Dual-site substitution enables high-voltage P2-Na0.67Ni0.33Mn0.67O2 cathodes with superior wide-temperature performance and enhanced ambient stability for sodium-ion batteries

Puntos clave

• The research aims to improve the performance and stability of P2-type sodium-ion battery cathodes by addressing critical limitations.
• Developed a synergistic doping strategy for P2-type NaxNiyMnzO2 cathodes.
• Characterized the cathodes under varying temperatures and high-voltage conditions.
• Evaluated the effects of dual-site substitution on phase stability and degradation.
• The dual-site substituted cathodes exhibited enhanced performance at high voltages, with improvements in phase stability.
• Significant reduction in high-voltage degradation was observed, with initial capacity retention rates exceeding 85% after multiple cycles.
• Hygroscopicity was minimized, indicating better ambient stability in operational environments.