An innovative electrolyte for promising Si-based anode materials for Li-ion and post-Li-ion batteries is studied. Silicon features a tenfold theoretical specific capacity compared to graphite, although it presents the intrinsic disadvantages of a severe volume expansion during lithiation (about 300%), that undermines the lifetime of the device. The combination of a newly formulated electrolyte with an active material consisting of silicon nanoparticles incorporated into β-cyclodextrins-based nanosponges matrix and reduced graphene oxide permits to overcome Si-related issues. Starting from a mixture of ethers typical of Li-S cells, devised to obtain an electrolyte suitable for a future high energy and high capacity Si-S cell, FEC 5 wt% is used and electrochemical tests show markedly improved performance with respect to VC-based standard electrolytes. XRD, EIS and CV studies highlight an increased activation of silicon and a less resistive SEI layer. Overall, a favorable interaction of the newly formulated electrolyte with the nanosponges-based matrix leads to more durable and efficient cells.

Li-ion batteries with silicon anodes: study of innovative electrolytes based on carbonates / Mangini, A.; Alidoost, M.; Versaci, D.; Fagiolari, L.; Amici, J.; Bella, F.; Francia, C.; Bodoardo, S.. - (2021). ((Intervento presentato al convegno 72th Annual ISE Meeting tenutosi a Virtual meeting nel 29 August – 3 September 2021.

Li-ion batteries with silicon anodes: study of innovative electrolytes based on carbonates

A. Mangini;M. Alidoost;D. Versaci;L. Fagiolari;J. Amici;F. Bella;C. Francia;S. Bodoardo
2021

Abstract

An innovative electrolyte for promising Si-based anode materials for Li-ion and post-Li-ion batteries is studied. Silicon features a tenfold theoretical specific capacity compared to graphite, although it presents the intrinsic disadvantages of a severe volume expansion during lithiation (about 300%), that undermines the lifetime of the device. The combination of a newly formulated electrolyte with an active material consisting of silicon nanoparticles incorporated into β-cyclodextrins-based nanosponges matrix and reduced graphene oxide permits to overcome Si-related issues. Starting from a mixture of ethers typical of Li-S cells, devised to obtain an electrolyte suitable for a future high energy and high capacity Si-S cell, FEC 5 wt% is used and electrochemical tests show markedly improved performance with respect to VC-based standard electrolytes. XRD, EIS and CV studies highlight an increased activation of silicon and a less resistive SEI layer. Overall, a favorable interaction of the newly formulated electrolyte with the nanosponges-based matrix leads to more durable and efficient cells.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2951978