Abstract
AbstractUsing cetyltrimethyl ammonium bromide (CTAB) as the surfactant, here we present the synthesis of lithium vanadium phosphate (LVP) Li3V2(PO4)/C by using a hybrid sol–gel method. Glucose, phenolic resin, and polyvinylidene fluoride (PVDF) are respectively used as the carbon sources for the three final products, LVP@GC, LVP@PR, LVP@PF. In addition, pure Li3V2(PO4), which is marked as LVP@0, was synthesized under the same conditions for comparison. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results indicate that LVP@PR and LVP@PF have particle sizes less than 0.5 μm. Li‐cycling studies are preformed in half‐cell over the potential range of 3.0–3.4 V. All four samples exhibited outstanding cycle performance, but the rate performances of LVP@0 and LVP@GC are worse than the other two. LVP@0 only delivers a discharge capacity of 40 mAh g−1 and LVP@GC delivers 70 mAh g−1 at 15 C [Li3V2(PO4) theoretical capacity=132 mAh g−1 over 3.0–3.4 V). LVP@PR and LVP@PF showed impressive electrochemical performance. LVP@PF delivered a near‐theoretical capacity at ≤2 C rate. At rates of 10 C and 15 C, the capacities of LVP@PR and LVP@PF are both above 90 mAh g−1 and LVP@PF is slightly higher than LVP@PR.
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