Abstract
Measurements on conductivity and Li charge-discharge efficiency in various propylene carbonate (PC)-based electrolytes were carried out to obtain electrolytes for Li secondary batteries. Among the electrolytes examined, 2 M LiClO 4—PC—THF (PC/THF volume ratio = 4 6 ) showed 1.6 times higher conductivity of 9.8 × 10 −3 Ω −1 cm −1 and also ca. 10% higher Li charge-discharge efficiency of 81.3% at 5 mA cm −2 (0.3 C cm −2) than those in 1 M LiClO 4—PC. Generally, Li cycling efficiency increases with increase in electrolyte conductivity. From the analysis made on electrolytic parameters, such as transport number of Li + ion, it was concluded that conductivity and Li cycling efficiency increases were caused by the total effects of lower chemical reactivity of THF to Li and smaller practical Li + ion radius based on Li +—THF complex formation.
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