Well-dispersed Na3V2(PO4)(2)F-3@rGO with improved kinetics for high-power sodium-ion batteries

摘要

Polyanion-type Na3V2(PO4)(2)F(3)with high potential is regarded as a promising cathode material for sodium-ion batteries. However, it usually shows low electronic and ionic conductivity, further leading to inferior rate capability. Here well-dispersed Na3V2(PO4)(2)F(3)nanoparticles were anchored on reduced graphene oxide (rGO)viaa facile precipitation process in an isopropanol-water mixed solvent. The Na3V2(PO4)(2)F-3@rGO composite exhibited apparently improved kinetics and further delivered high reversible capacity and outstanding high-rate performance. Furthermore, sodium-ion full cells composed of Na3V2(PO4)(2)F-3@rGO cathodes and hard carbon anodes presented high power density. This work offers a simple and scalable approach to boost the kinetics of polyanion-type cathodes for high-power alkali-ion batteries.