Thin film lithium ion conducting LiBSO solid electrolyte

K.-H. Joo (1) , Philippe Vinatier (2) , Brigitte Pecquenard (2) , Alain Levasseur (2) , H.-J. Sohn (1)

1 Research Center for Energy Conversion and Storage
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Thin films of 1–2 μm amorphous solid electrolytes, (1−x)LiBO2–xLi2SO4 (LiBSO), were fabricated by RF magnetron sputtering with a wide range of compositions, i.e. x=0.4–0.8, which are beyond the glass-forming region by conventional melt quenching method. The ionic conductivity of the electrolyte at room temperature increased with x and showed a maximum at x=0.7, about 2.5×10−6 S/cm. For higher x, (x>0.7), the conductivity began to decrease due to the partial crystallization. In addition, the electrolyte was stable up to 5.8 V vs. Li/Li+. LiBSO thin film electrolyte was incorporated into Li/TiS2 microbattery, showing a good cycling performance.

Mots clés: Lithium borate–lithium sulfate glass; Thin film electrolyte; RF sputtering; Glass-forming region; Microbattery

Domaines: Matériaux

K.-H. Joo, Philippe Vinatier, Brigitte Pecquenard, Alain Levasseur, H.-J. Sohn. Thin film lithium ion conducting LiBSO solid electrolyte. Solid State Ionics, 2003, 160 (1-2), pp.51-59. ⟨10.1016/S0167-2738(03)00163-2⟩. ⟨hal-00195921⟩