Synthesis and Electrochemical Performance of V(6)O(13) Nanosheets Film Cathodes for LIBs

V(6)O(13) thin films were deposited on indium-doped tin oxide (ITO) conductive glass by a concise low-temperature liquid-phase deposition method and through heat treatment. The obtained films were directly used as electrodes without adding any other media. The results indicate that the film annealed at 400 °C exhibited an excellent cycling performance, which remained at 82.7% of capacity after 100 cycles. The film annealed at 400 °C with diffusion coefficients of 6.08 × 10(−12) cm(2)·s(−1) (Li(+) insertion) and 5.46 × 10(−12) cm(2)·s(−1) (Li(+) extraction) in the V(6)O(13) film electrode. The high diffusion coefficients could be ascribed to the porous morphology composed of ultrathin nanosheets. Moreover, the film endured phase transitions during electrochemical cycling, the V(6)O(13) partially transformed to Li(0.6)V(1.67)O(3.67), Li(3)VO(4), and VO(2) with the insertion of Li(+) into the lattice, and Li(0.6)V(1.67)O(3.67), Li(3)VO(4), and VO(2) partially reversibly transformed backwards to V(6)O(13) with the extraction of Li(+) from the lattice. The phase transition can be attributed to the unique structure and morphology with enough active sites and ions diffusion channels during cycles. Such findings reveal a bright idea to prepare high-performance cathode materials for LIBs.