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The microstructures and electrochemical properties of LaNi3.8-xAlx (x=0.0,0.1,0.2,0.3 and 0.4) alloys were studied systematically. The microstructures were identified by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The main phases were not changed with the substitution of Ni by Al, but minor phases appeared when x=0.4. With Al content increasing, the cell volume increased and the hydrogen storage capacity increased first and then decreased, and the maximum discharge capacity increased from 209.4 mAh/g (x=0.0) to 285.3 mAh/g (x=0.3) and then decreased to 241.3 mAh/g (x=0.4). Meanwhile, the exchange current density (I0) increased and the diffusion coefficient (D) decreased with the addition of Al.
The microstructures were identified by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The microstructures and electrochemical properties of LaNi3.8-xAlx (x = 0.0,0.1,0.2,0.3 and 0.4) main phases were not changed with the substitution of Ni by Al, but minor part has x = 0.4. With Al content increasing, the cell volume increased and the hydrogen storage capacity increased first and then decreased, and the maximum discharge capacity increased from 209.4 The exchange current density (I0) increased and the diffusion coefficient (D) decreased from 241.3 mAh / g (x = 0.4). with the addition of Al.