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Studies on film formation on cathodes using pyrazole derivatives as electrolyte additives in the Li-ion battery
Authors:Daewoong Kam  Ketack Kim  Hyun-Soo Kim  Hua Kun Liu
Institution:aBattery Research Group, Korea Electrotechnology Research Institute, Changwon 641-600, Republic of Korea;bEnergy Materials Research Program, Institute for Superconducting and Electronic Materials, ARC Centre for Electromaterials Science, University of Wollongong, NSW 2519, Australia
Abstract:Pyrazole derivatives are flame retardants and provide thermal protection on cathodes, as they help to form a thick protective film. A thicker film provides more protection and delays the thermal decomposition of the cathode. Among the tested pyrazoles, bis(trifluoromethyl)pyrazole (BFTMP) serves as the best flame retardant additive. Additionally, a cell with BFTMP shows better capacity retention than a cell with no additive in full-cell cycle life tests.
Keywords:Li-ion battery  Flame retardant additive  Pyrazole  Film formation  Cathode
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