Design of Ti4+-doped Li3V2(PO4)3/C fibers for lithium energy storage

In this work, we propose a facile approach to fabricate Ti4+-doped Li3V2(PO4)3/C (abbreviated as C-LVTP) nanofibers using an electrospinning route followed by a high temperature treatment. In this designed nanocomposite, the ultrafine LVTP dots are homogeneously dispersed into one-dimensional carbon nanofibers and the Ti4+ doping does not destroy the crystal structure of monoclinic Li3V2(PO4)3. Compared to the undoped Li3V2(PO4)3/C (abbreviated as C-LVP), the as-fabricated C-LVTP fibers present higher reversible capacity, superior high-rate capability as well as better cyclic property. Especially, the C-LVT7%P cathode delivers not only high capacities of 187.2 and 160.3 mAh g-1 at 0.5 and 10 C respectively, but also stable cyclic property with the reversible capacity of 135.8 mAh g- 1 at 20 C following 500-cycle spans. The good battery characteristics of CLVT7%P can be mainly ascribed to Ti4+ doping, which can increase the electrical conductivity and Li+ diffusion coefficient.

Automated summary

In this work, a facile method was proposed to fabricate Ti4+-doped Li3V2(PO4)3/C nanofibers, and the Ti4+ doping contributed to the improved electrical conductivity and Li+ diffusion coefficient, resulting in good battery characteristics.