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Updated: Jan 23, 2026
10:03
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
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Modulating Cation Intermixing Behavior Enables Wide-Temperature-Stable Na2+2xFe2-x(SO4)3 Cathode for Sodium-Ion
Jingjing Hou1, Shizhong Lv1, Jian Liu1
1State Key Laboratory of Space Power-Sources, MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, MOE Engineering Research Center for Electrochemical Energy Storage and Carbon Neutrality in Cold Regions, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
ACS Nano
|January 22, 2026
Summary
This study introduces a new cathode material strategy for sodium-ion batteries, enhancing stability and ion transport for reliable wide-temperature performance in grid-scale energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium-ion batteries offer a safe and abundant alternative for grid-scale energy storage.
- Wide-temperature operation is limited by poor ion transport and cathode instability.
Purpose of the Study:
- To develop a novel cathode material for sodium-ion batteries with enhanced structural stability and improved kinetics for wide-temperature applications.
- To investigate the effect of cation intermixing via stoichiometric regulation on cathode performance.
Main Methods:
- A cation-intermixing strategy was employed on Na2+2xFe2-x(SO4)3 cathodes.
- Stoichiometric regulation was used to introduce Fe vacancies and facilitate Na+ insertion.
- Electrochemical performance was evaluated across a wide temperature range.
Main Results:
- The Na2.48Fe1.76(SO4)3 cathode demonstrated enhanced structural stability and charge transfer.
- Optimized cation intermixing significantly improved Na+ transport kinetics and reduced diffusion barriers.
- Exceptional cycling stability was observed: 85.9% capacity retention after 3000 cycles at 25 °C and 88.3% after 4000 cycles at -20 °C.
Conclusions:
- Stoichiometry-driven cation intermixing is an effective approach for designing stable and high-performance sulfate-based cathodes.
- The developed cathode material exhibits promising potential for wide-temperature sodium-ion battery applications.
- This strategy addresses key limitations hindering the commercialization of sodium-ion batteries.
Keywords:
Na2+2xFe2−x(SO4)3cation intermixingsodium-ion batteriesstoichiometric regulationwide-temperature cathodeMore Related Videos
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