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Li+ Dynamics of Liquid Electrolytes Nanoconfined in Metal-Organic Frameworks.


ABSTRACT: Metal-organic frameworks (MOFs) are excellent platforms to design hybrid electrolytes for Li batteries with liquid-like transport and stability against lithium dendrites. We report on Li+ dynamics in quasi-solid electrolytes consisting in Mg-MOF-74 soaked with LiClO4-propylene carbonate (PC) and LiClO4-ethylene carbonate (EC)/dimethyl carbonate (DMC) solutions by combining studies of ion conductivity, nuclear magnetic resonance (NMR) characterization, and spin relaxometry. We investigate nanoconfinement of liquid inside MOFs to characterize the adsorption/solvation mechanism at the basis of Li+ migration in these materials. NMR supports that the liquid is nanoconfined in framework micropores, strongly interacting with their walls and that the nature of the solvent affects Li+ migration in MOFs. Contrary to the "free'' liquid electrolytes, faster ion dynamics and higher Li+ mobility take place in LiClO4-PC electrolytes when nanoconfined in MOFs demonstrating superionic conductor behavior (conductivity σrt > 0.1 mS cm-1, transport number tLi+ > 0.7). Such properties, including a more stable Li electrodeposition, make MOF-hybrid electrolytes promising for high-power and safer lithium-ion batteries.

SUBMITTER: Farina M 

PROVIDER: S-EPMC8603352 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature

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Li<sup>+</sup> Dynamics of Liquid Electrolytes Nanoconfined in Metal-Organic Frameworks.

Farina Marco M   Duff Benjamin B BB   Tealdi Cristina C   Pugliese Andrea A   Blanc Frédéric F   Quartarone Eliana E  

ACS applied materials & interfaces 20211109 45


Metal-organic frameworks (MOFs) are excellent platforms to design hybrid electrolytes for Li batteries with liquid-like transport and stability against lithium dendrites. We report on Li<sup>+</sup> dynamics in quasi-solid electrolytes consisting in Mg-MOF-74 soaked with LiClO<sub>4</sub>-propylene carbonate (PC) and LiClO<sub>4</sub>-ethylene carbonate (EC)/dimethyl carbonate (DMC) solutions by combining studies of ion conductivity, nuclear magnetic resonance (NMR) characterization, and spin re  ...[more]

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