Revealing the Intrinsic Origin for Performance-Enhancing V₂O₅ Electrode Materials

Revealing the intrinsic origin is critical for developing performance-enhancing V₂O₅ battery-type electrode materials. In this work, ultralong single-crystal V₂O₅ wires (W-V₂O₅) and V₂O₅ plate particles (P-V₂O₅) with similar physicochemical properties were compared to investigate the possible stimulative factors for pseudocapacitive enhancement. Our results indicate that besides the most-discussed specific surface area (or nanostructure), the enhanced electronic conductivity, the controllable interlamellar spacing distance, and the ion-transporting route as intrinsic origin also greatly affect their pseudocapacitive enhancement. First, the ultralong single-crystal wire structure can apparently enhance the electrons transport; second, the unique [001] facet orientation along the wire direction enlarges the interlamellar spacing distance and shortens the Li⁺ inserting route, thus facilitating the redox reactions by providing fast channels for charge carrier intercalation. Thus W-V₂O₅ showed much higher capacitance, better rate, and cycling capability than those of P-V₂O₅. This new insight presented here provides guidance for the design of V₂O₅ electrode materials and opens new opportunities in the development of high-performance battery-type electrode materials.