Self-Assembled VS 4 Hierarchitectures with Enhanced Capacity and Stability for Sodium Storage

[摘要] Sodium-ion batteries (SIBs) have become an auspicious candidate for large-scale energy storage by cause of low cost, natural abundance, and similar working principle with lithium-ion batteries (LIBs). At present, there is an urgent need to explore superior anode materials with rapid and stable sodiation/desodiation. Herein, 3D self-assembled VS 4 curly nanosheets hierarchitectures (VS 4 -CN-Hs) are developed for SIB anodes, where VS 4 possesses a large theoretical sodium storage capacity, and the building block of nanosheets has large exposed surface area to the electrolyte as well as the constructed hierarchitectures can provide abundant buffer space to alleviate the volume expansion. As a result, VS 4 -CN-Hs anode possesses excellent electrochemical performance under a wide voltage window of 0.01–3.0 V, such as high reversible capacity of 863 mA h g −1 at 0.1 A g −1 , marvelous rate feature (444 mA h g −1 at 10 A g −1 ), and extralong cycle stability (386 mA h g −1 after 1000 times at 5 A g −1 ).

[关键词] 3D hierarchitecture;anode material;high rate capability;sodium-ion battery;vanadium tetrasulfide