Rational Design of 1D Partially Graphitized N-Doped Hierarchical Porous Carbon with Uniaxially Packed Carbon Nanotubes for High-Performance Lithium-Ion Batteries

Hang In Cho, Yo Chan Jeong, Jae Ho Kim, Young Shik Cho, Taehoon Kim, Seung Jae Yang, Chong Rae Park

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

N-doped hierarchical porous carbon with uniaxially packed carbon nanotubes (CNTs) was prepared by copolymer single-nozzle electrospinning, carbonization, and KOH activation. Densely and uniaxially aligned CNTs improve the electrical conductivity and act as a structural scaffold, enhancing the electrochemical performance of the anode. A partially graphitized N-doped carbon shell, which has a rapid ion accessible pore network and abundant redox sites, was designed to expand the redox sites from the surface of the material to the whole material, including the inner part. As an anode, this material exhibited a superior reversible capacity of 1814.3 mA h g-1 at 50 mA g-1 and of 850.1 mA h g-1 at 1000 mA g-1. Furthermore, the reversible capacity decreased by only 36% after 400 cycles and showed superior rate capability to that of the same material without CNTs, indicating that the CNT acted successfully as a structural scaffold and enhanced the electrical conductivity. This study not only allowed the rational design of the ideal structure of CNT-based carbonaceous anode material, which has both a rapid ion accessible structure and fast electron-transfer path, but also shed light on a potential strategy by which to use CNTs to modify the nitrogen bonding configuration in N-doped carbon for better electrochemical performance.

Original languageEnglish
Pages (from-to)11106-11119
Number of pages14
JournalACS Nano
Volume12
Issue number11
DOIs
StatePublished - 27 Nov 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

Keywords

  • align
  • anode
  • battery
  • carbon nanofibers
  • carbon nanotubes
  • porous carbon

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