期刊
JOURNAL OF POWER SOURCES
卷 453, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.227905
关键词
All-solid-state battery; Lithium-sulfur battery; Activation of sulfur; High energy density; High power density
All-solid-state lithium-sulfur batteries are believed to have sufficient energy density to be next-generation batteries. In manufacturing the batteries, it is necessary to improve the sulfur reactivity and ion conductivity in the positive electrode. In this study, we investigated (100- x) (Li1.6PS2).x(LiI) as a composite solid electrolyte with a high P/S ratio solid electrolyte and LiI to provide the dual functions of high sulfur activated property and high ionic conductivity. This solid electrolyte showed high ionic conductivity of over 0.5 mS cm(-1) at over x = 35. The positive composite electrode using 65Li(1.6)PS(2).35LiI exhibited a good high rate capacity of over 1260 mA h g(-1) (sulfur) at 6.4 mA cm(-2) (0.8 C) and 25 degrees C. Furthermore, it showed excellent battery performance at 45 degrees C. The high rate capacity was 25.5 mA cm(-2) (3.2 C) over 1000 mA h g(-1), and the 1 C cycle capacity was over 1230 mA h g(-1) after 100 cycles.
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