Abstract
The low volumetric energy density limits practical applications of lithium–sulfur batteries (LSBs). To increase the volumetric energy density and utilization of sulfur, a cathode with high tap density and low porosity is desired. Nonetheless, notorious shuttle effects and extremely sluggish redox kinetics severely hinder the enhancement of volumetric energy densities. In this study, a dense La0.3Sr0.7Fe0.2Mn0.8O3/Ti3C2Tx as a multi-functional sulfur host material is developed to immobilize lithium polysulfides (LiPSs), accelerate reaction kinetics, regulate the nucleation and decomposition of Li2S, and suppress the LiPSs shuttle effects. Furthermore, pomegranate-like La0.3Sr0.7Fe0.2Mn0.8O3/Ti3C2Tx/S monolith cathodes were prepared by encapsulating La0.3Sr0.7Fe0.2Mn0.8O3/Ti3C2Tx/S particles with highly conductive reduced graphene oxide. The monolith cathode has a high tap density of 1.85 g cm−3 and achieves a high volumetric energy density of 2927 Wh L−1-cathode and gravimetric capacity of 1398 mAh g−1 at 0.05 C. This study provides a path to constructing LSBs with high volumetric energy densities.
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