Safety Evaluation of Lithium Ion Secondary Batteries by using Ultramicroelectrodes and Infrared Microscopy

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Safety issue of lithium secondary batteries have been investigated. Unfortunately, the application of infrared microscopy to monitor the temperature increasement for microscopic scale would not work due to the interference by the thick electrolyte solution on the electrode. The application of microelectrode as the model for shorted circuit caused by the micro-particle of metals was also would not work due to the fused out of very thin Pt wire. According to the current interrupt technique, rate determining step of battery reaction was the ion transfer process of electrolyte solution. We also found that the carbon conductive agent include the Fe impurity. This Fe dissolve/precipitate at anode/cathode and makes shorted circuit throughout the separator.