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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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A near dimensionally invariable high-capacity positive electrode material
Itsuki Konuma1, Damian Goonetilleke2,3, Neeraj Sharma2
1Department of Chemistry and Life Science, Yokohama National University, Yokohama, Japan.
Nature Materials
|December 12, 2022
Summary
Researchers developed advanced lithium-ion batteries using lithium-excess vanadium oxides. These materials offer high capacity and exceptional stability, demonstrating no capacity fade over 400 cycles in solid-state batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Achieving stable lithium-ion batteries is crucial, as electrode degradation during cycling limits lifespan.
- Electrode material instability, especially in all-solid-state batteries, poses significant challenges.
- Developing high-capacity materials with inherent electrochemical stability is essential for next-generation batteries.
Purpose of the Study:
- To investigate lithium-excess vanadium oxides with a disordered rocksalt structure as advanced positive electrode materials.
- To evaluate the electrochemical performance, capacity, and stability of these materials in both liquid and solid-state electrolytes.
- To understand the structural behavior during cycling to ensure long-term durability.
Main Methods:
- Synthesis of nanosized Li8/7Ti2/7V4/7O2 materials.
- Electrochemical testing in optimized liquid electrolytes and sulfide-based solid electrolytes.
- Operando synchrotron X-ray diffraction and high-precision dilatometry to analyze structural changes during cycling.
Main Results:
- Achieved a large reversible capacity exceeding 300 mAh g-1 with two-electron V3+/V5+ redox, reaching 750 Wh kg-1 versus lithium metal.
- Demonstrated highly reversible lithium storage with no capacity fading over 400 cycles in all-solid-state batteries.
- Observed near dimensionally invariable cycling behavior attributed to reversible vanadium migration.
Conclusions:
- Lithium-excess vanadium oxides are promising high-capacity, long-life positive electrode materials.
- The disordered rocksalt structure exhibits remarkable stability and reversibility during electrochemical cycling.
- This electrode/electrolyte combination enables high-performance batteries through multi-electron redox and a cycling-invariant structure.
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