Synthesis and electrochemical properties of novel LiFeTiO4 and Li2FeTiO4 polymorphs with the CaFe2O4-type structures
By Shaun R. Bruno and Colin K. Blakely and Jonathon B. Clapham and Joshua D. Davis and Wenli Bi and E. Ercan Alp and Viktor V. Poltavets
Published in Journal of Power Sources
NULL
2015
Abstract
The new LiFeTiO4 polymorph with the CaFe2O4-type (CF) crystal structure was synthesized via ion exchange from NaFeTiO4. Due to the presence of tunnels sufficiently large to accommodate additional Li+ ions, CF-LiFeTiO4 was studied as a model compound for potential cathode material utilizing Fe2+/Fe3+ (on Li intercalation) as well as Fe3+/Fe4+ (on Li deintercalation) redox couples. Chemical and electrochemical Li intercalation preserves the structural motif of CF-LiFeTiO4 and results in Li2FeTiO4 compound. The electrochemical cycling of CF-LiFeTiO4 vs. Li occurs between 2 and 2.3
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