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Updated: Oct 4, 2025
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
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The chemical evolution of solid electrolyte interface in sodium metal batteries
Lina Gao1,2, Juner Chen3,4, Qinlong Chen1,2
1Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
Science Advances
|February 11, 2022
Summary
The solid electrolyte interface (SEI) in sodium metal batteries (SMBs) is crucial for longevity. Using sodium difluoro(oxalato)borate (NaDFOB) creates a protective SEI, enhancing battery lifespan.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- The solid electrolyte interface (SEI) on the anode is critical for sodium metal battery (SMB) lifespan.
- SEI evolution during cycling complicates understanding its chemistry and structure.
Purpose of the Study:
- To investigate the protective mechanisms of SEI derived from sodium difluoro(oxalato)borate (NaDFOB) in SMBs.
- To understand the role of NaDFOB in SEI formation and its impact on battery performance.
Main Methods:
- In situ nuclear magnetic resonance (NMR) spectroscopy to observe SEI formation.
- Depth-profiling X-ray photoelectron spectroscopy (XPS) to analyze SEI composition.
- High-resolution solid-state NMR for detailed structural analysis.
Main Results:
- Prior reduction of the DFOB anion initiates SEI formation and suppresses solvent decomposition.
- Cycling transforms the DFOB-derived SEI into a borate and fluoride-rich layer.
- Optimal SEI protection is achieved at 50 cycles, tripling the battery lifespan.
Conclusions:
- NaDFOB is an effective additive for engineering a stable and protective SEI in SMBs.
- Understanding SEI evolution provides guidelines for improving SMB longevity and performance.
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