期刊
SMALL
卷 14, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703043
关键词
anodes; carbon nanosheets; cointercalation; pyrolytic carbon; sodium ion batteries
类别
资金
- National Research Foundation of Korea grants - Korean government (MEST) [NRF-2016R1A2B4009601, NRF-2017R1C1B1004167]
- Korea Institute of Science and Technology (KIST) Programs [2Z05360, 2Z05400]
- US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
Na-ion cointercalation in the graphite host structure in a glyme-based electrolyte represents a new possibility for using carbon-based materials (CMs) as anodes for Na-ion storage. However, local microstructures and nanoscale morphological features in CMs affect their electrochemical performances; they require intensive studies to achieve high levels of Na-ion storage performances. Here, pyrolytic carbon nanosheets (PCNs) composed of multitudinous graphitic nanocrystals are prepared from renewable bioresources by heating. In particular, PCN-2800 prepared by heating at 2800 degrees C has a distinctive sp(2) carbon bonding nature, crystalline domain size of approximate to 44.2 angstrom, and high electrical conductivity of approximate to 320 S cm(-1), presenting significantly high rate capability at 600 C (60 A g(-1)) and stable cycling behaviors over 40 000 cycles as an anode for Na-ion storage. The results of this study show the unusual graphitization behaviors of a char-type carbon precursor and exceptionally high rate and cycling performances of the resulting graphitic material, PCN-2800, even surpassing those of supercapacitors.
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