2-Amino-terephthalic acid derived N-doped CNTs to modify Na3V2(PO4)3 with enhanced pseudocapacitance behavior

Abstract

The compound Na3V2(PO4)3 (NVP) shows potential as a viable option owing to its notable stability and three-dimensional framework. Nevertheless, its effective use is impeded by its inadequate inherent electron conductivity. In this study, we have introduced a novel approach to overcome this limitation. We synthesized a Na3V2(PO4)3 material (NVP/C/N) coated with N-doped carbon nanotubes (CNTs) using 2-amino-terephthalic acid (NPTA) as the carbon source. The presence of the amino functional group serves a dual purpose: catalyzing the in-situ growth of a CNTs coating layer and incorporating N into the CNTs coating layer. When utilized as cathode materials, NVP/C/N exhibit exceptional rate capability, with discharge capacities of 108.8 mAh g−1 at 0.5C and 87.6 mAh g−1 at 50C, respectively, as well as remarkable cycling stability over long periods of time, maintains its capacity for 10,000 cycles at 50C, with only 0.00094 % capacity decay each cycle. The remarkable characteristics of this compound can be attributed to the enhanced conductivity and augmented active sites resulting from the coating layer of N-doped CNTs, as well as the enhanced pseudocapacitance behavior and reduced volume expansion during charge and discharge. Overall, this work holds immense potential for the advancement of energy storage systems that are both high-performing and reliable.