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Alkali hexatitanates—A2Ti6O13(A = Na, K) as host structure for reversible lithium insertion

Authors
Journal
Journal of Power Sources
0378-7753
Publisher
Elsevier
Publication Date
Volume
174
Issue
2
Identifiers
DOI: 10.1016/j.jpowsour.2007.06.181
Keywords
  • Na2Ti6O13
  • K2Ti6O13
  • Titanium Oxide
  • Lithium Insertion
  • Li-Ion Batteries
Disciplines
  • Chemistry

Abstract

Abstract Electrochemical lithium insertion into two isostructural titanium-based oxides, K 2Ti 6O 13 and Na 2Ti 6O 13 has been investigated. Although the two compounds differ mainly from their particle size and cell volume, pronounced differences in the insertion mechanism have been evidenced. They can accommodate about three Li per formula unit at relatively low potentials (1.5–0.9 V versus Li reference), which qualifies them as potential alternatives to Li 4Ti 5O 12. The main limitations are their rate capabilities and capacity retention related to large particles and parasitic electrolyte decomposition, respectively.

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