Hu Xuanhe, Lin Shangjun, Chen Ruwei, Zhang Gengyuan, Huang Tian, Li Jianrong, Yang Xianghua, Chung Lai-Hon, Yu Lin, He Jun
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
ACS Appl Mater Interfaces. 2022 Jul 20;14(28):31942-31950. doi: 10.1021/acsami.2c06131. Epub 2022 Jul 6.
Lithium-sulfur (Li-S) batteries hold great promise for new-generation energy storage technologies owing to their overwhelming energy density. However, the poor conductivity of active sulfur and the shuttle effect limit their widespread use. Herein, a carbon cloth decorated with thiol-containing UiO-66 nanoparticles (CC@UiO-66(SH)) was developed to substitute the traditional interlayer and current collector for Li-S batteries. One side of CC@UiO-66(SH) acts as a current collector to load active materials, while the other side serves as an interlayer to further restrain polysulfide shuttling. This two-in-one integrated architecture endows the sulfur cathode with fast electron/ion transport and efficient chemical confinement of polysulfides. More importantly, rich thiol groups in the pores of UiO-66(SH) serve to tether polysulfides by both covalent interactions and lithium bonding. Therefore, the Li-S battery equipped with this integrated interlayer-current collector not only delivers an enhanced specific capability (1209 mAh g at 0.1 C) but also exhibits prominent cycling stability (an attenuation rate of 0.037% per cycle for 1000 cycles at 1 C). Meanwhile, the battery achieves a high discharge capacity of 795 mAh g at a sulfur loading of 3.83 mg cm. The new metal-organic framework (MOF)-based electrode material reported in this study undoubtedly provides insights into the exploration of functional MOFs for robust Li-S batteries.
锂硫（Li-S）电池因其极高的能量密度在新一代储能技术方面极具潜力。然而，活性硫的低导电性和穿梭效应限制了它们的广泛应用。在此，开发了一种用含硫醇的UiO-66纳米颗粒修饰的碳布（CC@UiO-66(SH)），以替代锂硫电池的传统中间层和集流体。CC@UiO-66(SH)的一侧作为集流体来负载活性材料，而另一侧作为中间层来进一步抑制多硫化物的穿梭。这种二合一的集成结构赋予硫阴极快速的电子/离子传输以及对多硫化物的高效化学限制。更重要的是，UiO-66(SH)孔隙中的丰富硫醇基团通过共价相互作用和锂键来束缚多硫化物。因此，配备这种集成中间层-集流体的锂硫电池不仅具有更高的比容量（在0.1 C时为1209 mAh g），而且还表现出出色的循环稳定性（在1 C下1000次循环，每次循环的衰减率为0.037%）。同时，在硫负载量为3.83 mg cm时，该电池实现了795 mAh g的高放电容量。本研究报道的新型金属有机框架（MOF）基电极材料无疑为探索用于高性能锂硫电池的功能性MOF提供了思路。
