Superior sodium intercalation of honeycomb-structured hierarchical porous Na3V2(PO4)3/C microballs prepared by a facile one-pot synthesis

摘要: Tailoring materials into a hierarchical porous micro/nanostructure offers unprecedented opportunities in the utilization of their functional properties. Particularly, it is crucial for electrode to realize high-performance because advantages such as large surface area, superior structure stability and short ion transport pathway. Here we report design new architecture, named “honeycomb-type microball”, Na3V2(PO4)3 by facile one-pot synthesis. The network between nanovoids formed situ carbonization surfactants (CTAB) along with crystallization Na3V2(PO4)3, which results skeleton conductive layer. prepared Na3V2(PO4)3/C composite consists spherical particles filled pores interconnective nanochannels, resulting honeycomb-type architecture. It not only enables easier electrolyte penetration, but also provides high-efficiency electron/ion pathway fast sodium intercalation. Both GITT EIS demonstrate improved diffusion capability decreased electrochemical resistance honeycomb-structured microball comparison microsized nonporous reference samples. Moreover, delivers high rate cycling stability, retains 93.6% initial capacity after 200 cycles at 1 C rate. Even 20 C, still 80.2 mA h g−1 corresponding 71% capacity. Given intercalation kinetics excellent puts forward strategy develop polyanion-based low-cost high-power “rocking-chair” batteries.