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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.1K

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Zinc-Sponge Battery Electrodes that Suppress Dendrites
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Functionalized Separator with Integrated Mass Transfer Selectivity and Kinetics Regulation toward Durable Zn Anodes.

Hangjun Ying1, Shenwen Liu1, Qinglong Zhao1

  • 1School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.

ACS Nano
|November 19, 2025
PubMed
Summary
This summary is machine-generated.

A novel bacterial cellulose separator functionalized with boehmite (BM/BC) enhances aqueous zinc-ion battery performance by improving zinc ion transport and suppressing side reactions, leading to extended battery lifespan.

Keywords:
aqueous zinc-ion batterybacterial celluloseboehmitemass transfer regulationseparator

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Limited durability of zinc anodes in aqueous zinc-ion batteries (AZIBs) is primarily due to disordered ion transport and sluggish kinetics.
  • Developing advanced separators is crucial for enhancing AZIB performance and stability.

Purpose of the Study:

  • To develop a functional separator, bacterial cellulose functionalized with boehmite (BM/BC), to regulate ion flux and improve Zn2+ transport kinetics.
  • To enhance the selectivity and suppress interfacial side reactions in AZIBs.

Main Methods:

  • Fabrication of a BM/BC functional separator.
  • Investigation of the separator's interaction with electrolyte species (H2O and SO42-) through coordination effects.
  • Evaluation of Zn2+ desolvation, selective migration, and diffusion barriers.
  • Testing of Zn||Zn symmetric batteries, Zn||MnO2 full batteries, and pouch cells.

Main Results:

  • The BM/BC separator effectively anchors H2O and SO42- anions, facilitating Zn2+ desolvation and selective migration.
  • Achieved an exceptional Zn2+ transference number of 0.81 and significantly suppressed interfacial side reactions.
  • Demonstrated extended lifespan (>2900 h) in symmetric cells, stable cycling (>1000 cycles) in full cells, and robust performance in pouch configurations.

Conclusions:

  • The BM/BC separator provides a feasible strategy for designing advanced separators for high-performance AZIBs.
  • The study offers fundamental insights into regulating ion flux and mitigating interfacial degradation in zinc anodes.