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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Compositionally Complex Doping Enables High-Voltage Spinel Cathodes with Ultrafast Charging and
Huize Wu1,2, Chenhao Zhang1,2, Siqi Guan1
1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
Journal of the American Chemical Society
|May 6, 2026
Summary
Compositionally complex doping enhances the stability and ultrafast charging of high-voltage spinel cathodes for next-generation lithium-ion batteries. This approach improves durability by suppressing degradation mechanisms, enabling longer cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Next-generation lithium-ion batteries require high-voltage cathodes with enhanced stability and fast-charging capabilities.
- Cobalt-free spinel oxides offer high voltage, energy density, and cost-effectiveness but suffer from chemo-electro-mechanical instabilities limiting cycle life.
Purpose of the Study:
- To reconfigure reaction thermodynamics in high-voltage spinel cathodes through complex doping.
- To enable ultrafast charging while maintaining chemo-electro-mechanical stability and extending the solid-solution regime.
Main Methods:
- Leveraging compositionally complex doping to modify spinel cathode materials.
- Utilizing multimodal characterization to analyze reaction pathways and material stability.
- Evaluating electrochemical performance under fast-charging conditions.
Main Results:
- The doped spinel cathode demonstrated an extended solid-solution regime, enabling ultrafast charging.
- Key degradation mechanisms like intragranular cracking and rock salt phase transformation were suppressed.
- The cathode maintained 81.8% capacity after 4000 cycles at 10 C (25 °C) and 82.0% after 1000 cycles at 3 C (60 °C).
Conclusions:
- Compositionally complex doping effectively modulates phase transformation thermodynamics and enhances chemo-electro-mechanical stability in high-voltage spinel cathodes.
- This strategy provides a pathway for designing durable, fast-charging cathode materials for advanced lithium-ion batteries.
- The findings offer new insights into overcoming limitations in current battery technologies.
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