Microscopic mechanism of thermal cycle fatigue damage in high capacitance batteries

This study has revealed microscopic mechanism and criterion of crack initiation at electrode material that causes thermal cycle fatigue damage in high capacitance batteries. A series of static tensile tests and bending fatigue tests, multiscale analyses have been conducted and the followings are summarized. (1) The microscopic observation has clarified that binder supports microscopic structure of the electrode material. The macroscopic crack initiation at the electrode material is microscopic fracture of the binder. (2) The tensile strength and the S-N curve of the electrode material that is equivalent to the criterion of crack initiation at the electrode material can be estimated by the analysis technique in which the microscopic structure of the electrode material is approximated by simple crystal lattices.