Structure and Electrochemical Behavior of ZnLaFeO 4 Alloy as a Negative Electrode in Ni-MH Batteries

Houyem Gharbi, Wissem Zayani, Youssef Dabaki, Chokri Khaldi, Omar ElKedim, Nouredine Fenineche () and Jilani Lamloumi
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Houyem Gharbi: Laboratoire de Mécanique, Matériaux et Procédés LR99ES05, Ecole Nationale Supérieure d’Ingénieurs de Tunis, Université de Tunis, Tunis 1008, Tunisia
Wissem Zayani: Laboratoire de Mécanique, Matériaux et Procédés LR99ES05, Ecole Nationale Supérieure d’Ingénieurs de Tunis, Université de Tunis, Tunis 1008, Tunisia
Youssef Dabaki: Laboratoire de Mécanique, Matériaux et Procédés LR99ES05, Ecole Nationale Supérieure d’Ingénieurs de Tunis, Université de Tunis, Tunis 1008, Tunisia
Chokri Khaldi: Laboratoire de Mécanique, Matériaux et Procédés LR99ES05, Ecole Nationale Supérieure d’Ingénieurs de Tunis, Université de Tunis, Tunis 1008, Tunisia
Omar ElKedim: FEMTO-ST, MN2S, UMLP, UTBM, 90000 Belfort, Cedex, France
Nouredine Fenineche: ICB-PMDM/FR FCLAB, UMLP, UBE, UTBM, 90000 Belfort, Cedex, France
Jilani Lamloumi: Laboratoire de Mécanique, Matériaux et Procédés LR99ES05, Ecole Nationale Supérieure d’Ingénieurs de Tunis, Université de Tunis, Tunis 1008, Tunisia

Energies, 2025, vol. 18, issue 13, 1-18

Abstract: This study focuses on the structural and electrochemical behavior of the compound ZnLaFeO 4 as a negative electrode material for nickel–metal hydride (Ni-MH) batteries. The material was synthesized by a sol–gel hydrothermal method to assess the influence of lanthanum doping on the ZnFe 2 O 4 spinel structure. X-ray diffraction revealed the formation of a dominant LaFeO 3 perovskite phase, with ZnFe 2 O 4 and La 2 O 3 as secondary phases. SEM analysis showed agglomerated grains with an irregular morphology. Electrochemical characterization at room temperature and a discharge rate of C/10 (full charge in 10 h) revealed a maximum discharge capacity of 106 mAhg −1 . Although La 3+ doping modified the microstructure and slowed the activation process, the electrode exhibited stable cycling with moderate polarization behavior. The decrease in capacity during cycling is due mainly to higher internal resistance. These results highlight the potential and limitations of La-doped spinel ferrites as alternative negative electrodes for Ni-MH systems.

Keywords: electrochemical performances; structural properties; Ni-MH batteries; spinel ferrite; LaZnFeO 4 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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