Lithium-sulfur batteries (LSBs) show promise for achieving a high energy density of 500 W h kg, despite challenges such as poor cycle life and low energy efficiency due to sluggish redox kinetics of lithium polysulfides (LiPSs) and sulfur's electronic insulating nature. We present a novel 2D TiC Mxene on a 2D graphitic carbon nitride (g-CN) heterostructure designed to enhance LiPS conversion kinetics and adsorption capacity. In a pouch cell configuration with lean electrolyte conditions (∼5 μL mg), the g-CN-Mx/S cathode exhibited excellent rate performance, delivering ∼1061 mA h g at C/8 and retaining ∼773 mA h g after 190 cycles with a Coulombic efficiency (CE) of 92.7%. The battery maintained a discharge capacity of 680 mA h g even at 1.25 C. It operated reliably at an elevated sulfur loading of 5.9 mg cm, with an initial discharge capacity of ∼900 mA h g and a sustained CE of over 83% throughout 190 cycles. Postmortem XPS and EIS analyses elucidated charge-discharge cycle-induced changes, highlighting the potential of this heterostructured cathode for commercial garnet LSB development.
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