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Journal of Materials Science and Nanotechnology | Volume 2
October 29-30, 2018 | London, UK
Nanomaterials and Nanotechnology
International Conference on
Carbon nanoweb-based metal anode for sodium rechargeable batteries
Young Soo Yun
Kangwon National University, Korea
B
ecause of its remarkably high theoretical capacity and
favourable redox voltage (−2.71V vs. the standard hydrogen
electrode), Na is apromising anodematerial forNa ionbatteries.
In this study, microporous catalytic carbon nano templates (MC-
CNTs) based on nanoweb-structured carbon nanofibers with
various carbon microstructures are prepared from microbe-
derived cellulose via simple heating at 800 or 2400°C. MC-
CNTs prepared at 800°C have amorphous carbon structures
with numerous topological defects and exhibit a lower voltage
overpotential of ~8mV ingalvanostatic charge/discharge testing.
In addition, MC-CNT-800s exhibit high Coulombic efficiencies
of 99.4-99.9% during consecutive cycling at current densities
ranging from0.2 to4mAcm
−2
.However, thecarbonstructuresof
MC-CNTs prepared at 800 °C are gradually damaged by cycling.
This results in significant capacity losses after about 200 cycles.
Incontrast,MC-CNTspreparedat2400°Cexhibitwell-developed
graphitic structures and maintain predominantly stable cycling
behaviours over 1000 cycles with coulombic efficiencies of
~99.9%. This study demonstrates the superiority of catalytic
carbon nano templates with well-defined pore structures
and graphitic microstructures for use in Na metal anodes.
Speaker Biography
Young Soo Yun has completed his Ph.D. degree from Inha University, South Korea.
He is the professor of Kangwon National University, South Korea. He has over 100
publications that have been cited over 2,000 times, and his publication h-index is
21. His specific research field is carbon-based electrochemistry for energy storage.
e:
promars0soo@gmail.com