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Approaches to Electrolyte Solvent Selection for Poly-Anthraquinone Sulfide Organic Electrode Material
Satyajit Phadke1, Mingli Cao1, Mérièm Anouti1
1Laboratoire PCM2E, EA 6299, Université François Rabelais, Parc de Grandmont, 37200, Tours, France.
Chemsuschem
|December 6, 2017
Summary
Polyanthraquinone sulfide (PAQS) organic electrodes show promise for energy storage but dissolve in common electrolytes. Optimized electrolytes using linear alkylcarbonates or ether-based mixtures significantly improve PAQS stability and capacity retention.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Organic materials like polyanthraquinone sulfide (PAQS) are attractive for energy storage due to environmental compatibility, high rate capability, and large charge capacity.
- A key limitation of PAQS is its solubility in typical organic electrolyte solvents, hindering long-term performance.
- Understanding solvent-PAQS interactions is crucial for developing stable and efficient organic electrode materials.
Purpose of the Study:
- To investigate the solubility of PAQS in various organic solvents.
- To evaluate the electrochemical performance and stability of PAQS in different electrolyte formulations.
- To identify optimal electrolyte compositions for enhanced capacity retention in PAQS-based energy storage devices.
Main Methods:
- Solubility testing of PAQS in 17 solvents using UV/Vis spectroscopy, correlated with Hansen solubility analysis.
- Characterization of electrolyte transport properties (conductivity, viscosity) at varying temperatures (-40°C to 80°C).
- Electrochemical evaluation of PAQS in half-cells using galvanostatic cycling with 1 M LiTFSI salt in selected electrolytes.
Main Results:
- PAQS exhibited a wide solubility range, predictable by Hansen solubility parameters.
- Electrolytes based on methylglutaronitrile (2MeGLN) showed capacity fade linked to redox process irreversibility.
- Standard cyclic carbonate electrolytes (EC/PC) caused rapid capacity fade due to high PAQS solubility.
- Pure linear alkylcarbonate (DMC) or binary ether-based (dioxolane/DME) electrolytes demonstrated superior compatibility.
- These optimized electrolytes enabled PAQS to retain over 120 mAh/g for 1000 cycles at 4C.
Conclusions:
- Solvent selection is critical for mitigating PAQS dissolution and improving energy storage device longevity.
- Linear alkylcarbonates and ether-based solvent mixtures offer a promising strategy for stable PAQS electrode performance.
- This study provides valuable insights for designing high-performance organic electrodes for next-generation energy storage systems.
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