Tuning the Sodium Content for Highly Stable O3-Type Sodium Layered Oxides.
basic_science · Level V
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- Record sourced from PubMed, PMID 40838710.
- Also identified by DOI 10.1021/acs.nanolett.5c02806.
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Abstract
O3-type layered oxides are promising cathodes for sodium-ion batteries (SIBs), but the influence of the sodium (Na) content on phase transitions across different voltage windows remains unclear. In this work, a series of gradient Na-content materials, Na<sub><i>x</i></sub>Li<sub>0.05</sub>Ni<sub>0.45</sub>Mn<sub>0.25</sub>Mg<sub>0.05</sub>Ti<sub>0.25</sub>O<sub>2</sub> (<i>x</i> = 0.70-0.95), were synthesized via solid-state reaction. In situ X-ray diffraction (XRD) and full-field transmission X-ray microscopy analyses reveal that increasing the Na content alters the discharge capacity and cycling stability. Despite similar phase evolution above 3 V, significant differences emerge below 3 V, where the persistence of the O3-phase plateau becomes a key indicator of structural integrity. In situ XRD confirms that higher Na content extends this plateau duration. These results highlight a direct correlation between the length of the low-voltage plateau and bulk structural stability, offering new guidance for designing robust cathodes via tuning of the Na content and voltage windows.