquids
Lithium
Materials
Metal-organic frameworks
metal–organic framework
Molten salt electrolytes
Organometallic compounds
Porous materials
Room temperature
Sodium
sodium battery
Sodium compounds
Solid electrolytes
Solid state
solid-state electrolyte
Solvents
Temperature
Spain
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Summary:Sodium batteries are receiving increasing interest as an alternative to reduce dependence on lithium-based systems. Furthermore, the development of solid-state electrolytes will lead to higher-performing and safer devices. In this work, a Zn-based metal–organic framework (Zn-MOF-74) is combined as a physical barrier against the growth of dendrites, together with 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm][TFSI]) ionic liquid, which provides improved mobility to sodium ions. It is demonstrated that the incorporation of the appropriate amount of ionic liquid within the pores of the MOF produces a considerable increase in ionic conductivity, achieving values as high as 5 × 10−4 S cm−1 at room temperature, in addition to an acceptable Na+ transference number. Furthermore, the developed Na[EMIm][TFSI]@Zn-MOF-74 hybrid solid electrolyte contributes to stable and dendrite-free sodium plating/stripping for more than 100 h. Finally, a more than notable extension of the electrochemical stability window of the electrolyte has been determined, being useful even above 7 V vs. Na+/Na. Overall, this work presents a suitable strategy for the next generation of solid-state sodium batteries.
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries9120588