Solid–Electrolyte Interface Formation on Si Nanowires in Li-Ion Batteries: The Impact of Electrolyte Additives

The morphological changes of Si nanowires (Si NWs) cycled in 1:1 ethylene–carbonate (EC)/diethyl–carbonate (DEC) with or without different additives, fluoroethylene carbonate (FEC) vinylene (VC), as well the composition deposited solid–electrolyte interphase layer, are investigated by a combination experimental microscopic and spectroscopic techniques. Scanning electron microscopy optical spectroscopy highlight that NW morphology is better preserved samples presence FEC VC additives compared to additive-free electrolyte. However, only use capable slightly mitigating amorphization silicon upon cycling. solid electrolyte (SEI) formed over NWs richer organic inorganic carbonates SEI grown additives. Furthermore, both able remarkably limit degradation LiPF6 salt. Overall, FEC-additive carbonate-based promotes structural resilience cycling thanks optimal layer.