文摘
A large amount of conducting materials has typically been blended with transition metal oxides (MxOy, M = Fe, Co, Ni, Cu), and their electrochemical properties as the anode in lithium-ion batteries have been studied. Here, we report that a higher content of the conducting material results in poorer cycling stability of Co3O4. From the analysis of the cumulative irreversible capacity loss, a high content of conducting material is proven to promote irreversible electron consumption for the growth of a polymeric surface layer which is the origin of degradation. Furthermore, its formation is mathematically modeled on the basis of the Butler–Volmer relation. From the physical parameters of the polymeric surface layer determined by fitting the model to the experimental data, the degradation mechanism of Co3O4 is discussed. Keywords Conducting material Solid electrolyte interface Co3O4 Lithium-ion battery