Interface-Mediated Electrochemical Effects in Lithium/Polymer-Ceramic Cells (POSTPRINT)

This paper presents and discusses a method to achieve beneficial electrochemical effects mediated by interfaces in an ionic conducting polymer matrix. The beneficial effects include enhanced ionic transport, catalysis of anodic oxidation reaction, and stabilization of the lithium-electrolyte interface in lithium-based electrochemical cells. Polyethylene oxide PEO doped with LiN SO2CF2CF32 LiBETI was chosen as the ion conducting polymer matrix. The polymerceramic PC composite electrolytes from the PEOLiBETI-BN and PEOLiBETI-Li2O systems were optimized to achieve high conductivity, reduce charge-transfer resistance, and stabilize the solid electrolyte interface SEI layer at the lithium anode. Both BN and Li2O were effective in enhancing interface-mediated lithium ion transport. The charge-transfer resistance was reduced by orders of magnitude and the long-term stability of the cells was improved remarkably.