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Hollow Carbon and MXene Dual-Reinforced MoS2 with Enlarged Interlayers for High-Rate and High-Capacity Sodium Storage Systems
Advanced Science ( IF 14.3 ) Pub Date : 2024-01-22 , DOI: 10.1002/advs.202400364 Hanqing Pan 1 , Yan Huang 1 , Xinnuo Cen 1 , Ming Zhang 1 , Jianhua Hou 2 , Chao Wu 3 , Yuhai Dou 3 , Bing Sun 4 , Ying Wang 1 , Binwei Zhang 5, 6 , Lei Zhang 7
Advanced Science ( IF 14.3 ) Pub Date : 2024-01-22 , DOI: 10.1002/advs.202400364 Hanqing Pan 1 , Yan Huang 1 , Xinnuo Cen 1 , Ming Zhang 1 , Jianhua Hou 2 , Chao Wu 3 , Yuhai Dou 3 , Bing Sun 4 , Ying Wang 1 , Binwei Zhang 5, 6 , Lei Zhang 7
Affiliation
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Sodium-ion batteries (SIBs) and sodium-ion capacitors (SICs) are promising candidates for cost-effective and large-scale energy storage devices. However, sluggish kinetics and low capacity of traditional anode materials inhibit their practical applications. Herein, a novel design featuring a layer-expanded MoS2 is presented that dual-reinforced by hollow N, P-codoped carbon as the inner supporter and surface groups abundant MXene as the outer supporter, resulting in a cross-linked robust composite (NPC@MoS2/MXene). The hollow N, P-codoped carbon effectively prevents agglomeration of MoS2 layers and facilitates shorter distances between the electrolyte and electrode. The conductive MXene outer surface envelops the NPC@MoS2 units inside, creating interconnected channels that enable efficient charge transfer and diffusion, ensuring rapid kinetics and enhanced electrode utilization. It exhibits a high reversible capacity of 453 mAh g−1, remarkable cycling stability, and exceptional rate capability with 54% capacity retention when the current density increases from 100 to 5000 mA g−1 toward SIBs. The kinetic mechanism studies reveal that the NPC@MoS2/MXene demonstrates a pseudocapacitance dominated hybrid sodiation/desodiation process. Coupled with active carbon (AC), the NPC@MoS2/MXene//AC SICs achieve both high energy density of 136 Wh kg−1 at 254 W kg−1 and high-power density of 5940 W kg−1 at 27 Wh g−1, maintaining excellent stability.
中文翻译：
用于高速率和高容量钠存储系统的具有加大夹层的中空碳和 MXene 双增强 MoS2
钠离子电池（SIB）和钠离子电容器（SIC）是具有成本效益的大规模储能设备的有希望的候选者。然而，传统负极材料的缓慢动力学和低容量限制了其实际应用。在此，提出了一种以层扩展MoS 2为特色的新颖设计，该设计通过空心N、P共掺杂碳作为内部支撑物和表面基团丰富的MXene作为外部支撑物进行双重增强，从而产生交联的坚固复合材料（NPC @ MoS2 /MXene）。中空的N、P共掺杂碳有效地防止MoS 2层的团聚并有利于缩短电解质和电极之间的距离。导电 MXene 外表面将 NPC@MoS 2单元包裹在内部，形成互连通道，实现高效的电荷转移和扩散，确保快速动力学并提高电极利用率。当电流密度从100 mA g -1 增加到5000 mA g -1时，它表现出453 mAh g -1的高可逆容量、卓越的循环稳定性和优异的倍率性能，容量保持率为54%。动力学机制研究表明NPC@MoS 2 /MXene表现出赝电容主导的混合钠化/脱钠过程。与活性炭（AC）结合，NPC@MoS 2 /MXene//AC SIC在254 W kg -1时实现了136 Wh kg -1的高能量密度，在27 Wh 时实现了5940 W kg -1的高功率密度g -1 ，保持优异的稳定性。
更新日期：2024-01-22
中文翻译：
用于高速率和高容量钠存储系统的具有加大夹层的中空碳和 MXene 双增强 MoS2
钠离子电池（SIB）和钠离子电容器（SIC）是具有成本效益的大规模储能设备的有希望的候选者。然而，传统负极材料的缓慢动力学和低容量限制了其实际应用。在此，提出了一种以层扩展MoS 2为特色的新颖设计，该设计通过空心N、P共掺杂碳作为内部支撑物和表面基团丰富的MXene作为外部支撑物进行双重增强，从而产生交联的坚固复合材料（NPC @ MoS2 /MXene）。中空的N、P共掺杂碳有效地防止MoS 2层的团聚并有利于缩短电解质和电极之间的距离。导电 MXene 外表面将 NPC@MoS 2单元包裹在内部，形成互连通道，实现高效的电荷转移和扩散，确保快速动力学并提高电极利用率。当电流密度从100 mA g -1 增加到5000 mA g -1时，它表现出453 mAh g -1的高可逆容量、卓越的循环稳定性和优异的倍率性能，容量保持率为54%。动力学机制研究表明NPC@MoS 2 /MXene表现出赝电容主导的混合钠化/脱钠过程。与活性炭（AC）结合，NPC@MoS 2 /MXene//AC SIC在254 W kg -1时实现了136 Wh kg -1的高能量密度，在27 Wh 时实现了5940 W kg -1的高功率密度g -1 ，保持优异的稳定性。
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