Spent LiFePO4 Cathodes Upcycled for Oxygen Evolution

A review published in Advanced Composites and Hybrid Materials on 30 October 2026 examines the potential of spent lithium iron phosphate (LFP) cathodes as precursors for oxygen evolution electrocatalysts. The study, authored by Han-Ming Zhang, argues that conventional metal recovery routes offer limited economic value for these waste materials. Instead, the review highlights the Fe–P framework and the structural heterogeneity induced by battery cycling as promising features for developing new electrocatalysts. This perspective shifts the focus from simple material recovery to a reconstruction-centered framework that connects battery degradation processes with catalyst evolution under anodic polarization.

The review challenges the notion that inherited defects from spent batteries are intrinsic active sites. Rather, it evaluates how cycling-induced defects, lattice disorder, phase boundaries, and vacancy chemistry regulate the susceptibility of the material to reconstruction.

The authors classify reported upcycling routes based on precursor structural continuity into three main categories. Despite their distinct starting structures, the review notes that many of these systems evolve toward Fe/Ni-based (oxy)hydroxide-rich operating interfaces. However, the specific composition, coordination environment, and reconstruction pathway remain highly dependent on the precursor chemistry and the electrochemical conditions applied.

Performance evaluation in this field extends beyond simple overpotential measurements. The review emphasizes the importance of considering feedstock origin, activation history, current density, cell voltage, temperature, and operational lifetime.

Several key unresolved challenges remain in this emerging field. These include a deeper understanding of defect–reconstruction relationships, reconstruction kinetics, and substrate-derived contributions. Feedstock variability and phosphate stability during saline electrolysis are also identified as significant hurdles. The review positions spent LFP as a reconstruction-tunable pre-catalyst platform, highlighting its potential for practical anion exchange membrane water electrolysis (AEMWE).

Subject of Research: Upcycling spent lithium iron phosphate cathodes for oxygen evolution electrocatalysis

Article Title: Reconstruction-tunable upcycling of spent LiFePO4 cathodes for oxygen evolution electrocatalysis: from defect legacy to operating active interfaces

Article References: Zhang, H.-M. (2026). Reconstruction-tunable upcycling of spent LiFePO4 cathodes for oxygen evolution electrocatalysis: from defect legacy to operating active interfaces. Advanced Composites and Hybrid Materials. https://doi.org/10.1007/s42114-026-02169-9

Image Credits: AI Generated

DOI: 10.1007/s42114-026-02169-9

Keywords: LiFePO4, Electrocatalysis, Oxygen Evolution, Battery Upcycling, AEMWE, Reconstruction, Defect Chemistry, Sustainability, Reconstruction-tunable, upcycling, spent, cathodes