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An environmentally-friendly solid electrolyte with stable interfacial SEI film boosting solid-state battery towards practical application
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DOI：10.1016/j.colsurfa.2025.136708.png)
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Abstract
En 中文
The performances, ease of manufacturing and cost of solid electrolytes determine the practical process of solid state battery. However, the current solid electrolytes generally have defects such as poor electrochemical performances, high fabrication cost, harsh requirements for manufacturing environment, and severe contamination due to the release of large amounts of organic solvents during the preparation process. In this work, a low-cost, environmentally-friendly polymer-based solid electrolyte was fabricated by using water-soluble polyether (F127) and lithium nitrate as lithium salt and water as solvent. The whole preparation process was free of organic pollutants and was completed in a conventional atmosphere. Further, the electrochemical performances of the solid electrolyte were enhanced by introducing ionic conductive LiAl5O8 (LAO) nanoparticle fillers. The ionic conductivity and electrochemical window of the electrolyte were up to 6.4 x 10-4 S cm-1 and 4.5 V respectively. The assembled LiFePO4/Li solid battery also displays good rate and cycling performances, which can be charged/ discharged at 2 C and stably cycled for more than 200 times at 0.5 C with 80 % capacity retention. This work proved that the low-cost water-soluble F127 and lithium nitrate can be used to prepare polymer electrolyte, and the LAO nanoparticles not only improved the ionic conductivity of solid electrolyte by reducing the glass transition temperature(Tg) and releasing more free lithium ions, but also improved the interface stability of electrolyte/lithium anode via forming Li-Al-O and Li-N hybrid solid electrolyte interphase (SEI) due to the synergistic reaction between LAO and NO3 - with lithium anode. This inexpensive, environmentally-friendly and easy manufacturing solid electrolyte provides new idea and technology for the industrialization development of solid-state battery.
Keywords:
Solid electrolyte
Environmentally-friendly
Water-soluble
Lithium aluminate
Journal
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4.7K
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