Pyrolytic carbon nanosheets for ultrafast and ultrastable sodium-ion storage
- Pyrolytic carbon nanosheets for ultrafast and ultrastable sodium-ion storage
- 이성호; 최재원; 조세연; 강민지; 이민의; 김해진; Cecilia Leal; 진형준; 윤영수; Hyeon Ji Yoon
- anodes; carbon nanosheets; cointercalation; pyrolytic carbon; sodium ion batteries
- Issue Date
- VOL 14, NO 17-1703043-9
- 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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