Abstract A phenothiazine derivative with high solubility in carbonate solvents containing lithium salts showed extensive overcharge protection and, as a result, has been evaluated catholyte for non‐aqueous redox flow batteries. We report the testing of 3,7‐bis(trifluoromethyl)‐ N ‐ethylphenothiazine and 2,3,6‐trimethylquinoxaline anolyte batteries 0.05, 0.15, 0.35 M active material found longest capacity retention over about 60 cycles at 0.15 . To our knowledge, this is most soluble...

Abstract Phenothiazine and five N ‐substituted derivatives were evaluated as electrolyte additives for overcharge protection in LiFePO 4 /synthetic graphite lithium‐ion batteries. We report on the stability reactivity of both neutral radical‐cation forms these six compounds. While three compounds show extensive protection, remaining last only one to a few cycles. UV/Vis studies redox shuttle radical cation form are consistent with performance: shuttles spectra that little change over time...

A variety of mechanisms lead to the failure lithium-ion batteries. One is overcharge, a condition in which battery's voltage rises above its designed end-of-charge potential. Electrolyte additives called redox shuttles limit cell potential by preferentially oxidizing, and cycling between cathode anode their radical cation neutral forms. Currently, testing requires coin assembly repeated cycling, can be an expensive time consuming process. It commonly accepted that degradation form shuttle...

3,7-Disubstituted N-ethylphenothiazine derivatives were synthesized as redox shuttle candidates for lithium-ion batteries. Battery cycling results show that three prevent overcharge.

Constant overcharging of LiFePO₄/synthetic graphite lithium-ion batteries in which the electrolyte additives 1,4-di-<italic>tert</italic>-butyl-2,5-dimethoxybenzene (DBB), <italic>N</italic>-ethylphenothiazine (EPT), and 3,7-bis(trifluoromethyl)-<italic>N</italic>-ethylphenothiazine (BCF3EPT) limit battery voltage.

Overcharge, a condition in which cell voltage rises to undesirably high potentials, can be prevented lithium-ion batteries by incorporating redox shuttles into the battery electrolyte. Although extensive overcharge protection has been demonstrated with LiFePO4 cathodes, that work these are incompatible higher cathodes. Designing stable additives oxidation potentials is necessary protect from overcharge. Toward goal, we synthesized diarylamines varied structures, including fused...

Extensive overcharge protection via redox shuttling in lithium-ion batteries has been limited by the solubility of stable electrolyte additives. Only a few compounds dissolve at concentrations above 0.1 M carbonate-based electrolytes. Here we report performance highly soluble shuttle 3,7-bis(trifluoromethyl)-N-ethylphenothiazine as high 1.0 M. The compound enables for hundreds hours rates 1C, and even M, normal battery function is not affected presence low charging rates. results on these...

<italic>N</italic>-Ethyl-3,7-bis(trifluoromethyl)phenothiazine is a highly soluble redox shuttle for overcharge protection in lithium-ion batteries with an oxidation potential of <italic>ca.</italic> 3.8 V <italic>vs.</italic> Li^+/0 carbonate solvents.

Abstract Block copolymers of cyclohexene oxide (CHO) and ketonic resin were prepared by using resins as free radical photoinitiators via two‐step procedure. In the first step, cyclohexanone–formaldehyde acetophenone–formaldehyde modified during their preparation with benzoin isobutyl ether. Then, AB or ABA type block depending on employed obtained irradiation these in presence pyridinium salt CHO a cationically polymerizable monomer. By this way, characterized GPC, DCS, FTIR, 1 H NMR...

3,7-Bis(trifluoromethyl)- N -ethylphenothiazine (BCF3EPT) is one of several derivatives phenothiazine prepared in our laboratory for evaluation as redox shuttles overcharge protection lithium-ion batteries. We varied alkyl substituents at the position and incorporated electron-withdrawing 3 7 positions. Derivatives with ethyl iso -propyl groups were most stable, those chloro trifluoromethyl robust overcharging BCF3EPT showed highest rate performance when dissolved 0.5 to 1.5 M 1.2 LiPF 6...

ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to "Controlling Oxidation Potentials in Redox Shuttle Candidates for Lithium-Ion Batteries"Selin Ergun, Corrine F. Elliott, Aman Preet Kaur, Sean R. Parkin, and Susan A. Odom*Cite this: J. Phys. Chem. C 2014, 118, 38, 22402Publication Date (Web):September 16, 2014Publication History Published online16 September 2014Published inissue 25...

In designing robust, effective redox shuttles for overcharge protection in lithium-ion batteries, a variety of factors are necessary to consider and evaluate. The stability reactivity the radical cation form shuttle candidate critical extensive performance. Radical cations subject reactions because their unpaired electron positive charge, making them nucleophilic attack dimerization, among other including disproportionation or premature reduction. Equally as important is neutral shuttle,...

Abstract not Available.