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In relation to this article, we declare that there is no conflict of interest.
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Received November 16, 2001
Accepted March 14, 2002
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Redox Shuttle Additives for Chemical Overcharge Protection in Lithium Ion Batteries

Materials & Devices Lab., Samsung Advanced Institute of Technology, P.O.Box 111, Suwon 440-600, Korea 1CSE Center, Samsung Advanced Institute of Technology, P.O.Box 111, Suwon 440-600, Korea
Korean Journal of Chemical Engineering, July 2002, 19(4), 645-652(8), 10.1007/BF02699311
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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_x000D_ 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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