Pr₆O₁₁ modification effectively enhancing sodium storage for Na₃V₂(PO₄)₃ batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Sodium-ion batteries (SIBs) are promising for grid-scale energy storage.
• Na3V2(PO4)3 (NVP) is a favored cathode material due to its structure and high potential.
• NVP suffers from low conductivity and poor interface kinetics, limiting its practical application.

Purpose of the Study:

• To enhance the electrochemical performance of NVP cathode materials for SIBs.
• To address the limitations of low conductivity and inefficient charge transfer in NVP.
• To improve the interface compatibility and overall sodium-ion storage capabilities of NVP.

Main Methods:

• Innovative surface modification of NVP with Pr6O11 nanoparticles.
• Incorporation of Pr6O11, a negative temperature coefficient (NTC) material, to improve conductivity and interface properties.
• Electrochemical characterization of modified NVP electrodes in SIBs, including cycling tests and full-battery assembly.

Main Results:

• Optimized NVP-2%Pr6O11 electrodes demonstrated significantly enhanced conductivity and electrochemical performance.
• High specific capacities were retained at elevated temperatures (27°C and 45°C) and high current densities (8C).
• The modified NVP electrodes exhibited superior capacity retention over 1000 cycles and improved thermal safety in pouch full-battery tests compared to unmodified NVP.

Conclusions:

• Surface modification of NVP with Pr6O11 nanoparticles is an effective strategy to boost SIB performance.
• The enhanced conductivity and interface kinetics contribute to improved cycling stability and energy storage capacity.
• This approach offers valuable insights for developing advanced NVP-based electrodes for next-generation energy storage systems.