Butanol Promoting High Graphitization in Carbon‐Supported Na 3 V 2 (PO 4 ) 3 for High‐Power Sodium‐Ion Battery with Long Life Cycle

Na 3 V 2 (PO 4 ) 3 (NVP) is an attractive cathode material for sodium storage because of its NASICON structure with high ionic conductivity and stability. However, its poor electronic conductivity and large volume change have limited its intensive application. Here, we use 1‐butanol as a co‐solvent to synthesize NVP (bNVP) microparticles with a uniform carbon coating layer. We discovered that butanol can effectively improve the graphitization level of the carbon, giving rise to a much higher electronic conductivity compared to the sample synthesized without butanol (pristine NVP, pNVP). As expected, bNVP demonstrates high reversible capacities of 110.3 mAh g −1 at 1 C, superior high‐rate performance of 98 mAh g −1 at 10 C, and enhanced cycling stability of 94 % capacity retention after 3500 cycles at 30 C, which are far better than pNVP, exhibiting great potential for high‐power sodium‐ion batteries.