Graphene quantum dots for sodium-ion batteries: Mechanical stabilization and ion-active electrode design

Graphene quantum dots (GQDs) have emerged as multifunctional nanomaterials for sodium-ion batteries owing to their quantum-confined electronic structures, abundant edge-active sites, tunable surface chemistry, and strong interfacial adaptability. GQDs can simultaneously influence mechanical, ion-transport, and electronic processes, thereby supporting the development of mechanically resilient and ion-active electrode architectures. This review systematically examines the structural, electronic, and interfacial characteristics of GQDs and their influence on sodium-storage behavior. Particular emphasis is placed on the mechanistic relationships among stress redistribution, interfacial stabilization, active-site generation, ion–matter interactions, and charge-transfer regulation. Recent advances in GQD-engineered electrodes are critically analyzed with respect to interface engineering, defect and heteroatom functionalization, mechanical stabilization pathways, and structure–performance correlations. Importantly, this review establishes a unified framework linking mechanical stabilization and ion-active electrode design, two concepts that are often considered independently despite their intrinsic coupling. Current challenges, including mechanistic ambiguity, structural heterogeneity, limited operando understanding, and the lack of quantitative design descriptors, are discussed. Future opportunities in intelligent electrode engineering, multiscale characterization, and data-driven materials discovery are highlighted. By integrating fundamental mechanisms with experimental progress, this review provides design principles for the predictive development of next-generation GQD-engineered sodium-ion battery electrodes.

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