2022年1月1日 · X-ray diffraction (XRD) is a well-established tool for identifying the crystal structure and phase evolution of electrodes during charge/discharge cycling. Diffraction patterns containing structural information are generated by X-ray scattering of the long-range ordered atoms in a crystal.

Masquelier等 45 通过DSC曲线发现在介于α-NVP (C2c)和γ-NVP (R 3 c)相之间，存在两类过渡相，分别为β-NVP (30 -10 ℃)和β ′-NVP (125 -170 ℃)。 NVP相变位于 β -NVP和 β ′-NVP之间时，会出现不属于菱形对称的超结构衍射峰。

Among reported cathode candidates, Na3V2 (PO4)3 (NVP), a representative electrode material for sodium super ion conductor, has good application prospects due to its good structural stability,...

2023年12月25日 · Nanostructured Na 3 V 2 (PO 4) 3 @C exhibited capacity i.e. of 99 mAhg −1 at 1C. NVP demonstrated ultralong cycle life of 1400 cycles at 10C (73 mAhg −1) with 94 % capacity retention. Full cell comprising optimized NVP@C electrodes demonstrated cyclability of 500 cycles at 2C rate.

Figure5 shows in situ synchro- tron XRD patterns of the NVP@C electrode during charging and discharging. From the in situ synchrotron XRD results, the structuralt ransformation of NVP@Cd...

2023年5月12日 · These XRD patterns reveal that the NVP material undergoes a two-phase reaction from Na 3 V 2 (PO 4) 3 (black dashed line) to Na 1 V 2 (PO 4) 3 (grey dashed line) phase during the charging process, which is the origin of the variation of Na + diffusion coefficient.

2025年3月7日 · XRD analysis of lithiated NVP was conducted to investigate the success of the ion-exchange process and formation of r-LVP inside the coin cell. The cells were dismantled in an argon-filled glove ...

2013年10月31日 · High-energy batteries need significant cathodes which can simultaneously provide large specific capacities and high discharge plateaus. NASICON-structured Na 3 V 2 (PO 4) 3 (NVP) has been utilised as a promising cathode to meet

Crystal structures and 3D Li⁺/Na⁺ ion diffusion pathway of (b,c) NVP (R3‾ c) and (e,f) NVOPF (I4/mmm) phases with a geometry of VO6 octahedron (x=1, V³⁺, t2g²eg⁰) and VO5F octahedron (x=0, V⁴⁺,...

2016年5月12日 · The electrochemical assisted ex-XRD confirm that Li 3 V 2 (PO 4) 3 and Na 3 V 2 (PO 4) 3 are relative stable in aqueous electrolyte and Na 3 V 2 (PO 4) 3 showed more complicated electrochemical...