Mesoporous Li4Ti5O12/carbon nanofibers for high-rate lithium-ion batteries

Jie Wang, Laifa Shen, Hongsen Li, Bing Ding, Ping Nie, Hui Dou, Xiaogang Zhang

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Mesoporous Li4Ti5O12/carbon nanofibers (LTO/C NFs) are prepared by a facile electrospinning method combined with soft-template self-assembly. The morphology and structure are characterized by field-emission scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The diameter of as-prepared LTO/C NFs is approximately 400 nm with highly crystallinity LTO nanoparticle completely embedded in carbon framework. Nitrogen adsorption-desorption isotherms and corresponding pore size distribution reveal that the mesoporous LTO/C NFs exhibite high specific surface area (212.1 m2/g-1) and large pore volume. Compared with the regular LTO/C NFs, the mesoporous LTO/C NFs show much higher rate capability and better capacity retention. At a current rate of 5 C, the reversible capacity of the mesoporous LTO/C NFs electrode is up to 127.4 mA h g -1 and still remains at 122.7 mA h g-1 after 100 cycles. The excellent electrochemical performances are closedly related to well-defined one-dimensional (1D) mesoporous nanostructure with LTO nanoparticles embedded in the carbon framework, which efficiently shortened the path length of Li + diffusion, enhanced electrolyte-active material contact area and facilitated rapid electron transfer.

Original languageEnglish
Pages (from-to)171-176
Number of pages6
JournalJournal of Alloys and Compounds
Volume587
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • Electrospinning
  • LiTiO
  • Lithium ion batteries
  • Nanofibers
  • Self-assembly

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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