Direct Recycling of Spent LiFePO 4 Cathodes Through Photocatalytic Correction of Anti‐Site Defects

Abstract Fe‐Li (Fe Li) anti‐site defects, commonly observed in degraded LiFePO 4 cathodes, impede Li + mobility and disrupt the electronic pathways, leading to significant performance degradation in LFP. However, addressing Fe Li anti‐site defects to achieve direct recycling of LFP remains challenging due to Fe high migration energy barriers and the lattice distortions they induce. Here, a feasible strategy is proposed for LFP regeneration by utilizing photocatalysis to reduce the Fe migration barrier. This approach facilitates repositioning disordered Fe atoms to their designated octahedral sites while simultaneously enabling Li + diffusion into the LFP lattice, thus restoring capacity and ensuring cycling…

• NN
  National Natural Science Foundation of China

  Award: 52374410
• NS
  Natural Science Foundation of Beijing Municipality

  Award: Z220021
• NK
  National Key Research and Development Program of China

  Award: 2022YFB3305400