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

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.