Electrochemical properties of spherical hollow composite powders with various Li4Ti5O12/SnO2 ratios prepared by spray pyrolysis

Kwang Min Yang, Yun Chan Kang, Sang Mun Jeong, Yun Ju Choi, Yang Soo Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Li4Ti5O12-SnO2 composite powders with different Li4Ti5O12/SnO2 ratios and comprising hollow and sphere particles are prepared by an ultrasonic spray pyrolysis process. The composite powders exhibit mixed-crystal structures consisting of Li4Ti5O12 and SnO2 phases with no impurities being present, irrespective of their Li4Ti5O12/SnO2 ratios. The composite powders with low concentrations of SnO2 contained SnO2 nanocrystals several tens of nanometers in size, which are uniformly distributed in the Li4Ti5O12 matrix. Complete necking between the SnO2 nanocrystals results in an increase in the electrical conductivity of the composite powder with a high concentration of SnO2 (Li4Ti5O12/SnO2 = 0.4/0.6). These composite powders exhibit a high initial charge capacity of 730 mAh g-1 and good cyclability even at a high charge-and-discharge rate of 700 mA g-1 for voltages between 0.1 and 2.5 V. In addition, it retained 70% of its initial capacity after 60 cycles. The initial charge capacities of this composite powder are 572, 399, and 303 mAh g-1 at the extremely high charge-and-discharge rates of 3500, 7000, and 14000 mA g-1, respectively.

Original languageEnglish
Pages (from-to)11972-11983
Number of pages12
JournalInternational Journal of Electrochemical Science
Volume8
Issue number10
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Composite powders
  • Electrochemical properties
  • Lithium titanate
  • Spray pyrolysis
  • Tin oxide

ASJC Scopus subject areas

  • Electrochemistry

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