Premium
Pyrolytic Carbon Nanosheets for Ultrafast and Ultrastable Sodium‐Ion Storage
Author(s) -
Cho Se Youn,
Kang Minjee,
Choi Jaewon,
Lee Min Eui,
Yoon Hyeon Ji,
Kim Hae Jin,
Leal Cecilia,
Lee Sungho,
Jin HyoungJoon,
Yun Young Soo
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201703043
Subject(s) - materials science , pyrolytic carbon , anode , carbon fibers , chemical engineering , electrolyte , electrochemistry , highly oriented pyrolytic graphite , graphite , nanotechnology , pyrolysis , composite material , composite number , electrode , chemistry , engineering
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 sp 2 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.