Making Advanced Electrogravimetry as an Affordable Analytical Tool for Battery Interface Characterization.
Pierre Lemaire1,2,3, Thomas Dargon1,3, Daniel Alves Dalla Corte1,3
1Chimie du Solide et de l'Energie, UMR 8260, Collège de France, 11 Place Marcelin Berthelot, 75231 cedex 05 Paris, France.
Analytical Chemistry
|September 18, 2020
Summary
This study introduces a simplified protocol using electrochemical quartz crystal microbalance (EQCM) for reliable battery interface analysis. The method ensures accurate measurements of LiFePO4 interfaces, revealing solvent-dependent behaviors crucial for battery performance.
Area of Science:
- Battery technology
- Electrode-electrolyte interfaces
- Electrochemical analysis
Background:
- Battery lifetime and reliability are governed by electrode-electrolyte interfaces.
- Electrochemical quartz crystal microbalance (EQCM) provides interface insights but requires specific film conditions.
- Existing EQCM methods can be complex to implement.
Purpose of the Study:
- To develop a user-friendly protocol for reliable EQCM measurements of battery interfaces.
- To design a versatile EQCM cell for various electrolytes.
- To investigate solvent effects on lithium-ion transport at the LiFePO4 interface.
Main Methods:
- Spray coating for homogeneous film deposition.
- Multiharmonic frequency QCM measurements for film characterization.
- Design of an airtight, versatile EQCM cell for aqueous and non-aqueous electrolytes.
- Dual frequency and motional resistance monitoring during electrochemical cycling of LiFePO4.
Main Results:
- A simplified EQCM protocol ensuring film flatness and rigidity for accurate data.
- Demonstration of dual frequency and motional resistance as reliable indicators for electrogravimetric measurements.
- Identification of solvent-dependent interfacial behavior at the LiFePO4 interface.
- Evidence of near-surface lithium-ion desolvation in aqueous media, facilitating smoother ion transport.
Conclusions:
- The proposed EQCM protocol enhances the reliability and reproducibility of battery interface analysis.
- Solvent choice significantly impacts lithium-ion transport and interfacial behavior.
- EQCM offers valuable insights into interfacial mechanisms, promoting wider adoption in battery research.
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