Thin films (1 to 2μm) of amorphous solid electrolytes of the form, (1-x)LiBO2–xLi2SO4, (x = 0.4 to 0.8) were fabricated by radio-frequency magnetron sputtering. These compositions were beyond the glass-forming region which was accessible by conventional melt quenching. The ionic conductivity at room temperature increased with x-value, and exhibited a maximum of about 2.5 x 10-6S/cm at x = 0.7. At x > 0.7, the conductivity began to decrease; due to partial crystallization.

Thin Film Lithium Ion Conducting LiBSO Solid Electrolyte. K.H.Joo, P.Vinatier, B.Pecquenard, A.Levasseur, H.J.Sohn: Solid State Ionics, 2003, 160[1-2], 51-9