Coupling of S@aerogel and Si/SiOx Nanospheres Electrodes with “Polysulfide” Salt-Free Electrolytes in a Fluorine-Free Lithium-Ion Batteries
Journal article, 2025
Li-ion batteries play a pivotal role in powering electric vehicles and storing renewable energy. To enable their widespread adoption, it is imperative to explore new materials that reduce costs and enhance energy density. Sulfur and silicon exhibit promising characteristics as cathodes and anodes, respectively, and perform well in Li half-cells. However, their effective coupling in Li-ion configurations presents challenges. A major hurdle lies in identifying an electrolyte that ensures stable interphases and prolonged cycling while prioritizing safety and cost-effectiveness. This study introduces a groundbreaking approach by customizing a “salt-free” electrolyte solution compatible with both Li/sulfur and Li/silicon cells. The innovation involves dissolving lithium polysulfide in a diglyme solvent to facilitate Li-ion transfer. This improves cell safety due to the low flammability of the solvent and the absence of fluorine, while also ensuring faster Li-ion transport and prolonged stability of the solid electrolyte interphase. By integrating this tailored electrolyte with engineered electrodes, including a free-standing reduced graphene oxide aerogel with ≈74% sulfur and high areal capacity Si/SiOx nanospheres, a unique “salt-free” Li-ion battery configuration is demonstrated. The findings present a promising avenue for developing cost-effective, safe, high-performance lithium-ion batteries.
sulfur/silicon electrodes
fluorine-free lithium-ion batteries
“salt-free” electrolyte
solid electrolyte interphase stability
Author
Marco Agostini
Chalmers, Physics, Materials Physics
Sapienza University of Rome
Jang Yeon Hwang
Hanyang University
Piotr Jankowski
Warsaw University of Technology
Hyeona Park
Hanyang University
Chaiwon Lee
Hanyang University
Hansu Kim
Hanyang University
Shizhao Xiong
Chalmers, Physics, Materials Physics
Carmen Cavallo
University of Oslo
Arcangelo Celeste
Sapienza University of Rome
Sang Gil Woo
Korea Electronics Technology Institute
Jinhua Sun
Chalmers, Industrial and Materials Science, Materials and manufacture
Sergio Brutti
Sapienza University of Rome
Yang Kook Sun
Hanyang University
Aleksandar Matic
Chalmers, Physics, Materials Physics
Small Structures
26884062 (eISSN)
Vol. In PressSubject Categories (SSIF 2025)
Materials Chemistry
Inorganic Chemistry
Condensed Matter Physics
DOI
10.1002/sstr.202500096