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

Article

Abstract

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.

Attributes

Attribute NameValues
Creator
  • Chao Tang

  • Andriy Yaroshchuk

  • Merlin Bruening

Journal or Work Title
  • Chemical Communications

Volume
  • 56

Issue
  • 74

First Page
  • 10954

Last Page
  • 10957

Publication Date
  • 2020-05

Subject
  • Magellan SEM

Publisher
  • Royal Society of Chemistry

Date Created
  • 2020-11-24

Language
  • English

Departments and Units
Record Visibility Public
Content License
  • All rights reserved

Digital Object Identifier

doi:10.1039/d0cc03143g

This DOI is the best way to cite this article.

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