In-situ structural evolution analysis of Zr-doped Na3V2(PO4)2F3 coated by N-doped carbon layer as high-performance cathode for sodium-ion batteries

Particle nanosizing and coating with an ionic liquid: two routes to improve the transport properties of Na3V2(PO4)2FO2

“…In recent years, numerous methods such as the application of a carbon coating or the formation of composites with carbons (carbon nanotubes, reduced graphene oxides or amorphous carbons), [18][19][20][21] partial transition metal substitution (Al, Cr, Mn, Y, Zr, Ga, etc.) [22][23][24][25][26][27][28] and morphology design (flower, sand rose, nano/micro-sphere, nano/micro-cube, etc.) [29][30][31][32][33][34] have been proposed to overcome this problem.…”

Improved electrode kinetics of a modified Na3V2(PO4)3 cathode through Zr substitution and nitrogen-doped carbon coating towards robust electrochemical performance at low temperature

“…8,32,52,53 In principle, the small amount of Zr doping can effectively inhibit the crystal growth, alleviate the aggregation of the NVP nanoparticles, and induce the formation of a porous structure, thus providing a high surface area. 41,42 The larger specific surface area of 0.1Zr-NVP/ NC would guarantee sufficient contact between the electrode and electrolyte, hence resulting in improved reaction kinetics. [54][55][56] In order to obtain the NC contents of the as-prepared samples, TG measurements were conducted, and the results are shown in Fig.…”

“…50,63 To disclose the charge storage mechanism of the as-prepared samples, cyclic voltammetry (CV) curves, collected from 3a, where the well-maintained CV shapes and slight shifting of cathodic/anodic peaks show the weak voltage polarization and excellent electrochemical reversibility. 19,42 For comparison, the CV curves of NVP/NC, 0.05Zr-NVP/NC and 0.15Zr-NVP/NC have been depicted in Fig. S4a-c (ESI †).…”

“…Particularly, the relationship between the data collected at high frequency from the Nyquist plot and the Na + diffusion coefficient can be described as follows. 19,41,42…”

Advances of Metal Oxide Composite Cathodes for Aqueous Zinc‐Ion Batteries

“…[ 89 ] However, the inherent local electrostatic of the positive ions becomes successively high, and electrochemical behavior remains unresolved. Because of their substantially outstanding electrochemical characteristics, simple V‐oxides layered cathodes and the corresponding polyanionic substances including Na 3 V 2 (PO 4 ) 2 F 3 [ 90 ] and Na 3 V 2 (PO 4 ) 3 [ 91 ] are two promising candidates. However, both still confront issues (viz., storage decay) in the course of actual implementation.…”