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This study examines the microstructure of La 2 Mg 17 /Ni composites produced by ball-milling with lithium bromide, and the effect of varying this LiBr addition on the electrochemical properties of the resulting electrode material. Through this, it was found that LiBr helps prevent crystallization of the alloy, thereby refining the particle size and ensuring a uniform distribution of amorphous and nanocrystalline particles. This structure greatly improved the electrochemical properties of the composite, with the maximum discharge capacity increasing from 176.8 to 550.38 mA h/g. Further investigation of the electrochemical behaviour of the composite electrode revealed that the addition of 5 wt.% LiBr reduces the contact resistance, increases the electrochemical impedance, enhances the limiting current density and improves the charge/discharge equilibrium rate. [ABSTRACT FROM AUTHOR]