Duration of daily VDT use was linearly related to the physical symptom score, and was non-linearly related to mental and sleep-related symptom score with a threshold effect of 5 hr/day.

were confirmed. The solid solutions showed ionic conductivities from 4.14  10 −5 to 2.64  10 −4 S cm −1 at 298 K and a wide electrochemical window of 0-5.0 V (vs. Li/Li +). Among the solid solutions synthesized, the purest phase had the composition Li 3.35 P 0.93 S 3.5 O 0.5 (x = 0.07, z = 0.5). Structural analysis revealed that the novel oxysulfides are isostructural to the original Li 10 GeP 2 S 12 structure and the (P/)(S/O) 4 tetrahedra, which indicates the presence of cation defects with oxygen substitution in the crystal structure. Electrochemical stability of the oxysulfides was confirmed in the voltage range of 0-5.0 V. The solid-electrolyte interphase (SEI) resistivity and its cycle-dependence evaluation for new materials demonstrated that the oxysulfides had lower resistivities and furnished well-contacted SEI layers during the charge-discharge process.

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