Zi Liang Huang , Yue Xian Song , Wang Sai Yang , Ya Xin Xie , Shu Rui , Shi Li Juan , Guo Hui Juan , Qin Yuan Hang , Qun Yi
2025 Journal of Energy Storage 107:115007
Abstract
Lithium-sulfur batteries (LSBs) are poised to revolutionize the energy storge for the next generation due to their exceptional specific capacity. Nevertheless, the practical applications of LSBs still face challenges related to shuttle phenomenon and sluggish conversion kinetics of lithium polysulfide (LiPS). An advanced sulfur host with effective adsorption and catalytic conversion capabilities for LiPSs has been regarded as a crucial approach to overcoming these challenges in LSBs. Herein, a three-dimensional hierarchical porous ZIF-8@ZnO and carbon nanocomposite (C-ZIF-8@ZnO) electrode capable of adsorbing and catalyzing LiPS is developed and explored as a sulfur host for LSBs. ZIF-8@ZnO could exhibit high chemical interaction with LiPS, and the distinctive hierarchical structure, featuring a substantial specific surface area, could lead to enhanced LiPS adsorption and uniform sulfur distribution, thus suppressing LiPS shuttling effect and promoting electron transfer and sulfur conversion. Due to these synergistic properties, the S/C-ZIF-8@ZnO cathode has excellent first-turn discharge specific capacity (1360.3 and 1191.2mAh g-1 at 0.1 and 0.2 C, respectively) and excellent cycling stability, maintaining a low capacity decay rate of merely 0.21% per cycle throughout 200 cycles at 0.2 C, and an initial capacity reaching 999.9 mAh g-1 at 1 C. In addition, the coin cell at a substantial sulfur loading of 7.55 mg cm-2 and a minimal E/S ratio of 3.52 μL mg-1 yields a substantial initial area capacity of 7.0 mAh cm-2. This study showcases a novel approach to the optimized design of high-performance sulfur host for LSBs.
锂硫電池（LSBs）因其卓越的比容量，有望徹底改變下一代能量存儲技術。然而，LSBs的實際應用仍面臨多硫化锂（LiPS）穿梭效應和轉化動力學遲緩等問題的挑戰。開發一種具備高效吸附和催化轉化LiPS能力的先進硫宿主材料被認為是克服這些挑戰的關鍵途徑。在此研究中，開發并探索了一種三維分層多孔ZIF-8@ZnO與碳納米複合材料（C-ZIF-8@ZnO）電極作為锂硫電池的硫宿主材料，該材料能夠有效吸附和催化LiPS。ZIF-8@ZnO表現出與LiPS的高化學相互作用，其獨特的分層結構具有較大的比表面積，可增強LiPS的吸附和硫的均勻分布，從而抑制LiPS的穿梭效應，并促進電子轉移和硫的轉化。得益于這些協同特性，S/C-ZIF-8@ZnO正極在首次放電時表現出優異的比容量（在0.1 C和0.2 C下分别為1360.3和1191.2 mAh g^-1），并具有出色的循環穩定性，在0.2 C下經過200次循環後，每圈的容量衰減率僅為0.21%，且在1 C下的初始容量達到999.9 mAh g^-1。此外，在7.55 mg cm^-2的高硫負載和3.52 μL mg^-1的低電解液/硫比（E/S）條件下，紐扣電池實現了高達7.0 mAh cm^-2的初始面容量。本研究展示了一種優化設計高性能锂硫電池硫宿主材料的新方法。
