In Situ Hydrogen Bonding‐Mediated Self‐Synthesis of Graphene‐Coated SnO2 as Anode Materials for Lithium‐Ion Batteries

Abstract

Tin(IV) oxide (SnO2) has been recognized as the next frontier in innovative anode materials, set to revolutionize lithium‐ion batteries. Anticipated to replace graphite anodes, SnO2 boasts an ideal capacity of 782 mAh g−1 and an appropriate operating potential conducive to advanced battery technology. Nonetheless, the challenges posed by volume expansion and intricate synthesis route of Sn‐based anode materials have impeded their commercial viability. Herein, SnO2@graphene nanoparticles are synthesized through hydrogen bonding‐mediated self‐assembly process, utilizing polyethylene glycol (PEG) and tin tetrachloride as starting materials. The resultant nanoparticles exhibit uniform distribution, forming a sandwich structure with graphene. Sample SP‐0.3, obtained by incorporating 6 g of PEG, demonstrates remarkable capacity for reversible energy storage. It retains a capacity of 703.1 mAh g−1 even after 900 cycles at a current density of 0.5 A g−1. Coupled with the straightforward, convenient, and expeditious preparation method, the proposed technique positions the composite material as an invaluable candidate for commercialization.