Low temperature lithium manganese cobalt oxide spinels, Li4-xMn5-2xCo3xO12 (0 ≤ x ≤ 1), for use as cathode materials in rechargeable lithium batteries

A. D. Robertson, A. R. Armstrong, P. G. Bruce*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Low temperature synthesis of the lithium-rich cubic spinel Li4Mn5O12 with an oxidation state very close to +4 is described. The effect of doping this compound with cobalt according to the solid solution mechanism Li4-xMn5-2xCo3xO12 up to the solid solution limit, LiMnCoO4, has also been explored. The evolution of the structure and electrochemistry with increasing cobalt doping is described. With increasing x there is increasing population of the tetrahedral 8a site by transition metal ions reaching 25% occupancy by Co at LiMnCoO4 with corresponding displacement of Li to 16d sites. The optimum performance was obtained for the composition Li3.75Mn4.5Co0.75O12 which yields a capacity of 150 mA g-1 at a rate of 25 mA g-1 (equivalent to C/6) with no perceptible capacity loss, in sharp contrast to the pure Mn materials.
Original languageEnglish
Pages (from-to)332-335
Number of pages4
JournalJournal of Power Sources
Volume97-98
Early online date3 Jul 2001
DOIs
Publication statusPublished - Jul 2001

Keywords

  • lithium batteries
  • Lithium-rich cubic spinel
  • Lithium intercalation

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