Flow through negatively charged, nanoporous membranes separates Li+ and K+ due to induced electromigration | Zendy

Chao Tang | Zendy; Andriy Yaroshchuk | Zendy; Merlin L. Bruening | Zendy

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Flow through negatively charged, nanoporous membranes separates Li⁺ and K⁺ due to induced electromigration

Author(s) -

Chao Tang,

Andriy Yaroshchuk,

Merlin L. Bruening

Publication year - 2020

Publication title -

chemical communications

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.837

H-Index - 333

eISSN - 1364-548X

pISSN - 1359-7345

DOI - 10.1039/d0cc03143g

Subject(s) - electromigration , selectivity , membrane , concentration polarization , nanoporous , volumetric flow rate , chemistry , chemical physics , permeability (electromagnetism) , nanopore , flow velocity , analytical chemistry (journal) , flow (mathematics) , materials science , thermodynamics , nanotechnology , mechanics , chromatography , catalysis , physics , organic chemistry , composite material , biochemistry

Flow through negatively charged nanopores separates Li + and K + with selectivities of up to 70 and Li + passages from 20% to above 100%. Remarkably, both the Li + /K + selectivity and Li + passage initially increase with flow rate, breaking the permeability/selectivity trade-off. Modelling demonstrates that flow through the membranes creates electric fields that retard transport of cations. Selectivity increases with flow rate because the K + electromigration velocity exceeds its convective velocity, but for Li + electromigration is weaker than convection. Modelling also shows the importance of controlling concentration polarization. With further work, related separations might provide highly pure Li salts for battery manufacturing.

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