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Updated: Jun 18, 2025
07:55
Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
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Insight into Anionic Discrepancies in Bipolar Poly(Thionine) Organic Cathodes for Aqueous Zinc Ion Batteries
Shuai Zhan1,2, Chunfang Wang2,3, Leheng Zhong2
1Materials Genome Institute, Shanghai University, Shanghai, 200444, China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 1, 2024
Summary
This study explores anions in aqueous zinc ion batteries (AZIBs), finding perchlorate (ClO4-) offers the fastest kinetics with bipolar poly(thionine) cathodes. This enhances battery performance and understanding of anion roles in AZIBs.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Aqueous zinc ion batteries (AZIBs) show promise due to sustainable organic electrode materials.
- Research often overlooks anion influence, focusing mainly on cation storage mechanisms.
- Organic electrode materials offer advantages like tunability and high reversibility.
Purpose of the Study:
- To investigate the kinetic behavior of different anions in AZIBs using poly(thionine) as a cathode.
- To synthesize bipolar poly(thionine) and evaluate its performance in AZIBs.
- To elucidate the role of anions in the electrochemical storage mechanism of AZIBs.
Main Methods:
- Synthesis of bipolar poly(thionine) via polymerization.
- Electrochemical performance testing of poly(thionine) cathodes with various anions (ClO4-, SO42-, Cl-, OTF-).
- Kinetic analysis and mechanism studies to understand ion storage.
Main Results:
- Poly(thionine) demonstrated enhanced stability compared to thionine monomers.
- Perchlorate (ClO4-) exhibited the fastest kinetics, enabling high rate performance (109 mAh g-1 @ 0.5 A g-1 and 92 mAh g-1 @ 20 A g-1).
- Co-storage of cations and anions was observed in Zn(ClO4)2 electrolytes, influenced by ClO4-'s lower electrostatic potential and hydrogen bonding.
Conclusions:
- Bipolar poly(thionine) is an effective cathode material for AZIBs.
- Anion choice significantly impacts AZIB kinetics and performance.
- Understanding anion behavior provides new strategies for designing advanced organic electrode materials for AZIBs.
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