Electrochemical Analyzing Method of the Charge Transfer Reaction at the Interface between Sulfide-based Solid Electrolyte and Positive Electrode Material with

The charge transfer reaction at the LiNbO3-coated LiCoO2/sulfide-based solid electrolyte interface was investigated with a Ni microelectrode. A two-electrode cell was assembled and two electrochemical measurements were performed in order to evaluate exchange currents at various temperatures and activation energy for charge transfer reaction (ECT) for positive electrode material. ECT at the LiNbO3-coated LiCoO2/solid electrolyte interface was evaluated to be 48 kJ mol-1. This value was smaller than ECT at the LiCoO2/organic electrolyte interface. In case of Li metal negative electrode, it has already found that ECT at the Li metal/solid electrolyte interface is smaller than ECT at the Li metal/organic electrolyte interface due to the lack of a desolvation process. Similar to this, it was demonstrated that the charge transfer reaction at the LiCoO2/solid electrolyte didn’t contain the desolvation process