Electrospinning Synthesis of Porous NiCoO₂ Nanofibers as High‐Performance Anode for Lithium‐Ion Batteries

Abstract Nanostructured ternary/mixed transition metal oxides have attracted considerable attentions because of their high‐capacity and high‐rate capability in the electrochemical energy storage applications, but facile large‐scale fabrication with desired nanostructures still remains a great challenge. To overcome this, a facile synthesis of porous NiCoO 2 nanofibers composed of interconnected nanoparticles via an electrospinning–annealing strategy is reported herein. When examined as anode materials for lithium‐ion batteries, the as‐prepared porous NiCoO 2 nanofibers demonstrate superior lithium storage properties, delivering a high discharge capacity of 945 mA h g −1 after 140 cycles at 100 mA g −1 and a high rate capacity of 523 mA h g −1 at 2000 mA g −1 . This excellent electrochemical performance could be ascribed to the novel hierarchical nanoparticle‐nanofiber assembly structure, which can not only buffer the volumetric changes upon lithiation/delithiation processes but also provide enlarged surface sites for lithium storage and facilitate the charge/electrolyte diffusion. Notably, a facile synthetic strategy for fabrication of ternary/mixed metal oxides with 1D nanostructures, which is promising for energy‐related applications, is provided.