Copper–Iron Selenides Nanoflakes and Carbon Nanotubes Composites as an Advanced Anode Material for High‐Performance Lithium‐Ion Batteries

Metal selenides are widely considered as an emerging anode electrode material for lithium‐ion batteries (LIBs). Hence, the present study uses a conductive carbon materials matrix such as carbon nanotubes (CNTs) with copper–iron selenide (CuFeSe 2 ). The composites (CuFeSe 2 @CNTs) are synthesized by a hydrothermal method and examined for electrochemical performance as anode applications in LIBs. Herein, the CuFeSe 2 @CNTs show excellent specific capacity of 783.7 and 720.6 mA h g −1 at 0.1 and 1 A g −1 , respectively. This composite further exhibits a high‐capacity value compared to only FeSe 2 and CuFeSe 2 and a reversible capacity of 691 mA h g −1 after 200 cycles at 1 A g −1 current density. Moreover, the homogeneous combination of CuFeSe 2 nanoflakes and CNTs provides structural stability that reduces the volume change during lithium‐ion interactions and successively improves the conductivity of the complex, which is advantageous for better ion and electron kinetics during the reaction.