A NASICON-based Na3V2(PO4)2F3 (NVPF) cathode material is reported herein as a potential symmetric cell electrode material. The symmetric cell was active from 0 to 3.5 V and showed a capacity of...

In this work, carbon nanotube–intertwined Na3V2(PO4)2F3 nanospheres (notated as NVPF@CNTs) are successfully synthesized by a solvothermal method and subsequent heat treatment.

2021年4月1日 · It is shown that the XRD patterns of both NVPF-4 and NVPF-2 are repeatable during two consecutive cycles at 0.5 C, indicating the good structural stability of the NVPF cathodes. For NVPF-4, we can observe the shift of diffraction peaks, and no diffraction peaks disappear nor new diffraction peaks appear.

2025年2月1日 · Sodium fluorophosphate-based Na 3 V 2 (PO 4) 2 F 3 (NVPF) cathode materials have been widely analyzed in Sodium-ion batteries (SIB) owing to their high energy density and high working voltage. However, the low electronic conductivity of NVPF is …

2022年11月4日 · 氟磷酸钒钠 [Na3V2(PO4)2F3，NVPF]正极材料具有稳定的三维框架结构、高的理论比容量 (128 mA·h/g)和高的工作电压 (约3.8 V)等优点，已成为近年来钠离子电池正极材料研究的热点。 然而，NVPF较低的电子电导率和较慢的离子扩散速率导致其实际比容量偏低且倍率性能不理想，阻碍了其进一步发展。 为此，研究者们通过优化NVPF的合成工艺，并采用包覆、离子掺杂和结构设计等方法对其进行改性，使其电化学性能得到了显著提升，极大增强了NVPF在钠 …

2024年5月15日 · The XRD pattern of HM-NVPF@CN-BPG after cycles further confirmed its structural stability (Fig. S19, Supporting Information). The resistance of HM-NVPF@CN-BPG gradually increased after 10 cycles and then remained stable even after 120 cycles (Fig. S20, Supporting Information). These results further demonstrate that the superior stability of ...

2024年11月5日 · In this study, we present an economical synthesis method to stabilize Na 3 V 2 (PO 4) 2 F 3 @C (NVPF@C) nanoparticles, which are encapsulated within a conductive reduced graphene oxide network (NVPF@C/rGO), serving as …

Na3V2(PO4)2F3 (简称为 NVPF)是由[V2O8F3]双 八面体和[PO4]四面体组成，沿着 a 和 b 轴方向，具 有开放的可脱嵌 Na + 通道，具有较快的钠离子扩散 速率。

Through in situ X-ray diffraction analysis of NVPF-PCNB-20, the results show that the modified Na3V2 (PO4)2F3 has excellent cycle reversibility. The scanning electron microscopy and transmission...

2021年3月31日 · The enlarged XRD pattern (Figure S1b) indicated the shift in the characteristic (002) peaks of the NVPF-Na x (x = 0.06, 0.07, 0.08, and 0.1) samples to a lower angle as compared to that for the (002) peaks of the pristine NVPF.