Mo−O−Sn Bond Boosting Kinetics of MoO₂−xSnO₂/Sn Anode for High‐Performance Li‐ion Batteries

Abstract

Obtaining a robust electrode composed of Sn‐based metal oxides and carbonaceous matrix through nanoscale structure engineering is essential for effectively improving Li‐ion batteries' electrochemical performance and stability. Herein, we report a bimetallic MoO2‐xSnO2/Sn nanoparticles uniformly anchored on N, S co‐doped graphene nanosheets (MoO2‐xSnO2/Sn@NSG) as an anode electrode for Li‐ion battery via a one‐step hydrothermal and thermal treatment approach. In the MoO2‐xSnO2/Sn nanocomposite, the generated Sn‐O‐Mo bond can modulate the electronic and composition structures to improve the intrinsic conductivity of SnO2 and reinforce the structural stability during cycles. Moreover, featuring excellent electronic conductivity via coupling of MoO2‐xSnO2/Sn and hierarchical NBG matrix, the MoO2‐xSnO2/Sn@NSG electrode possesses ultrafast electrochemical kinetics and superior long‐term cycling stability and rate capability. Additionally, the hierarchical MoO2‐2SnO2/Sn@NSG can suppress the aggregation and accommodate the volume variations of active substances, thereby providing more lithium storage sites. Consequently, the optimized MoO2‐2SnO2/Sn@NSG anode exhibits a high reversible capacity of 904 mA h g‐1 at 0.2 A g‐1 and excellent cycling performance with the reversible capacity of 456 mAh g‐1 at 1 A g‐1 over 600 cycles. The universal synthesis technology of bimetallic oxide anodes for advanced LIBs may provide vital guidance in designing high‐performance energy‐storage materials.