Pyrolytic Carbon Nanosheets for Ultrafast and Ultrastable Sodium‐Ion Storage |
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| Authors: | Se Youn Cho Minjee Kang Jaewon Choi Min Eui Lee Hyeon Ji Yoon Hae Jin Kim Cecilia Leal Sungho Lee Hyoung‐Joon Jin Young Soo Yun |
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| Affiliation: | 1. Department of Polymer Science and Engineering, Inha University, Incheon, South Korea;2. Department of Materials Science and Engineering, University of Illinois at Urbana ? Champaign, Urbana, IL, USA;3. Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Wanju‐gun, Jeonbuk, South Korea;4. Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon, South Korea;5. Carbon Composite Materials Research Center, Korea Institute of Science and Technology, Wanju‐gun, Jeonbuk, South Korea;6. Department of Chemical Engineering, Kangwon National University, Samcheok, South Korea |
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| 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. |
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| Keywords: | anodes carbon nanosheets cointercalation pyrolytic carbon sodium ion batteries |
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