Approaching Microsized Alloy Anodes via Solid Electrolyte Interphase Design for Advanced Rechargeable Batteries

摘要

Microsized alloy anodes (Si, P, Sb, Sn, Bi, etc.) with high capacity, properworking potential, high tap density, and low cost are promising for breakingthe energy limits of current rechargeable batteries. Nevertheless, they sufferfrom large volume changes during cycling processes, posing a great challengein maintaining a thin, dense, and intact solid electrolyte interphase (SEI) layer.Recent progress suggests that the problematic SEI layer can be turned toadvantage in maintaining the integrity of microparticle anodes if welldesigned, which is expected to significantly boost the cyclic stability withoutresorting to complex electrode architectures. Advances in this attractivedirection are reviewed to shed light on future development. First, the keyissues of high-capacity microsized alloy anodes and the fundamentals of theSEI layer are discussed. Thereafter, progress on the regulation strategies ofSEI layers in high-capacity microsized alloy anodes for advanced rechargeablebatteries, including electrolyte engineering, electrode surface modification,cycle protocols, and electrode architecture design, are outlined. Finally,potential challenges and perspectives on developing high-quality SEI layersfor microsized alloy anodes are proposed.