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Dual modification of P2-type Na0.67Ni0.33Mn0.67O2 via Mg2+ doping and Na3PO4 coating for enhanced stability in sodium-ion batteries
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DOI：10.1007/s10800-026-02481-8.png)
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Abstract
En 中文
P2-type layered oxide Na0.67Ni0.33Mn0.67O2 is regarded as a very promising cathode material for sodium-ion batteries, due to its several advantages such as high theoretical capacity, low cost, and environmental friendliness. However, its application in high-performance batteries has been hindered by P2 - O2 phase transition problem under high voltage and the interface side reactions. Here, an approach was proposed to combine internal Mg2+ doping with surface Na3PO4 coating to enhance the stability of the Na0.67Ni0.33Mn0.67O2 materials. Adding Mg2+ to the Na0.67Ni0.33Mn0.67O2 material effectively inhibited the phase transformation, reducing the volume change of the material particles and preventing cracking. The Na3PO4 coating stabilized the Na+ migration at the cathode-electrolyte interface, protecting the active materials from electrolyte corrosion. The final results show that the Na0.67Ni0.28Mg0.05Mn0.67O2 electrode coated with 3.0 wt% Na3PO4 exhibited an 81.6% capacity retention rate after 100 cycles at a 1 C rate, which is higher than that of pristine Na0.67Ni0.33Mn0.67O2 electrode (51.9%). Furthermore, at a high rate of 5 C, it delivered a discharge specific capacity of 89.9 mAh g(- 1).
Keywords:
Sodium-ion batteries
Na0.67Ni0.33Mn0.67O2
Mg2+ doping
Na3PO4 coating
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