Effects of atmospheric Ti (III) reduction on Nb2O 5-doped Li4Ti5O12 anode materials for lithium ion batteries

Seul Ki Kim, Eun Seok Kwon, Tae Heui Kim, Jooho Moon, Joosun Kim

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16 Citations (Scopus)

Abstract

The effects of atmospheric annealing on electrochemical performance for Nb2O5-doped Li4Ti5O12 anode materials have been investigated. The annealing of Nb2O 5-doped Li4Ti5O12 in Ar-gas suppressed the capacity fade, under the condition of a high charge-discharge rate, by virtue of an enhanced exchange reaction at the electrode/electrolyte interface. Under Ar-gas, Nb2O5-doped Li4Ti 5O12 was primarily reduced to increase the density of Ti3+ ions. This caused expansion of the Li4Ti 5O12 lattice, but had little impact on Li-ion diffusion into the lattice. When concurrent doping and annealing induced such compositional and electrical modification of Li4Ti5O 12, the polarization resistance of exchange reactions at the electrode/electrolyte interface decreased. Therefore, we have demonstrated that annealing in Ar-gas is capable of decreasing the resistance of exchange reactions at the electrode/electrolyte interface.

Original languageEnglish
Pages (from-to)8869-8874
Number of pages6
JournalCeramics International
Volume40
Issue number6
DOIs
Publication statusPublished - 2014 Jul

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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