Synthesis of 3Li2S–1P2S5–xLiI solid electrolytes by liquid-phase shaking method for all-solid-state Li metal batteries
Source abstract
Abstract
3Li2S–1P2S5–xLiI (x = 0, 0.5, 0.9, 1) solid electrolytes were synthesized by liquid-phase shaking methods using ethyl propionate as a reaction medium. The X-ray diffraction results showed that the main phase at both x = 0.9 and 1.0 was Li4PS4I. The highest ionic conductivity at 25 °C was 7.8 × 10−4 S cm−1 for 3Li2S–1P2S5–0.9LiI (Li6.9P2S8I0.9), although it was 6.4 × 10−4 S cm−1 for 3Li2S–1P2S5–1LiI (Li7P2S8I). Despite the lower ionic conductivity of 3Li2S–1P2S5–1LiI (Li7P2S8I), it exhibited a better stability toward Li metal than 3Li2S–1P2S5–0.9LiI (Li6.9P2S8I0.9), indicating that the amount of LiI strongly affects the stability of the electrolyte against Li metal. In addition, 3Li2S–1P2S5–1LiI (Li7P2S8I) was employed in both the cathode composite and separator in the all-solid-state battery in which LiNbO3 coated-LiNi1/3Mn1/3Co1/3O2 and Li were used as cathode and anode, respectively. The all-solid-state battery showed the reversible capacity of approximately 140 mAh g−1, indicating that 3Li2S–1P2S5–1LiI (Li7P2S8I) solid electrolyte is suitable for an all-solid-state Li metal battery.
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OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Chemical Synthesis and Characterization
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