Sodium-Ion Batteries Enabled by CoSn-LDH Microspheres Anchored on Few-Layer Ti₃C₂ MXene

Layered bimetallic hydroxide (LDH) has garnered significant attention due to its outstanding redox activity, making it a highly promising candidate as an anode material for sodium-ion batteries. In this study, a CoSn-LDH@MXene nanocomposite was skillfully fabricated through a one-step hydrothermal and ultrasonic treatment, involving the integration of CoSn-LDH microspheres onto Ti3C2 MXene nanosheets. CoSn-LDH was incorporated into the MXene interlayers via electrostatic adsorption, ensuring uniform dispersion, thereby preventing further MXene stacking and simultaneously increasing the interlayer distance. The exceptional electrical conductivity of MXene, combined with the abundant active sites provided by CoSn-LDH, synergistically enhances ion and electron transfer, resulting in the remarkable electrochemical performance of CoSn-LDH@MXene nanocomposites in sodium storage. An initial specific capacity of 976.1 mAh g(-1) was achieved at 0.1 A g(-1), with a remarkable capacity retention of 97.29% observed even after 100 cycles at 0.5 A g(-1). The superior electrochemical performance of the CoSn-LDH@MXene nanocomposites can be attributed to the synergistic interplay between the robust redox-active LDH structure and the highly conductive MXene network. These findings suggest that CoSn-LDH@MXene nanocomposites hold significant promise for the advancement of sodium storage materials.