Intercalation of bismuth nanoparticles into Ti3C2 MXene as an anode material for lithium-ion batteries

Abstract

Bismuth (Bi) metal is considered an ideal anode material for lithium-ion batteries (LIBs). However, its poor structural stability during cycling, caused by expansion and cracking, remains a significant challenge. Here, we design a Bi/MXene composite via a one-step reduction process, to address these issues. Bi nanoparticles are uniformly incorporated into Ti₃C₂ MXene layers, enhancing structural stability and preventing agglomeration. The Bi/MXene nanosheet delivers an exceptional specific capacity, exceeding 300 mAh g⁻¹ over 500 cycles at 1.0 A g⁻¹. Its electrochemical performance is controlled by both ion-diffusion and pseudocapacitive mechanisms, ensuring outstanding cycling performance.