A Molecular-Sieving Interphase Towards Low-Concentrated Aqueous Sodium-Ion Batteries

Abstract

Highlights A molecular-sieving electrode coating towards low-concentrated aqueous sodium-ion batteries is constructed by applying a composite of NaX zeolite and NaOH-neutralized Nafion. Resulting from a molecular sieving effect of zeolite channels and size-shrunken ionic domains in Nafion, the as-prepared coating layer reject hydrated Na+ ions and allow fast dehydrated Na+ permeance. 200 cycles of Na2MnFe(CN)6//NaTi2(PO4)3 full cells can be achieved in a practically feasible 2 m aqueous electrolyte.

Keywords

• Molecular sieving effect
• Electrode coatings
• Aqueous sodium ion batteries
• Dilute aqueous electrolytes