Influence of Cation Substitution on Cycling Stability and Fe-Cation Migration in Li₃Fe_3-xM_xTe₂O₁₂ (M = Al, In) Cathode Materials.

ABSTRACT: Li₃Fe₃Te₂O₁₂ adopts a crystal structure, described in space group Pnnm, related to that of LiSbO₃, in which Te⁶⁺, Fe³⁺, and Li⁺ cations reside in a partially ordered configuration within an hcp array of oxide ions. Chemical or electrochemical insertion of lithium is accompanied by a fully reversible migration of some of the Fe cations with an initial capacity of 120 mA h g^-1 (2.85 Li per formula unit). Long-term cycling stability is limited by the facile reduction of Te⁶⁺ to elemental Te, which leads to cathode decomposition. Partial substitution of Fe by In suppresses Te⁶⁺ reduction, such that Li₃Fe₂InTe₂O₁₂ shows no si

SUBMITTER: Martinez de Irujo Labalde X 

PROVIDER: S-EPMC10792598 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature