Below is a paragraph from an academic paper. Polish the writing to meet the academic style, improve the spelling, grammar, clarity, concision and overall readability. When necessary, rewrite the whole sentence. Output the full text after rewriting. Original paragraph: NVPF@rGO and NVPF as cathodes were examined for their electrochemical characteristics by the galvanostatic charge/discharge profiles and CV curves. The CV curves of NVPF@rGO at 0.1 mV s−1 between 2.5 and 4.3 V are displayed in Fig. 3a. Two pairs of redox peaks (3.62/3.58 V, 4.05/4.01 V) can belong to the desodiation/sodiation of Na3V2(PO4)2F3 (Na3V2(PO4)2F3 ↔ Na2V2(PO4)2F3 + Na+ + e−), and Na2V2(PO4)2F3 (Na2V2(PO4)2F3 ↔ NaV2(PO4)2F3 + Na+ + e−),[23] respectively. Notably, the peak positions and intensities of the four CV profiles maintain stability, demonstrating a high reversibility and stability of the material upon the repeated cycles. Fig. 3b depicts the initial charge/discharge profiles of NVPF@rGO and NVPF electrodes at 1 C (1 C = 128 mA g-1). The charge and discharge plateaus correspond to the redox peaks of the CV curves for NVPF@rGO. Remarkably, the potential gap between discharge and charge plateaus for NVPF@rGO is smaller than that for pure NVPF. NVPF@rGO represents a discharge capacity of 123 mAh g-1, corresponding to an initial Coulombic efficiency of 84% at 1 C, which is greater than the value of pure NVPF (84 mAh g-1, low Coulombic efficiency of 58%). After 50 cycles, the capacity of NVPF@rGO holds at 122 mAh g-1 with a capacity conservation ratio of 99% (Fig. 3c). NVPF@rGO also exhibits superior rate characteristics with the capacities of 122, 125, 124, 122, 120, 118, and 116 mAh g-1 at 1, 2, 5, 10, 20, 30, and 50 C in Fig. 3d, respectively. The charging time is only 1.2 mins at 50 C, demonstrating that this material is very suitable for fast-charging SIBs. Upon reversing the rate to 1 C, the capacity stabilizes at 123 mAh g-1. In contrast, NVPF only delivers a discharge capacity of 83, 77, 64, 53, 40, 30, 18, and 83 mAh g-1 at the same rates. Except for the high capacity, NVPF@rGO also maintains much better charge/discharge plateaus than NVPF along with the increase of current rates (Fig. 3e and 3f). Particularly, NVPF@rGO represents very competitive rate properties to NVPF-based materials in the previous papers (Fig. 3g and Table S2).[3, 21, 26, 30, 38, 44-51] Apart from that, NVPF@rGO exhibits preeminent long-term durability at a high rate. NVPF@rGO achieves a capacity of 107 mAh g-1 with a high capacity conservation ratio of 85.6% (capacity attenuation of 0.002% per cycle) after 7000 cycles at 10 C, which far exceeds the values of pure NVPF (38 mAh g-1 with capacity conservation ratio of 77.6% after 4000 cycles) (Fig. 3h). According to the above data, it can be concluded that NVPF coating with rGO can effectively improve its capacity, cycling stability, and rate characteristic. Moreover, compared with the NVPF@rGO prepared at various rGO addition (8-17%), microwave hydrothermal temperatures (120-140 ℃), microwave hydrothermal times (0.5-2 h), calcination times (4-10 h) and calcination temperatures (500-600 ℃), NVPF@rGO prepared at the condition of microwave hydrothermal temperature with 130 ℃, microwave hydrothermal time with 1 h, calcination temperature with 600 ℃, calcination time with 7 h, and the rGO content of 11% exhibits the superior cycle and rate performance owing to its lowest charge transfer impedance (30.4 Ω) shown in Fig. S11-S17 and Table S3-S4.