Pyrolytic carbon nanosheets for ultrafast and ultrastable sodium-ion storage

Title
Pyrolytic carbon nanosheets for ultrafast and ultrastable sodium-ion storage
Authors
이성호최재원조세연강민지이민의김해진Cecilia Leal진형준윤영수Hyeon Ji Yoon
Keywords
anodes; carbon nanosheets; cointercalation; pyrolytic carbon; sodium ion batteries
Issue Date
2018-04
Publisher
Small
Citation
VOL 14, NO 17-1703043-9
Abstract
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 °C has a distinctive sp2 carbon bonding nature, crystalline domain size of ≈ 44.2 Å , and high electrical conductivity of ≈ 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.
URI
http://pubs.kist.re.kr/handle/201004/67853
ISSN
1613-6810
Appears in Collections:
KIST Publication > Article
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