Screening of F-containing electrolyte additives and clarifying their decomposition routes for stable Li metal anodes.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39528462.
- Also identified by DOI 10.1038/s41467-024-53807-z and PMC identifier 11555052.
- Licence recorded as CC BY-NC-ND.
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Abstract
Constructing a LiF-rich solid electrolyte interphase (SEI) is a feasible strategy for inhibiting lithium (Li) dendrites of Li metal anodes (LMAs). However, selecting appropriate F-containing additives with efficient LiF contribution is still under active research. Herein, a series of fluorinated additives with diverse F/C molar ratios are investigated, and we demonstrate that the hexafluoroglutaric anhydride (F<sub>6-0</sub>) holds the best capability to derive the LiF-rich SEI in regular carbonate electrolytes (RCEs). To ameliorate the decomposition kinetics of the F<sub>6-0</sub>, LiNO<sub>3</sub> (LNO) as an adjuvant is further introduced in the system. As a result, the reduction efficiency of F<sub>6-0</sub> is increased to 91% under the F<sub>6-0</sub>/LNO synergistic effect, enabling the LMA with a uniform LiF-rich SEI in the RCE with merely 4 vol. % F<sub>6-0</sub>/LNO (F6L) addition. The LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub>||Li-20μm full-cell with the F6L also showcases better cycling and rate performances than the cases with other F-containing additives.