Electrochemical and thermal properties of 2,4,6-tris(trifluoromethyl)-1,3,5-triazine as a flame retardant additive in Li-ion batteries |
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Authors: | Ketack Kim Seyoung Ahn Hua Kun Liu |
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Affiliation: | a Battery Research Group, Korea Electrotechnology Research Institute, Changwon 641-600, Republic of Korea b Energy Materials Research Program, Institute for Superconducting and Electronic Materials, ARC Centre for Electromaterials Science, University of Wollongong, NSW 2522, Australia |
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Abstract: | Triazines are well known as flame retardants, however, their properties for battery applications have not been much explored. Flame retardants can play an important role in preventing dangerous situations that may occur when battery packs malfunction or are misused. However, the addition of flame retardants to batteries can degrade their performance due to the non-ionic properties of the additives. In order to overcome this drawback of additives, fluorinated material has been investigated, because fluorination frequently prevents deterioration of performance. A fluoride-rich triazine used as an additive to the electrolyte, 2,4,6-tris(trifluoromethyl)-1,3,5-triazine (TTFMT), showed excellent thermal stability with charged cathodes and anodes. Addition of 5 wt.% TTFMT to the electrolyte reduced the exothermic heat from the oxygen release reaction in the cathode by 54%. Surface film formation on the cathode is discussed with reference to cyclic voltammetry combined with impedance spectroscopy and differential scanning calorimetry. The properties of the film were influenced by the additive so as to markedly reduce the charge-transfer resistance, which enhanced the charge retention during cycle life, the capacity, and the high-rate discharge capacity of the battery. |
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Keywords: | Li-ion battery Flame retardant 2,4,6-Tris(trifluoromethyl)-1,3,5-triazine Additive Electrolyte |
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