Fig. 3. The electrochemical performance of electrolytes. (a) The 1st–4th CV curves of the Na‖NVP battery in the electrolyte containing 2 wt% GA additive. (b) The LSV curves of the Na‖NVP battery in the three electrolytes. (c–e) The corresponding galvanostatic charge/discharge curves of the three Na‖NVP batteries at different cycles. The cycle performance of Na‖NVP batteries in different electrolytes (f) for 200 cycles at 0.5C and (g) for 500 cycles at 1C and (h) for 2500 cycles at 1C.