Overcharge protection of lithium-ion batteries above 4 V with a perfluorinated phenothiazine derivative
2016
Kaur, Aman Preet | Casselman, Matthew D. | Elliott, Corrine F. | Parkin, Sean R. | Risko, Chad | Odom, Susan A.
Electron-withdrawing substituents are introduced onto the phenothiazine core to raise its oxidation potential for use as a redox shuttle in high-voltage lithium-ion batteries. A perfluorinated derivative oxidizes at 4.3 V vs. Li⁺/⁰, and functions for ca. 500 h of 100% overcharge in LiNi₀.₈Co₀.₁₅Al₀.₀₅O₂/graphite coin cells at a charging rate of C/10.
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