Improved synthesis of: N -ethyl-3,7-bis(trifluoromethyl)phenothiazine

Selin Ergun, Matthew D. Casselman, Aman Preet Kaur, N. Harsha Attanayake, Sean R. Parkin, Susan A. Odom

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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.

Original languageEnglish
Pages (from-to)11349-11355
Number of pages7
JournalNew Journal of Chemistry
Issue number26
StatePublished - Jul 14 2020

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Materials Chemistry


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