Key Messages

Structural and kinetic behavior of lithium-vanadium-oxide (LixV3O8) cathode is studied as lithium-ion battery electrode. The morphology of LixV3O8is found to be nanoplates with nanorods as minor constituents. Theoretical prediction shows such a nanoplate morphology will have almost thirty four times faster lithium diffusion than spherical particle of same volume. In the present study, experimental and theoretical observation of Fourier transform infrared spectroscopy (FT-IR) is compared to investigate the vibrational mode of V-O bond. LixV3O8cathode, delivers a high discharge capacity of 270 mAh g1at 200 mA g1and as high as 200 mAh g1, 135 mAh g1, and 100 mAh g1at 1000 mA g1, 2000 mA g1, and 3000 mA g1current rates respectively. A detailed electrode kinetic study using galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy (EIS) are performed to establish the relationship between high rate capability with kinetic parameters. The diffusion co-efficient (DLithium) value of LixV3O8is estimated to be ∼ 10151013cm2s1and 10131011cm2s1in the single phase region (0 ≤ x ≤ 1.7) during discharge and charge processes respectively. Further, ex situ XRD is performed on LixV3O8cathode material to study the phase transformation during charge/discharge process.

Phase transition, electrochemistry, and structural studies of high rate Lix V3O8 cathode with nanoplate morphology