Abstract:

The anodic material of Li_1+xV₃O₈ was synthesized with Li₂CO₃ and NH₄VO₃ as the reactants under different conditions. The effects of the reactant dispersion and the calcining temperature on the structure, morphology and electrochemical properties of the products were investigated. XRD, IR and SEM experiments show that the sample synthesized at 550 ℃ from the precursor obtained with ultrasonically treating reactants in anhydrous ethanol has low crystallinity, small grain size and homogeneous morphology. And it has low polarization, more lithium insertion/extraction sites and good cyclability. Its discharge capacity reaches 268 mA·h/g in the 2nd cycle at a discharge rate of 0.5 C and still retains 210 mA·h/g after 100 cycles.

Key words: Li-ion batteries，Li_1+xV₃O₈ ，ultrasonic dispersal，solid-state reaction