阳极
材料科学
法拉第效率
成核
纳米技术
模板
电极
碳纤维
化学工程
复合材料
化学
复合数
工程类
物理化学
有机化学
作者
Min Eui Lee,Seunggon Lee,Jaewon Choi,Hyoung‐Joon Jin,Seungyong Han,Young Soo Yun
出处
期刊:Small
[Wiley]
日期:2019-07-18
卷期号:15 (37)
被引量:44
标识
DOI:10.1002/smll.201901274
摘要
Anode-free sodium metal batteries (AF-SMBs) can deliver high energy and enormous power, but their cycle lives are still insufficient for them to be practical as a power source in modern electronic devices and/or grid systems. In this study, a nanohybrid template based on high aspect-ratio silver nanofibers and nitrogen-rich carbon thin layers as a core-shell structure is designed to improve the Coulombic efficiency (CE) and cycling performance of AF-SMBs. The catalytic nanohybrid templates dramatically reduce the voltage overshooting caused by metal nucleation to one-fifth that of a bare Al foil electrode (≈6 mV vs ≈30 mV), and high average CE values of >99% are achieved over a wide range of current rates from 0.2 to 8 mA cm-2 . Moreover, exceptionally long cycle lives for more than 1600 cycles and an additional 1500 cycles are achieved with a highly stable CE of >99.9%. These results show that AF-SMBs are feasible with the nanohybrid electrode system.
科研通智能强力驱动
Strongly Powered by AbleSci AI