Hydrothermal Synthesis of Al/Cr-doped V₆O₁₃as Cathode Material for Lithium-ion Battery

Abstract

Abstract. Pure V6O13 and Al/Cr-doped V6O13 were synthesized via a hydrothermal route using C2H2O4·2H2O, V2O5, Al(NO3)3·9H2O and Cr(NO3)3·9H2O as raw materials. The products were characterized by XRD, SEM, EDS. Doping proven to be an effective method to improve the samples discharge specific capacity and cycle performance. Doping samples electrochemical performance were better than pure V6O13, the initial discharge specific capacity of sample 0.02 and 0.06 were 311mAh/g and 337mAh/g larger than pure V6O13 sample (241 mAh/g). The capacity retention of samples 0.00, 0.02, 0.06 was 32.0%, 44.69%, 28.78% after 100 cycles, respectively. The increased electrochemical performance originated from the enhanced of electrical conductivity and adhered together by stacking region in an regular arrangement with every unit.

Structure Rearrangement and V(IV) Doping for V2O5 as Ultralong-Life and Ultrahigh-Rate Cathode in Aqueous Zinc-Ion Batteries

“…However, the V(IV) doping enlarge the cell volume and lattice parameters due to the larger ionic radius of V 4+ (58.0 pm) than that of V 5+ (54.0 pm). [32][33][34] Based on the above analysis, the structural rearrangement and the V(IV) doping provide a larger lattice constant, which reduces the diffusion resistance of the ions and improve the electronic conductivity. Figure 2 displays the SEM and TEM images of V 2 O 5 nanosheets.…”