Fluorine-free gel polymer electrolyte for lithium oxide-rich solid electrolyte interphase and stable Li metal batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41120340.
- Also identified by DOI 10.1038/s41467-025-64345-7 and PMC identifier 12540845.
- Licence recorded as CC BY-NC-ND.
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Abstract
The development of stable solid-electrolyte interphases (SEI) represents a fundamental challenge for Li-metal batteries. Although fluorinated reagents improve cycling performance through LiF-rich SEI formation, their associated costs and environmental impacts remain problematic. Here, we present a fluorine-free quasi-solid polymer electrolyte that generates an O/N -containing hybrid SEI with improved interfacial stability and Li<sup>+</sup> transport kinetics. This unique SEI architecture preferentially directs Li deposition along the (200) crystallographic plane while enhancing charge-transfer efficiency. When implemented in Li | |LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> full cells, the fluorine-free gel polymer electrolyte enables a capacity retention of 84.7% over 800 cycles at 3 C. The fluorine-free gel polymer electrolyte system reported here exhibits improved high-rate performance compared to conventional fluorinated polymer electrolytes, providing a sustainable materials design paradigm for next-generation solid-state batteries.