Abstract
MoO2 is heterogeneously grafted onto reduced graphene oxide (rGO) to create a MoO2@rGO heterostructure, which acts as a host material for sulfur in lithium-sulfur batteries (LSBs). The transition metal compounds MoO2 enhance the adsorption capacity for lithium polysulfides (LiPSs) and promote catalytic conversion processes. The MoO2@rGO cathode exhibits high sulfur loading (70 wt.%), elevated specific capacity (1136 mAh g-1 at 0.3 C, 9 mg cm-2), and excellent rate performance. Importantly, MoO2@rGO/S (12 mg cm-2) demonstrates a localized capacity of 11.60 mAh in the first discharge. After 110 cycles under a current density of 2.01 mA cm-2, it still retains residual capacity of 6.12 mAh, with a specific discharge capacity of 536 mAh g-1, showcasing superior cycling competence. The MoO2@rGO/S-100 mg pouch cell achieves an initial specific capacity of 1128 mAh g-1. After 110 cycles at 0.2 C, it retains a specific capacity of 738 mAh g-1 (65.4%), with a coulombic efficiency stabilizing around 99.2%. Two series-connected MoO2@rGO/S pouch cells-powered drone run continuously for 115 s. Hence, heterostructured MoO2@rGO can serve as a LiPS catcher, accelerate the redox kinetics of sulfur, and hold promise for constructing next-generation LSBs with outstanding electrochemical performance.
Published Version
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