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전기화학분극법에 의한 리튬 이온 전지의 열적 기계적 손상 평가
김재연(Jaeyeon Kim),유기태(Kitae Yoo),왕택립(Zeli Wang),임미나(Mina Lim),조소연(Soyeon Cho),김동오(Dongo Kim),이명훈(Myounghun Lee),변재원(Jaiwon Byeon) 한국신뢰성학회 2019 신뢰성응용연구 Vol.19 No.1
Purpose: Health and safety of lithium ion batteries have become important issue due to increasing reports on explosion and firing accident during use. In this research, mechanical and thermal damages of a lithium ion battery were evaluated by applying alternative current electrochemical impedance spectroscopy. Methods: Nyquist plot was obtained for the isothermally exposed batteries to 85℃, 100℃ and 120℃ as well as mechanically twisted and bended lithium polymer batteries, respectively. Ohmic, SEI (secondary electrolytic interface), and charge transfer resistance were extracted and compared among them. Results: Nyquist plot of both thermally exposed and mechanically deformed batteries were observed to shift toward high resistance region. SEI resistance value increased with thermal exposure, which is attributed to the decomposition reaction of lithium salt over 60℃. For the mechanically deformed battery, Ohmic resistance increased, while little change in SEI resistance was observed. Conclusion: SEI resistance and Ohmic resistance value extracted from the Nyquist plot can be applied as a state-of-health monitoring indicator of the lithium ion batteries used under thermal exposure or mechanical deformation condition, respectively.