X-ray photoelectron spectroscopy for sulfide glass electrolytes in the systems Li 2 S–P 2 S 5 and Li 2 S–P 2 S 5 –LiBr

Abstract

X-ray photoelectron spectra of S2p and P2p were obtained for the xLi2S·(100-x)P2S5 (x = 70, 75 and 80 mol%) glasses prepd. by mechanochem. treatment. A peak deconvolution technique was used to sep. the S2p spectra into three sulfur components of bridging sulfur (S0), non-bridging sulfur (S-) and sulfide ion (S2-) with different photoelectron binding energies. The fractions of sulfurs at different electronic states were obtained from the area ratio of each peak. No apparent difference in the P2p spectra was obsd. in the glasses. In the (100-y)(0.7Li2S·0.3P2S5)·yLiBr (y = 0, 5, 10 and 20 mol %) glasses, the fractions of S0 and S- were almost the same in each glass regardless of the amt. of added LiBr content. The addn. of LiBr did not affect the electronic state of sulfur in the Li2S-P2S5-LiBr glasses. [on SciFinder(R)]