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Sn(II)-Pyrophosphate Complex with Low Plating/Stripping Potential for Sn-I Flow Battery Applications.
Shengwen Tan1, Dunyong He1, Tian Xu1
1Institute of Innovation Materials and Energy, School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
Inorganic Chemistry
|February 18, 2025
Summary
A novel tin-based electrolyte (Sn(P2O7)26-) significantly lowers electrode potentials for high-voltage redox flow batteries. This advancement enables stable cycling and high energy efficiency without dendrite formation.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Developing high-voltage redox flow batteries is crucial for efficient energy storage.
- Reducing plating/stripping potentials of metallic electrodes is key to advancing battery technology.
Purpose of the Study:
- To introduce a novel Sn-based chelated electrolyte for high-voltage redox flow batteries.
- To investigate the effect of pyrophosphate ligands on tin electrode potentials.
Main Methods:
- Synthesized a Sn-based chelated electrolyte (Sn(P2O7)26-) by reacting Sn2+ with excess P2O74-.
- Conducted electrochemical tests to evaluate plating/stripping potentials and battery performance.
- Analyzed Sn deposition for dendrite formation.
Main Results:
- The Sn(P2O7)26- electrolyte shifted the plating/stripping potential to -0.67 V.
- The Sn-I flow battery achieved an average cell voltage of 1.2 V.
- Stable cycling over 250 cycles at 80 mA cm-2 with 70% energy efficiency was demonstrated.
- No dendrite formation was observed during Sn deposition.
Conclusions:
- High-concentration P2O74- ligands effectively reduce Sn plating/stripping potentials.
- The novel electrolyte enables high-voltage, stable, and efficient Sn-based flow batteries.
- This research opens avenues for developing advanced high-voltage Sn-based flow batteries.
