Vanadium-doped TiO2-B/anatase mesoporous nanotubes with improved rate and cycle performance for rechargeable lithium and sodium batteries
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第19期
论文作者：D.P.Opra S.V.Gnedenkov A.A.Sokolov A.B.Podgorbunsky A.Yu.Ustinov V.Yu.Mayorov V.G.Kuryavyi S.L.Sinebryukhov
文章页码：181 - 189
摘 要：TiO2-B/anatase nanotubes doped by vanadium have been synthesized through a facile one-step hydrothermal reaction. The material shows a mesoporous structure with a specific surface area of 179.1 m2g-1. XPS data presume the presence of V3+, V4+, V5+, and Ti3+in doped TiO2-B/anatase. As found by XRD and EIS investigations, the vanadium expands bronze titania crystal structure and enhances the conductivity of material by three orders of magnitude. When tested for lithium storage, the V-modified titania nanotubes show a specific capacity of 133 mA h g-1 after 100 charge/discharge cycles at the current density of 3000 mA g-1 with a Coulombic efficiency of around 98.9%, resulting in its good cycleability.The material still possesses a reversible capacity of 114 mA h g-1 at a very high current load of 6000 mA g-1, demonstrating superior rate characteristics for secondary lithium batteries. Furthermore, V-doped Ti O2-B/anatase mesoporous nanotubes show promise performance as anode material for sodium-ion batteries, delivering about 119 mA h g-1 and 101 m A h g–1 at the current loads of 10 and 1500 m A g–1,respectively.
D.P.Opra1，S.V.Gnedenkov1，A.A.Sokolov1,2，A.B.Podgorbunsky1，A.Yu.Ustinov1,2，V.Yu.Mayorov1，V.G.Kuryavyi1，S.L.Sinebryukhov1
1. Institute of Chemistry FEB RAS2. Far Eastern Federal University
摘 要：TiO2-B/anatase nanotubes doped by vanadium have been synthesized through a facile one-step hydrothermal reaction. The material shows a mesoporous structure with a specific surface area of 179.1 m2g-1. XPS data presume the presence of V3+, V4+, V5+, and Ti3+in doped TiO2-B/anatase. As found by XRD and EIS investigations, the vanadium expands bronze titania crystal structure and enhances the conductivity of material by three orders of magnitude. When tested for lithium storage, the V-modified titania nanotubes show a specific capacity of 133 mA h g-1 after 100 charge/discharge cycles at the current density of 3000 mA g-1 with a Coulombic efficiency of around 98.9%, resulting in its good cycleability.The material still possesses a reversible capacity of 114 mA h g-1 at a very high current load of 6000 mA g-1, demonstrating superior rate characteristics for secondary lithium batteries. Furthermore, V-doped Ti O2-B/anatase mesoporous nanotubes show promise performance as anode material for sodium-ion batteries, delivering about 119 mA h g-1 and 101 m A h g–1 at the current loads of 10 and 1500 m A g–1,respectively.
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