X-ray photoelectron spectroscopy for sulfide glass electrolytes in the systems Li2S–P2S5 and Li2S–P2S5–LiBr

摘要

X-ray photoelectron spectra of S_2p and P_2p were obtained for the x Li₂S·(100 ? x )P₂S₅ ( x = 70, 75 and 80 mol %) glasses prepared by mechanochemical treatment. A peak deconvolution technique was used to separate the S_2p 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 P_2p spectra was observed in the glasses. In the (100 ? y )(0.7Li₂S·0.3P₂S₅)· y LiBr ( y = 0, 5, 10 and 20 mol %) glasses, the fractions of S0 and S? were almost the same in each glass regardless of the amount of added LiBr content. The addition of LiBr did not affect the electronic state of sulfur in the Li₂S–P₂S₅–LiBr glasses.