活物質の粒度分布を考慮した二次電池電極内部応力の解析

抄録

The stress due to structural change of the active material in the secondary battery was investigated. The model was constructed considering the parameters such as electrode size, constraint conditions and particle size distribution etc., and the stress analysis was conducted by using the finite element method. Stress distribution generated in the interface between the active material particles was quantitatively revealed, and it was considered that the cracking occurs in a continuous region of stress and strain are concentrated. Further, it was found that the shear stress at the interface between the collector film and the active material particle was able to be relieved by controlling the amount of binder. The influence of breaking stress and strain on deterioration of the electrodes was discussed by applying the measured real physical properties of the binder resins to the model, and as a result, it was suggested that the prediction of the relatively long electrode degradation behavior might be possible.