Electrochemical properties of Li4Ti5O12-SnO2 composite powders prepared by scalable spray drying process

Kwang Min Yang, Young Jun Hong, Seung Ho Choi, Byung Kyu Park, Yun Chan Kang

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Spherical Li4Ti5o12-Sno2 composite powders are prepared using scalable spray drying process from a homogeneous aqueous solution. The composite powders exhibit phase purity, compositional homogeneity, unique morphology, and mixed crystal structures consisting of spinel Li4Ti5o12 and rutile Sno2 without any impurities. Nanosized Sno2 crystals are uniformly distributed throughout the spinel Li4Ti5o12 matrix. The composite powders prepared from the spray solution with 20 wt% excess Li exhibit high initial charge and discharge capacities, 639 and 439 mAh g-1, respectively, in which the Coulombic efficiency is 69%. The discharge capacity of the composite powders decreases from 439 to 359 mAh g-1 by the 30th cycle at a current density of 170 mA g-1, the capacity retention being 82%. The presence of Li4Ti5o12 phase decreases the degree of aggregation of the active Sn powders imbedded in the composite powder matrices during cycling. The stable Li4Ti5o12 matrix and hollow inner structure of the composite powders also decrease the amount of internal stress due the changes in volume in the composite powder particles during Li intercalation and deintercalation.

Original languageEnglish
Pages (from-to)1026-1040
Number of pages15
JournalInternational Journal of Electrochemical Science
Volume8
Issue number1
Publication statusPublished - 2013 Jan 1

Keywords

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

ASJC Scopus subject areas

  • Electrochemistry

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