Interconnected carbon nanotube/graphene nanosphere scaffolds as free-standing paper electrode for high-rate and ultra-stable lithium-sulfur batteries
Interconnected carbon nanotube/graphene nanosphere scaffolds as free-standing paper electrode for high-rate and ultra-stable lithium-sulfur batteries
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互连碳纳米管/石墨烯纳米球支架作为高倍率和超稳定锂硫电池的独立式纸电极
DOI：
10.1016/j.nanoen.2014.11.062
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发表时间：
2015
期刊：
影响因子：
17.6
通讯作者：
Zhang, Qiang
中科院分区：
文献类型：
--
作者：
Guo, Xuefeng;Zhu, Wancheng;Li, Peng;Zhang, Qiang
具有高容量、高倍率性能和高循环稳定性的柔性电极的合理设计和制造是可弯曲、可穿戴和可植入电子器件的迫切需要。将导电纳米碳集成为柔性支架是实现柔性高能量密度锂硫电池的一种高效且有效的途径。本文通过室温溶液加工法将高导电性的超长碳纳米管（CNTs）和纳米尺寸的中空石墨烯球（GS）合理整合，构建了一种用于锂硫电池的自支撑纸电极。中空GS提供了封闭的空间来容纳硫物种，维持循环期间的体积波动，并延缓多硫化物和寄生穿梭的溶解。GS和超长CNT的石墨烯壁协同构建分级的短程/长程电子/离子路径。因此，所得柔性纸电极具有81%的高硫利用率（对应于1346 mA h g−1），电流密度为0.17 A g−1（0.19 mA cm-2），当电流密度增加到最高16.7 A g-1时，高倍率容量保持率为40%（18.4 mA cm-2），并且在500次循环中具有89.0%的优异的上级容量保持率。这一概念验证研究表明，石墨烯和CNT的良好杂化有望在未来柔性电子产品中有效用作柔性电极。
The rational design and fabrication of flexible electrodes with high capacity, high rate capability, and high cycling stability is of urgent need for bendable, wearable, and implantable electronic devices. The integration of conductive nanocarbon as flexible scaffolds is an efficient and effective route toward flexible high-energy-density lithium–sulfur batteries. Herein, a free-standing paper electrode was constructed by rational integration of high conductive super-long carbon nanotubes (CNTs) and nano-sized hollow graphene spheres (GSs) through a room-temperature solution-processable method for lithium–sulfur batteries. The hollow GSs afforded close space to accommodate sulfur species, sustain the volume fluctuation during cycling, and retard the dissolution of polysulfides and parasitic shuttle. The graphene walls of GSs and super-long CNTs synergistically constructed hierarchical short-/long-range electron/ion pathways. Consequently, the as-obtained flexible paper electrode was with a high sulfur utilization of 81% (corresponding to 1346 mA h g−1) at a current density of 0.17 A g−1(0.19 mA cm−2), a high-rate capacity retention of 40% when the current density increased to supreme 16.7 A g−1(18.4 mA cm−2), and a superior capacity retention of 89.0% over 500 cycles. This proof-of-concept research indicated the well hybridization of graphene and CNTs holds promise in the efficient use as flexible electrodes for future flexible electronics.
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