Abstract

We report for the first time new Li + ion conducting thin film solid electrolytes based on Li–B–O–N system. Substitution of oxygen in xLi 2O–B 2O 3 ( x = 1, 3, 5) by nitrogen was successfully achieved by reactive sputtering under nitrogen plasma. FTIR and XPS analyses indicated that N atom was incorporated in the Li–B–O matrix film, and an increase in the composition of Li 2O together with N-substitution caused the structural conversion from ring-type borate to open structured one, where more free space and ionic bonding characteristic are offered for higher mobility of Li + ions. A high ionic conductivity of ca. 2.3 × 10 −6 S cm −1 at room temperature was obtained from the thin film electrolyte of Li 3.09BO 2.53N 0.52 glass that was prepared using 3Li 2O–B 2O 3 target. Electrochemical analyses suggest the high Li + ion conductivity is induced by the reduced activation energy through the control of the composition and the structure.

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