Characteristics and Electrochemical Performance of Hydroxyl-Functionalized Graphene Quantum Dot-Coated Si Nanoparticles/Reduced Graphene Hybrid Anodes for Advanced Li-Ion Batteries

By powering sophisticated lithium-ion batteries (LIBs), silicon/carbon (Si/C) composites have the potential to accelerate sustainable energy transition. This is a first-of-its-kind Si/C hybrid with hydroxyl-functionalized graphene quantum dots (OH-GQD) electrostatically assembled within interconnected reduced oxide networks (OH-GQD@Si/rGO) prepared through solution-phase ultrasonication and subsequent one-step, low-temperature annealing thermal reduction. The OH-GQD@Si/rGO utilized as LIB anode delivered high initial specific capacity of 2,229.16, 1,303.21, 1,090.13 mAh g−1 reversible capacities at 100 mA after 50 cycles, recovered 1,473.28 rates 5 A g−1. synergistic benefits OH-GQD/rGO interface give dual, conductive carbon protection silicon nanoparticles. Consecutive Si surface modifications improved Si–rGO contact modes. OH-GQD coating increased storage vacancy defects changing electron density in lattice, whereas hydroxyl functionality edges acted active sites. Secondary rGO encapsulation conductivity usage by providing continuous electron/ion routes while minimizing volume variations. proposed hybridization dual-carbon strategy stabilized solid electrolyte leading electrode stability. work expected advance development next-generation Si-based anodes.