Elucidating the stabilizing effect of copper substitution in high voltage P2-type layered oxides for sodium ion batteries

Key Points

• Investigate how copper substitution can improve the stability of P2-type layered sodium transition-metal oxides in high-voltage sodium-ion batteries.
• Analyzed structural characteristics of P2-type layered oxides before and after copper substitution
• Tested electrochemical performance in varying voltage conditions
• Measured capacity retention over multiple charge-discharge cycles
• Copper substitution significantly improved structural stability under high-voltage conditions
• Enhanced capacity retention observed during cycling tests
• Reduction in irreversible redox reactions was noted with copper-enriched materials