Ding Chenfeng, Huang Lingbo, Lan Jinle, Yu Yunhua, Zhong Wei-Hong, Yang Xiaoping
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA.
Small. 2020 Mar;16(11):e1906883. doi: 10.1002/smll.201906883. Epub 2020 Feb 20.
Developing supermechanically resilient hard carbon materials that can quickly accommodate sodium ions is highly demanded in fabricating durable anodes for wearable sodium-ion batteries. Here, an interconnected spiral nanofibrous hard carbon fabric with both remarkable resiliency (e.g., recovery rate as high as 1200 mm s ) and high Young's modulus is reported. The hard carbon nanofabrics are prepared by spinning and then carbonizing the reaction product of polyacrylonitrile and polar molecules (melamine). The resulting unique hard carbon possesses a highly disordered carbonaceous structure with enlarged interlayer spacing contributed from the strong electrostatic repulsion of dense pyrrolic nitrogen atoms. Its excellent resiliency remains after intercalation/deintercalation of sodium ions. The outstanding sodium-storage performance of the derived anode includes excellent gravimetric capacity, high-power capability, and long-term cyclic stability. More significantly, with a high loading mass, the hard carbon anode displays a high-power capacity (1.05 mAh cm at 2 A g ) and excellent cyclic stability. This study provides a unique strategy for the design and fabrication of new hard carbon materials for advanced wearable energy storage systems.
在制造用于可穿戴钠离子电池的耐用阳极时，迫切需要开发能够快速容纳钠离子的具有超强机械弹性的硬碳材料。在此，报道了一种具有显著弹性（例如，恢复率高达1200毫米/秒）和高杨氏模量的相互连接的螺旋纳米纤维硬碳织物。硬碳纳米织物是通过将聚丙烯腈和极性分子（三聚氰胺）的反应产物纺丝然后碳化制备而成。所得独特的硬碳具有高度无序的碳质结构，其层间距增大是由密集的吡咯氮原子的强静电排斥作用所致。在钠离子嵌入/脱嵌后，其优异的弹性得以保留。所得阳极出色的储钠性能包括优异的重量容量、高功率性能和长期循环稳定性。更重要的是，在高负载质量下，硬碳阳极展现出高功率容量（在2 A/g时为1.05 mAh/cm²）和出色的循环稳定性。本研究为先进可穿戴储能系统新型硬碳材料的设计与制造提供了独特策略。
