Nanoscale Silicon Anodes and Solid Electrolyte Interfaces: A Materials Perspective

Nanostructuring has transformed silicon from a theoretically attractive but practically unworkable anode material into a leading candidate for next-generation lithium-ion and solid-state batteries. By controlling particle size, morphology, and composite architecture, researchers have substantially mitigated the mechanical degradation caused by silicon's large volumetric expansion. Yet the interfacial problem—the instability of the SEI in liquid electrolytes and the combined chemical and mechanical fragility of the electrode–electrolyte contact in solid-state systems—remains the central obstacle to commercialization. Progress will depend on continued integration across three fronts: scalable and sustainable nanoparticle synthesis, chemically tailored and mechanically resilient interphases suited to each electrolyte class, and cell-level engineering (stack pressure, electrode architecture, prelithiation) that connects particle-scale materials design to practical device performance. The convergence of these fronts, informed by increasingly sophisticated operando characterization and multiphysics modeling, positions nanoscale silicon anodes as a realistic near-term pathway to higher-energy-density, safer batteries.

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