title: Graphene-Scaffolded Na3V2(PO4)3Microsphere Cathode with High Rate Capability and Cycling Stability for Sodium Ion Batteries.
abstract: High voltage, high rate, and cycling-stable cathodes are urgently needed for development of commercially viable sodium ion batteries (SIBs). Herein, we report a facile spray-drying method to synthesize graphene-scaffolded Na3V2(PO4)3microspheres (NVP@rGO), in which nanocrystalline Na3V2(PO4)3is embedded in graphene sheets to form porous microspheres. Benefiting from the highly conductive graphene framework and porous structure, the NVP@rGO material exhibits a high reversible capacity (115 mAh g-1at 0.2 C), long-term cycle life (81% of capacity retention up to 3000 cycles at 5 C), and excellent rate performance (44 mAh g-1at 50 C). The electrochemical properties of a full Na-ion cell with the NVP@rGO cathode and Sb/C anode are also investigated. The present results suggest promising applications of the NVP@rGO material as a high performance cathode for sodium ion batteries.
authors.affiliation: Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Jiexin
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Yongjin
authors.initials: Y
authors.lastname: Fang
authors.affiliation: College of Chemistry, Central China Normal University , Wuhan, Hubei 430079, P. R. China.
authors.forename: Lifen
authors.initials: L
authors.lastname: Xiao
authors.affiliation: Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Jiangfeng
authors.initials: J
authors.lastname: Qian
authors.affiliation: Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Yuliang
authors.identifier: http://orcid.org/0000-0001-6092-5652
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Xinping
authors.initials: X
authors.lastname: Ai
authors.affiliation: Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University , Wuhan, Hubei 430072, China.
authors.forename: Hanxi
authors.initials: H
authors.lastname: Yang
keywords: Na3V2(PO4)3/rGO microsphere; cathode; graphene; sodium ion batteries; spray-drying synthesis