Mono-Faceted Wo3-X Nanorods In Situ Hybridized In Carbon Nanosheets For Ultra-Fast/Stable Sodium-Ion Storage
JOURNAL OF MATERIALS CHEMISTRY A(2020)
摘要
The electrochemical properties of electrode materials have been markedly optimized by the introduction of geometric architectures and structural engineering. Nevertheless, the superior features of mono-faceted electrodes for anode properties in metal-ion batteries remain unexplored. Herein, facet-stacked WO3-x nanorods (NRs) are hybridized in situ in N-doped carbon nanosheets (CNSs) (WO3-x NRs/N-CNSs) via a facile self-polymerization and post-calcination approach. The N-CNSs create continuous conductive networks for rapid and stable ion/electron transport, and the WO3-x NRs with mono facets (010) can provide open and short-range ordered ion-diffusion pathways, which contain abundant dangling bonds and unsaturated active sites derived from the oxygen vacancies of nonstoichiometric WO3-x, thereby delivering superior reaction efficiency and robust structural stability for ultra-fast/stable sodium-ion storage. These findings are illustrated in detail using characterization techniques and density functional theory calculations. After 50 000 cycles, the WO3-x NRs/N-CNSs show a gratifying reversible capacity of 184.6 mA h g(-1), with an average charge time of 34.8 s and a high capacity retention of similar to 120% at 30.0 A g(-1). In particular, the WO3-x NRs/N-CNSs//Na3V2(PO4)(3) full-cells also display a high capacity of 112.5 mA h g(-1) after 300 cycles at 5.0 A g(-1). Therefore, combined with the in situ carbon compositing strategy, facet-stacked WO3-x NRs can provide a valuable basis for developing high-rate and ultra-long-life metal-ion batteries.
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关键词
carbon nanosheets,storage,mono-faceted,ultra-fast,sodium-ion
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