Carbon-coated Na3V2(PO4)3 nanocomposite as a novel high rate cathode material for aqueous sodium ion batteries

摘要: Abstract Aqueous rechargeable sodium ion batteries has attracted a lot of interests because its low cost, huge abundance resources and promising application for large-scale electric energy storage. Herein, we proposed the carbon-coated Na 3 V 2 (PO 4 ) nanocomposite (Na /C) as cathode material, which was prepared using simple sol–gel method. The structure morphology analyses showed that highly crystalline nanoparticle with an average size 350 nm is well coated by carbon layer thickness 3 nm. Electrochemical tests at high current rates, /C exhibited excellent electrochemical performance. Impressively, it delivered discharge specific capacity 94.5 mAh/g 10C (1176 mA/g), 90.5 mAh/g 15C (1764 mA/g) 71.7 mAh/g 20C (2352 mA/g). To best our knowledge, notable rate capability never been reported before aqueous batteries. enhanced behavior could be attributed to combined advantages nanoparticles in unique core–shell structure, improved intrinsic poor electronic conductivity greatly. Our results confirmed should candidate