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 (CuFeSe2). The composites (CuFeSe2@CNTs) are synthesized by a hydrothermal method and examined for electrochemical performance as anode applications in LIBs. Herein, the CuFeSe2@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 FeSe2 and CuFeSe2 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 CuFeSe2 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. Metal selenides are widely considered as a new anode electrode material for lithium-ion batteries. Herein, heterogeneous metal selenide and carbon nanotube (CNT) composites (CuFeSe2@CNTs) are synthesized and applied as an anode material for lithium-ion batteries. Additionally, the role of CNTs is revealed by manufacturing and comparing the ion kinetics during charge storage of single-metal selenides (FeSe2) and heterogeneous metal selenides (CuFeSe2).image (c) 2024 WILEY-VCH GmbH