用 EIS(Electrochemical Impedance Spectroscopy) 計算擴散係數(diffusion coefficient)
參考文獻資料: Appendix A. Supplementary data : SnO2/super P nanocomposites as anode materials for Na-ion batteries with enhanced electrochemical performance https://doi.org/10.1016/j.jallcom.2015.10.212