Zhang Peilin, Huang Kang, Zhu Siyu, Xiu Mingzhen, Cao Xun, Huang Chen, Huang Yizhong, Chen Luyang
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China.
School of Optical and Electronic Information, Suzhou City University, Suzhou, 215104, China.
Small. 2025 Jan;21(2):e2405560. doi: 10.1002/smll.202405560. Epub 2024 Nov 19.
As active materials for large-radius Na storage, metal sulfide (MS) anodes still face several challenges, including poor intrinsic electric conductivity, severe volume change along with the shuttle and dissolution effects of discharge-produced polysulfides. In this work, the mixed nickel-manganese sulfides (NiMnS) in the morphology of uniform 2D ultrathin nanosheets are derived from layered metal-organic frameworks (MOFs), where the NiS-MnS heterojunction are accommodated in carbon matrix with S dopant (NiMnS/SC). Through experiments and density functional theory (DFT) simulations, it is revealed that the carbon matrix with S dopant has multifunctional effects on active NiMnS during the charge/discharge process, including conductive intermediary, electrochemical active site, physical barrier, and chemical adsorption. This work may promote the design of MS-based electrodes in SIBs and extend the application of carbon material with S dopant in Na-S batteries.
作为用于大半径钠存储的活性材料，金属硫化物（MS）阳极仍然面临若干挑战，包括本征电导率差、严重的体积变化以及放电产生的多硫化物的穿梭和溶解效应。在这项工作中，均匀二维超薄纳米片形态的混合镍锰硫化物（NiMnS）源自层状金属有机框架（MOF），其中NiS-MnS异质结容纳在含硫掺杂剂的碳基质中（NiMnS/SC）。通过实验和密度泛函理论（DFT）模拟表明，含硫掺杂剂的碳基质在充放电过程中对活性NiMnS具有多种功能作用，包括导电中间体、电化学活性位点、物理屏障和化学吸附。这项工作可能会促进钠离子电池中基于MS的电极设计，并扩展含硫掺杂剂的碳材料在钠硫电池中的应用。
