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Sulfur-Embedded FeS2 as a High-Performance Cathode for Room Temperature All-Solid-State Lithium–Sulfur Batteries
journal contribution
posted on 2020-04-07, 21:29 authored by Jean Pierre Mwizerwa, Qiang Zhang, Fudong Han, Hongli Wan, Liangting Cai, Chunsheng Wang, Xiayin YaoAll-solid-state lithium–sulfur batteries employing sulfur
electrodes and a solid electrolyte at room temperature are still a
great challenge owing to the low conductivities of sulfur cathodes.
In this work, we report room temperature all-solid-state lithium–sulfur
batteries using thin sulfur layer-embedded FeS2 (FeS2@S) microsphere composites as active materials in the FeS2@S–Li10GeP2S12-Super
P cathode electrode. Setting the cut-off voltage between 1.5 and 2.8
V, only lithiation–delithiation reactions between L2FeS2 and FeSy and direct reaction
between Li2S and S will occur, which avoids large volume
change of FeS2 caused by the conversion reaction, leading
to the structure integrity of FeS2@S. The resultant batteries
exhibit excellent rate and cyclic performances, delivering specific
capacities of 1120.9, 937.2, 639.7, 517.2, 361.5, and 307.0 mA h g–1 for the FeS2@S composite cathode, corresponding
to the normalized capacities of 1645.5, 1252.9, 782.5, 700.2, 478.4,
and 363.6 mA h g–1 for sulfur at 30, 50, 100, 500,
1000, and 5000 mA g–1, respectively. Besides, they
can retain the normalized capacity of 430.7 mA h g–1 for sulfur at 1000 mA g–1 after 200 cycles at
room temperature.