Enhanced Reversible Capacity and Cyclic Performance of Lithium‐Ion Batteries Using SnO2 Interpenetrated MXene V2C Architecture as Anode Materials

Abstract

As an anode material, SnO2 nanoparticles have the problem of volume expansion and agglomeration, limiting their applications in energy storage. Herein, a nanocomposite material with hybridization structure using SnO2 interpenetrated MXene V2C as an anode for Li‐ion battery is fabricated by a simple method. The laminated structure of V2C can restrain the volume expansion of SnO2 nanoparticles anchored on the surface of V2C layers, whereas the intercalation of SnO2 nanoparticles into the V2CTx layer can effectively prevent the restacking of the V2CTx nanosheets in charging and discharging processes. This heterogeneous structure enables high Li‐ion storage on the surface and in the near‐surface region, which results in rapid transport of Li ions and optimizes the rate performance and cycling property. Consequently, the V2CTx@SnO2 nanocomposite has a large reversible capacity of ≈768 mAh g−1 after 200 cycles at a current density of 1000 mA g−1. Competitively, its reversible capacity can reach 260 mAh g−1 at high current density of 8000 mA g−1 after 1000 cycles, showing excellent cycling stability and superior rate capability. In addition to the high Li‐ion capacity offered by the composite structure, the anode also maintains the structural and mechanical integrity provided by MXene in charging and discharging processes.