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Updated: Jul 1, 2025
11:04
Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
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A Molecular-Sieving Interphase Towards Low-Concentrated Aqueous Sodium-Ion Batteries
Tingting Liu1,2,3,4, Han Wu5, Hao Wang1,3,4
1Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, People's Republic of China.
Nano-Micro Letters
|March 4, 2024
Summary
Researchers developed a novel artificial electrode coating for aqueous sodium-ion batteries (ASIBs). This coating significantly improves rechargeability in dilute electrolytes by preventing water decomposition and enhancing ion transport, boosting battery performance and longevity.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous sodium-ion batteries (ASIBs) suffer from poor rechargeability due to water decomposition and electrode dissolution.
- Existing solutions like concentrated or organic electrolytes compromise cost and safety.
Purpose of the Study:
- To enhance the cycling stability of ASIBs in dilute electrolytes.
- To overcome the limitations of current electrolyte designs for ASIBs.
Main Methods:
- Developed artificial electrode coatings using NaX zeolite and a NaOH-neutralized perfluorinated sulfonic polymer.
- Investigated the molecular-sieving effect of the composite interphase on ion transport.
- Tested the performance of Na2MnFe(CN)6//NaTi2(PO4)3 full cells with the coated electrodes.
Main Results:
- The composite interphase demonstrated a molecular-sieving effect, selectively allowing dehydrated Na+ permeance while rejecting hydrated Na+ ions.
- Expanded the electrochemical window of a 2 mol kg-1 sodium trifluoromethanesulfonate electrolyte to 2.70 V.
- Achieved 94.9% capacity retention after 200 cycles at 1 C in full cells.
Conclusions:
- The artificial electrode coating significantly prolongs the cycling life of ASIBs in dilute electrolytes.
- This molecular-sieving interphase offers a cost-effective and safe approach to improve ASIB performance.
- The strategy holds promise for advancing long-term operation of aqueous sodium-ion batteries.
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