Reactions Between Deliathidated Cathodes and Electrolytes

The safety concern of lithium-ion batteries has been one of major technological barriers that hinder the deployment of lithium-ion batteries for automobile applications.  As an alternative to conventional thermal analysis techniques like differential scanning calorimetry and accelerating rate calorimetry, an in situ high energy X-ray diffraction technique was established to investigate the decomposition mechanism of delithiated cathode materials at thermal abuse conditions.  Figure 1 show a typical in situ high energy X-ray diffration data during the thermal abuse of delithated Li_1.2Ni_0.15Mn_0.55Co_0.1O₂.  In this talk, the mass/charge transfer throught the material interface will be disccused to illustrated the degration mechanism of delithiated cathode materials.