Comparison of structural analysis and electrochemical studies of C-Li 4Ti5O12 and CNT-Li4Ti 5O12 nanocomposites particles used as anode for lithium ion battery

Xiangcheng Sun, Xuedong Bai, Yongqing Wang, M. Hegde, I. D. Hosein, P. V. Radovanovic, Yu Guo Guo, Bo Cui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Carbon-Li4Ti5O12 (C-LTO) and carbon nanotube-Li4Ti5O12 (CNT-LTO) nanocomposite particles have been synthesized by hydrothermal method and a following high-temperature calcinations using a mixture of micro-size Li-Ti-O precursors and conducting black and carbon nanotubes, respectively. Two different types of coating layers have been characterized and analyzed on two kinds of Li 4Ti5O12 particles surface by high resolution transmission electron microscopy images (HR-TEM) and selected area electron diffraction (SAED). Typical HR-TEM images and SAED patterns at nano-scale confirmed and showed that both particles exhibited a well-developed spinel nanocrystal with average sizes around 20-50 nm. The C-LTO particles exhibited the roughly spherical shape with more than 5 nm graphitic coating uniformly on the spherical surfaces; however, the CNT-LTO particles showed uniform square nanocrystal with edge length around 30 nm and a few layers of graphene covering the surface. Electrochemical studies of galvanostatic discharge/charge cycling capacity testing indicated that both Li4Ti5O 12particles showed the superior initial discharge capacity of more than 200 mA·h/g at 0.1C rate, and also the CNT-LTO particles show much improved specific capacity than that of the C-LTO particles during different cycling processing. It has been proposed that, grephene covering layers and the CNT interconnection networks are prove to increase electronic conductivity and improve the kinetics of Li4Ti5O12 toward fast lithium insertion/extraction. The comparative experimental results demonstrated that both nanoscale grephene layer and CNT inter-networks among particles is highly effective in improving the electrochemical properties of the CNT-LTO particles.

Original languageEnglish (US)
Title of host publicationMaterials for Vehicular and Grid Energy Storage
PublisherMaterials Research Society
Pages43-49
Number of pages7
ISBN (Print)9781632661296
DOIs
StatePublished - Jan 1 2013
Externally publishedYes
Event2013 MRS Spring Meeting - San Francisco, CA, United States
Duration: Apr 1 2013Apr 5 2013

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1541
ISSN (Print)0272-9172

Other

Other2013 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period4/1/134/5/13

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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