Journal
IONICS
Volume 26, Issue 5, Pages 2335-2342Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-019-03287-9
Keywords
All-solid-state batteries; Interfacial resistance; Electrochemical energy storage; Solid electrolyte
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Li3PS4(LPS) was in situ formed at the active material Li2S through the reaction of Li2S and P2S5 by mechanical ball milling, which can be used to composite cathode for Li/S battery. The fine active materials-electrolyte interface will be generated via in situ reaction. Compared with the direct mixing Li2S + LPS, the interface impedance between Li2S and LPS of Li2S-LPS had a significant decrease from 833.3 omega to 203.7 omega at room temperature. The effect of heat treatment temperature on the ionic conductivities of Li2S-LPS has been studied, and the Li2S-LPS-300 showed the highest ionic conductivity of 2.67 x 10(-4) S cm(-1) at room temperature. The all-solid-state cell (Li/LPS/Li2S-LPS) possessed a larger capacity and better rate performance than that of the cell using Li2S + LPS as cathode material, showing a discharge capacity of 624.5 mAh g(-1) (g of Li2S) for the 20th cycle. We also find that high carbon content of composite cathode will reduce the utilization of Li2S. The composite cathode 90Li(2)S-LPS + 10C (wt%) shows the highest capacity of 763.8 mAh g(-1) at the current density of 0.1 mA cm(-2).
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