Journal
SMALL
Volume 15, Issue 37, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201901274
Keywords
anode-free; core-shell; metal batteries; nanohybrid; nitrogen-doped carbon
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2017R1C1B1004167, 2018R1A4A1025169]
- National Research Foundation of Korea [2018R1A4A1025169, 2017R1C1B1004167] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 (approximate to 6 mV vs approximate to 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.
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