Sustainable ZIF-67/Mo-MXene-Derived Nanoarchitecture Synthesis: An Enhanced Durable Performance of Lithium-Selenium Batteries

초록

Selenium-based electrodes have garnered attention for their high electrical conductivity, compatibility with carbonate electrolytes, and volumetric capacity comparable to sulfur electrodes. However, real-time application is hindered by rapid capacity deterioration from the "shuttle effect" of polyselenides and volume fluctuations. To address these challenges, a hybrid Se@ZIF-67/Mo-MXene-derived (Se@Co-NC/Mo2C) nanoarchitecture is developed via an economically viable in situ electrostatic self-assembly of ZIF-67 and Mo2C nanosheets. The catalytic effects and porous framework of Co-NC/Mo2C enhance electrode attributes, promoting superior adsorption and conversion of lithium polyselenides and facile ion/electron transport within the electrode, resulting in stable electrochemical performance. Lithium-selenium batteries (LSeBs) exhibit remarkable characteristics, boasting high specific capacity and exceptional durability. The Se@Co-NC/Mo2C electrode delivers a reversible capacity of 503.5 mAh g-1 at 0.5 C with 98% capacity retention, 100% Coulombic efficiency, and exceptional cyclic durability through 8600 cycles. In sustainability tests at 10C/1C charging/discharging, the Se@Co-NC/Mo2C electrode demonstrates an optimistic and stable capacity of approximate to 370.6 mAh g-1 with 93% capacity retention at the 3100th cycle in a carbonate-based electrolyte and approximate to 181.3 mAh g-1 with 92% capacity retention after 5000 cycles in an ether-based electrolyte, indicating exceptional stability for practical rechargeable batteries. This cost-effective and efficient approach holds significant potential for high-performance and durable LSeBs. To address challenges with selenium-based electrodes in lithium-selenium batteries, this study introduces an innovative approach. It develops a Se-intercalated ZIF-67/Mo-MXene-derived nanoarchitecture through an economical method, which exhibits catalytic adsorption of lithium polyselenides and enhances ion/electron transport, reversible capacity, cyclic durability, and stability under varied charging conditions. This yields impressive electrochemical performance, offering a cost-effective, efficient solution for practical, long-lasting lithium-selenium batteries. image

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