Electrical transport in Li_2SO_4-Li_2O-P _2O_5 ionic glasses and glass-ceramic composites: A comparative study

摘要

A comparative investigation carried out between glasses and glass-ceramics, in the system (Li_2SO_4)_x-(LiPO _3)_(1 - x), reveals interesting results. The conventionally melt-quenched compositions for x ≤ 60 mol% were found to be purely glassy in nature. The glass-ceramic composites obtained by crystallization of the glassy samples were found to be composed of fine nanocrystallites of LiPO_3 and Li_2SO_4 embedded in the glass matrix. The electrical conductivity, in both glasses as well as glass-ceramics, increases with Li _2SO_4 content and found to be maximum for a composition with 60 mol% of Li_2SO_4. Scaling of the conductivity spectra reveals that the relaxation dynamics of Li~+ ions is independent of temperature and composition for glasses as well as glass-ceramics. Further, the cyclic voltammetry investigations suggest a relatively better stability of glass-ceramic samples at least up to 300 C.