(182h) Uniformly Dispersed FeTe2 Nanoparticles on Electrospun Nanofibers As Free-Standing Anodes for Sodium Ion Batteries

Sodium-ion batteries (SIBs) are increasingly being seen as a promising alternative to traditional lithium-ion batteries (LIBs), largely due to the abundance of sodium reserves and the high safety and relatively low cost of the material used in their production. However, like their lithium-ion counterparts, the anode materials in SIBs face a number of challenges that must be overcome before they can truly live up to their potential. Two key issues currently hindering the development of effective anode materials are sluggish electrochemical kinetics and a tendency for large volume expansion during the charge/discharge cycle. These factors not only impact the overall performance of the batteries, but also present significant challenges in terms of their long-term durability and reliability.
Tellurium, a metalloid with unique physical and chemical properties, exhibits exceptional stability and conductivity, making it an ideal material for a wide range of applications. Similarly, carbon fiber, renowned for its remarkable flexibility and conductivity, has emerged as a promising alternative to conventional current collectors. In this study, we successfully fabricated FeTe2@CNFs, a novel composite material, by employing a simple yet cost-effective approach. The method involves electrospinning a mixture of Te powder and specific precursors, followed by annealing at a controlled temperature. The result is a uniform dispersion of FeTe2 nanoparticles within the carbon fibers, a feat achieved through in-situ growth. These nanoparticles play a pivotal role in enhancing the overall capacity performance. The choice of iron and tellurides for this study was influenced by several factors. Iron, with its low cost and availability, was a logical option. On the other hand, tellurides, like their sulfide and selenide counterparts, offer superior conductivity and stability, making them ideal candidates for the development of novel materials. The distinctive CNFs structure, characterized by its high conductivity and vast exposed surface.