Statistical analysis of research of La–Mg–Ni electrode materials for nickel-metal hydride batteries for 2000–2024

The research results obtained in 2000–2024 of binary and multicomponent alloys and compounds based on rare earth metals, magnesium, and transition metals—promising hydrogen sorption materials with compositions like AB₂, AB₃, A₂B₇, A₅B₁₉, and AB₄, were statistically analyzed. About 500 scientific publications, which are available in scientometric databases such as Scopus and Web of Science, were analyzed. Research is focused on electrode materials based on La–Mg–Ni alloys. Much attention was paid to the development of materials with the highest discharge capacity and cyclic durability. Another important aspect is establishing the relationship between the composition, the component’s nature, the method of obtaining electrode materials, and their electrochemical properties. Due to the multiphase nature of most studied alloys, this relationship can be established only for a narrow range of materials. It is necessary to improve synthesis methods to obtain single-phase samples, which are currently uncommon. An analysis of the research reveals an imbalance in the study of individual electrochemical parameters of electrode materials. More interest should be paid to the kinetic properties of negative electrodes and their cyclic durability under different load modes and ambient temperatures.