N-Ethyl-3,7-bis(trifluoromethyl)phenothiazine is a highly soluble redox shuttle for overcharge protection in lithium-ion batteries with an oxidation potential of ca. 3.8 V vs. Li+/0 in carbonate solvents. This compound has enabled extensive overcharge protection of LiFePO4/graphite cells and does so at high charging rates at high concentrations. Our initial synthesis of this compound suffered from low yields and difficult purifications. Here we report a cleaner, higher-yielding synthesis and additional characterization of the product and its stable radical cation salt.
|Number of pages||7|
|Journal||New Journal of Chemistry|
|State||Published - Jul 14 2020|
Bibliographical noteFunding Information:
We thank the National Science Foundation, Division of Chemistry for Award Numbers CHE-1300653 and CHE-1800482, and from support through an NSF EPSCoR grant, Award Number 1355438. Further, we the NSF for support through a Major Research Instrumentation grant through Award Number CHE-1626732.
© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
ASJC Scopus subject areas
- Chemistry (all)
- Materials Chemistry