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Pearl-Structure-Enhanced NASICON Cathode toward Ultrastable Sodium-Ion Batteries. | LitMetric

AI Article Synopsis

  • Sodium superionic conductors (NASICON), particularly those using vanadium, are seen as promising cathodes for sodium-ion batteries (SIBs) due to their good ionic conductivity and structural stability.
  • A new material, Na V Fe (PO ) (NVFP), is developed using an affordable and eco-friendly method that incorporates Ketjen Black to enhance conductivity and stability.
  • The resulting p-NVFP shows impressive performance with high cycling efficiency, maintaining 87.7% capacity over 5000 cycles, and delivers substantial energy capacity in full cells, proving its potential for scalable energy storage applications.

Article Abstract

Based on the favorable ionic conductivity and structural stability, sodium superionic conductor (NASICON) materials especially utilizing multivalent redox reaction of vanadium are one of the most promising cathodes in sodium-ion batteries (SIBs). To further boost their application in large-scale energy storage production, a rational strategy is to tailor vanadium with earth-abundant and cheap elements (such as Fe, Mn), reducing the cost and toxicity of vanadium-based NASICON materials. Here, the Na V Fe (PO ) (NVFP) is synthesized with highly conductive Ketjen Black (KB) by ball-milling assisted sol-gel method. The pearl-like KB branch chains encircle the NVFP (p-NVFP), the segregated particles possess promoted overall conductivity, balanced charge, and modulated crystal structure during electrochemical progress. The p-NVFP obtains significantly enhanced ion diffusion ability and low volume change (2.99%). Meanwhile, it delivers a durable cycling performance (87.7% capacity retention over 5000 cycles at 5 C) in half cells. Surprisingly, the full cells of p-NVFP reveal a remarkable capability of 84.9 mAh g at 20 C with good cycling performance (capacity decay rate is 0.016% per cycle at 2 C). The structure modulation of the p-NVFP provides a rational design on the superiority of others to be put into practice.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10323620PMC
http://dx.doi.org/10.1002/advs.202301308DOI Listing

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