Abstract
We disclosed that a few kinds of aromatic compounds having thianthrene derivatives with acetyl or other functional groups were stable up to about 4.2-4.3 V against lithium. These materials, called redox shuttle, have lately been employed as a chemical overcharge protection agent that consumes the excess current during battery overcharge. They oxidized above 4 V and worked as redox shuttle when introduced into the electrolyte of a Carbon/LiCoO2 prismatic battery within less than one hour rate (1C). We also studied thermal properties of batteries containing the above-mentioned materials with ARC (Accelerating Rate Calorimeter). We ascertained that the current supplied over the full charge was not stored, but instantly and quite completely consumed in an oxidation-reduction reaction.
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Lee, DY., Lee, HS., Kim, HS. et al. Redox shuttle additives for chemical overcharge protection in lithium ion batteries. Korean J. Chem. Eng. 19, 645–652 (2002). https://doi.org/10.1007/BF02699311
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DOI: https://doi.org/10.1007/BF02699311