Constructing oxygen-deficient V2O3@C nanospheres for high performance potassium ion batteries

Controllable Synthesis of Skeletonized V2O5 Microspheres Derived from a V-MOF for Aqueous Zinc-Ion Batteries

“…The vanadium metal− organic framework (V-MOF) spheres were prepared using the previously reported method. 26 First, 2.3 mmol of vanadyl acetylacetonate VO(acac) 2 and 3 mmol of 1,4-benzenedicarboxylic acid (BDC) were dissolved in 50 mL of ethanol (Ar, ≥99.8%), and they were stirred continuously for 20 min and sonicated for 10 min for a green transparent solution. After that, the above solution was placed in a 100 mL Teflon-lined autoclave for 12 h at 180 °C.…”

Vanadium fluorophosphates: advanced cathode materials for next-generation secondary batteries

“…[11][12][13][14][15][16][17][18][19][20][21][22] Nevertheless, their comprehensive performance cannot match that of LIBs at present mainly owing to the larger radius of Na + (B1.02 Å) and K + (B1.38 Å) than Li + (B0.76 Å), making it more difficult for Na + /K + to diffuse in/out of the electrodes. [23][24][25][26][27][28][29][30][31][32] Nowadays, the commercialization of SIBs/PIBs is hindered by their low energy density and inferior cycling stability. Firstly, the phenomenon of low energy density primarily originates from the high redox potential of Na/Na + (K/K + ) and their high atomic mass, and thus the SIB/PIB cathode materials will lose 15-20% of their theoretical energy density compared to LIBs.…”