Promoting cationic redox and stabilizing lattice oxygen in an Fe-based DRX cathode by the synergy of initial Li deficiency and 3D hierarchical porous architecture.

ABSTRACT: Anionic and cationic redox chemistries boost the ultrahigh specific capacity of Fe-based disordered rock salt (DRX) Li₂FeTiO₄. However, the sluggish kinetics and high O redox activity result in continuous capacity decay and poor rate performance. Herein, 3D hierarchical porous Li₂FeTiO₄ (H-Ca-LFT) with initial Li-deficiency is successfully prepared using an acid-assisted CaCO₃ template method. By introducing Li deficiency, the local electronic structure of Li₂FeTiO₄ is modulated to facilitate Li⁺ diffusion and regulate the redox activity. Specifically, Li deficiency reduces the density of states in the O 2p band, Li⁺ diffusion barrier, and band gap, thereby suppressing the high activity of ox

SUBMITTER: Ma W 

PROVIDER: S-EPMC12278834 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature