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首页> 外文期刊>Advanced energy materials >Frogspawn-Coral-Like Hollow Sodium Sulfide Nanostructured Cathode for High-Rate Performance Sodium–Sulfur Batteries
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Frogspawn-Coral-Like Hollow Sodium Sulfide Nanostructured Cathode for High-Rate Performance Sodium–Sulfur Batteries

机译：用于高速率性能钠 - 硫磺电池的Frogspawn-珊瑚样中空硫化钠纳米结构阴极

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摘要

Room-temperature (RT) sodium-sulfur (Na-S) batteries are attractive cost-effective platforms as the next-generation energy storage systems by using all earth-abundant resources as electrode materials. However, the slow kinetics of Na-S chemistry makes it hard to achieve high-rate performance. Herein, a facile and scalable approach has been developed to synthesize hollow sodium sulfide (Na2S) nanospheres embedded in a highly hierarchical and spongy conductive carbon matrix, forming an intriguing architecture similar to the morphology of frogspawn coral, which has shown great potential as a cathode for high-rate performance RT Na-S batteries. The shortened Na-ion diffusion pathway benefits from the hollow structures together with the fast electron transfer from the carbon matrix contributes to high electrochemical reactivity, leading to superior electrochemical performance at various current rates. At high current densities of 1.4 and 2.1 A g(-1), high initial discharge capacities of 980 and 790 mAh g(sulfur)(-1) can be achieved, respectively, with reversible capacities stabilized at 600 and 400 mAh g(sulfur)(-1) after 100 cycles. As a proof of concept, a Na-metal-free Na-S battery is demonstrated by pairing the hollow Na2S cathode with tin-based anode. This work provides guidance on rational materials design towards the success of RT high-rate Na-S batteries.
机译：室温（RT）钠 - 硫磺（NA-S）电池是通过使用所有地球丰富的资源作为电极材料的下一代能量存储系统具有吸引力的成本效益平台。然而，Na-S化学的缓慢动力学使其难以实现高速率的性能。在此，已经开发了一种容易和可伸缩的方法以合成嵌入高度分层和海绵状导电碳基质中的中空硫化钠（Na 2 S）纳米球，形成类似于Frogspawn珊瑚形态的有趣架构，这表明了作为阴极的巨大潜力用于高速性能RT NA-S电池。缩短的Na离子扩散途径与中空结构的益处与来自碳基质的快速电子转移有助于高电化学反应性，导致各种电流速率优异的电化学性能。在1.4和2.1的高电流密度下，可以分别实现980和790mAhg（硫）（ - 1）的高初始放电容量，可逆容量稳定在600和400mahg（硫）（ - 1）100次循环后。作为概念证据，通过将空心Na2S阴极与基于锡基阳极配合的空心Na2S阴极来证明Na-金属Na-S电池。这项工作为RT高速率Na-S电池的成功提供了有关Rational材料设计的指导。

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