Aliovalent Doping Enabled Defect Engineering of FeOF Cathode for High-Performance All-Solid-State Lithium Batteries

Qing Qiao

doi:10.1016/j.ensm.2026.105493

Aliovalent Doping Enabled Defect Engineering of FeOF Cathode for High-Performance All-Solid-State Lithium Batteries

2026-08-25

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DOI：10.1016/j.ensm.2026.105493

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• Aliovalent doping couples enhanced mixed ionic/electronic transport with improved chemo-mechanical stability in FeOF cathodes for ASSLBs. • Ni2+ substitution modifies the local electronic structure and defect chemistry, resulting in a 3.4-fold enhancement in intrinsic electronic conductivity. • The defect-modified local environment facilitates Li+ adsorption and migration, yielding a 6.5-fold increase in Li+ conductivity. • Enhanced mixed ionic/electronic transport promotes spatially uniform conversion reactions, suppressing stress accumulation and preserving solid–solid interfacial contact. • FeOF-Ni3 delivers a high-rate capacity of 319 mAh g−1 at 3 C, 75% capacity retention after 1000 cycles at 2 C, and a high energy density of 1320 Wh kgAM−1 at 0.2 C in ASSLBs.

Aliovalent Doping Enabled Defect Engineering of FeOF Cathode for High-Performance All-Solid-State Lithium Batteries

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