Physical Chemistry Chemical Physics, Год журнала: 2024, Номер unknown

Опубликована: Дек. 26, 2024

Improving the electronic properties of active cathode materials can significantly impact design rechargeable batteries. In this study, we investigated influence micro-strain on structural and LiFePO4 (LFP) by performing combined core-level spectroscopy analysis electrical conductivity measurements. High-resolution X-ray diffraction measurements, followed Rietveld refinement analysis, revealed an increase in unit cell parameters due to enhanced lattice structure. 57Fe Mössbauer disclosed presence Fe2+ Fe3+ distorted octahedral environments, their relative concentrations provided a comprehensive understanding structure its relationship with LFP samples. The effect samples was using absorption (XAS). valence state 3d levels vicinity Fermi level, which sensitive local distortions. obtained Fe L-edge O K-edge spectral fingerprints demonstrated micro-strain, providing valuable insights into iron, crystal field covalent character between O. unique behaviour olivine were found be directly linked changes bonding character, varied micro-strain. We propose that observed expansion is weaker hybridization eg states oxygen. reflected enhancement polaronic order magnitude highly beneficial for improving performance electrode materials.

Язык: Английский