Controllable synthesis of Li3VO4/N doped C nanofibers toward high-capacity and high-rate Li-ion storage

Self-supported Li3VO4/N doped C fibers for superb high-rate and long-life Li-ion storage

“…However, the SS LVO/NC NFs deliver more obvious plateaus in the charge/discharge curves, implying higher reaction activity. 24,59 This could also be proved by the capacity variation as shown in Fig. 5b and d.…”

“…4e). The rate performances of the SS LVO/NC NFs are distinctly improved compared with other LVO-based electrodes reported in the literature (Table 2), 12,19,20,24,32,35,40,49,50,[52][53][54][55][56][57][58] and the low polarization and good repeatability of the representative charge/discharge curves (Fig. S8 †) demonstrate excellent durability of the LVO/NC NFs in rate performance tests.…”

“…2f 516.9 eV, corresponding to V 2p 1/2 /V 2p 3/2 of V 5+ and V 4+ spin orbitals, respectively. 21,24,34 Another peak at 523.6 eV stems from the O 1s satellite. 35 The presence of V 4+ in LVO may induce extra defects such as O vacancies in the crystal structure (i.e., Li 3 -VO 4Àx ), facilitating the electron and charge transfer.…”

“…The reversible capacity of the SS LVO/NC NFs is much higher than those of other LVO-based electrodes under a similar current (Table 1). 12,17,20,24,35,40,46,[50][51][52][53][54][55][56] Remarkably, the SS LVO/NC NFs could deliver excellent rate performance, under "Z" and "V" type tests. As shown in Fig.…”

“…Constructing a self-supported Li 3 VO 4 /C nanober electrode is promising to combine the merits of the local morphology (i.e., the improved reaction kinetics) and integral structure (i.e., the enhanced stability) more sufficiently, triggering better high-rate and long-life Li-ion storage. 19,[22][23][24][25] However, restricted by the compatibility between the polymer which is crucial for the exibility of the electrode and the rigorous conditions for the formation of Li 3 VO 4 , no report on freestanding Li 3 VO 4 /C electrodes has been reported up to now.…”