Improvement of High Rate Performances for Ti-Doped Li₃V₂(PO₄)₃ Cathode Materials

Abstract

Ti-doped lithium vanadium(III) phosphate cathode materials, Li 3−2x (V 1−x Ti x ) 2 (PO 4 ) 3 , were prepared by a solid state reaction. The Ti-doped samples exhibited that the γ-phase is stabilized at room temperature by substituting Ti for V sites at more than x = 0.10. The discharge capacity of the doped samples at a 60 C rate was found to be much higher than that for the non doped sample. This improved performance found for the doped cathodes was attributed to the increase in ionic conductivity given by the transition of α-to γ-phase via Ti substitution.

Enhancing electrochemical performance by triggering a local structure distortion in lithium vanadium phosphate cathode for Li ion batteries

“…The XRD pattern of LVP-P is very similar to that of LVP-P, and there is no characteristic peak of orthorhombic Li 2 Ti 2 (PO 4 ) 3 generally formed by Ti. 43 Fig. S2, Tables S1 and S2† show the Rietveld refinement analysis of LVP-P and LVP-T. 44 The unit cell lattice parameters of LVP-P are a = 8.609(5) Å, b = 8.594(5) Å, c = 12.039(5) Å, and V = 890.72(1) Å 3 , which are similar to those obtained in previous studies.…”

“…In the reports showing the effect of Ti atoms doped in the LVP materials, the oxidation state of Ti atoms is typically 4+ and the location is also at the sites of vanadium, as shown in our results. 37,41–43,45…”

“…In the reports showing the effect of Ti atoms doped in the LVP materials, the oxidation state of Ti atoms is typically 4+ and the location is also at the sites of vanadium, as shown in our results. 37,[41][42][43]45 In Fig. 3a, electrochemical voltage proles during the 1st cycle of LVP-P and LVP-T are plotted with a cutoff condition of 3.0-4.8 V at a current rate of 0.1C.…”

On the possibility of polystyrene-derived carbon coating for NASICON-type Na₃V₂(PO₄)₃ composites as cathode materials for sodium-ion batteries

“…18), 19) In addition to LFP, the effectiveness of the present synthesis technique was confirmed for NVP. Thus, this polystyrene-derived carbon coating method developed here represents a promising technique to improve the electrochemical properties of NVP and/or to design new active materials.…”

Ultralong lifespan of SuperRedox Capacitor using Ti-doped Li3V2(PO4)3 cathode with suppressed vanadium dissolution

“…This result aligns with previous studies, which reported improved rate capacities of Ti 4+substituted LVP due to enhanced Li diffusion through the formation of Li vacancies. 27,31,40,41 Therefore, the higher capacity observed in Ti-LVP than LVP can be attributed to improved rate properties resulting from Ti 4+ substitution and the formation of Li vacancies.…”