| 卢嘉藜,齐子欣,骆赛男.2D-MOF衍生的CoSe/多孔片层碳载体的制备及其在锂硫电池中的性能研究[J].有色金属材料与工程,2025,46(6):1-8. |
| 2D-MOF衍生的CoSe/多孔片层碳载体的制备及其在锂硫电池中的性能研究 |
| Preparation of 2D-MOF derived CoSe/porous carbon sheets and study on performance of lithium-sulfur batteries |
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| DOI：10.13258/j.cnki.nmme.20240311001 |
| 中文关键词: 锂硫电池 多硫化物 正极材料 硒化钴 电化学性能 |
| 英文关键词:lithium-sulfur battery polysulfide anode material CoSe electrochemical performance |
| 基金项目:上海市“超级博士后”激励计划(2022475); 上海市启明星人才项目（扬帆专项）(23YF1428900) |
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| 中文摘要: |
| 随着电动汽车与大规模储能电网的快速发展，锂离子电池将不可避免地面临有限的能量密度无法满足日益增长的需求和成本不断上升的困境。锂硫电池（lithium-sulfur batteries， LSB）由于其显著能量密度和低成本被认为是一种有前途和有竞争力的新型储能选择。然而，LSB的商业化发展目前仍面临一些阻碍，特别是多硫化锂（lithium polysulfides，LiPSs）的穿梭效应和缓慢的氧化还原动力学。提出一种由2D沸石咪唑骨架（ZIF）衍生的过渡金属硒化物（TMSe）/复合多孔碳材料作为锂硫电池的多功能硫载体：CoSe/N掺杂碳（CoSe/NHC）。其中，2D结构有利于活性物质硫的均匀负载和锂离子的快速传输，而均匀负载的CoSe纳米颗粒有助于吸附和催化多硫化物，从而实现锂硫电池电化学性能的提高。因此，CoSe/NHC载硫（CoSe/NHC@S）复合正极展现出良好的电化学性能。在0.2 A/g的电流密度下，CoSe/NHC@S电极循环100次后，比容量仍可达478.5 mA·h/g，库仑效率接近100%；即使在电流密度为1A/g时，经500次循环，该电极材料仍保持有274.3 mA·h/g的容量，单圈容量衰减率仅为0.047%。该工作有望为高性能锂硫电池正极材料的优化设计提供理论依据与技术指导。 |
| 英文摘要: |
| With the rapid development of electric vehicles and large-scale energy storage grids, lithium-ion batteries will inevitably face the difficulties of limited energy density, which may fail to meet the increasing demand and lead to rising costs. Lithium-sulfur batteries (LSB) are considered a promising and competitive new energy storage option due to their significant energy density and low cost. However, the commercialization of LSB still faces some obstacles, especially the shuttle effect of lithium polysulfides (LiPSs) and slow redox kinetics. Among them, the 2D structure facilitates the uniform loading of sulfur and rapid transport of lithium ions. Additionally, the uniform loading of CoSe nanoparticles promotes the adsorption and catalysis of polysulfides, thereby improving the electrochemical performance of LSB. Therefore, the composite cathode of CoSe/NHC with sulfur (CoSe/NHC@S) exhibits favorable electrochemical properties. Consequently, the CoSe/NHC@S electrodes demonstrate good electrochemical performance, with a specific capacity of 478.5 mA·h/g over 100 cycles at 0.2 A/g (coulombic efficiency close to 100%). Even at a current density of 1 A/g, the CoSe/NHC@S electrode still maintains a capacity of 274.3 mA·h/g after 500 cycles, with a capacity fading of less than 0.047% per cycle. This work is expected to provide theoretical basis and technical guidance for the optimal design of cathode materials for high-performance lithium-sulfur batteries. |
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