Electrochemical hydrogenation of LaNi5 based alloys doped with Zr, Mg and Al or Ga

Анотація

Nickel-metal hydride batteries attract considerable attention as secondary sources of electrical energy due to their relatively high current density and environmental safety. However, despite their advantages (high power, durability, resistance to temperature fluctuations, low resistance, no memory effect, and environmental friendliness), nickel-metal hydride batteries have a number of disadvantages. In particular, in devices with high energy consumption, such as electric vehicles, they do not provide sufficient discharge capacity. A classic anode material widely used in Ni–MH batteries is a binary intermetallic LaNi₅ or its doped derivatives. However, the actual energy capacity of the binary phase is significantly lower from the theoretical one, which is due to electrode degradation and passivation of its surface in an alkaline electrolyte [1]. Therefore, the main objective of the work is to form high-entropy systems to improve the stability, sorption and electrochemical characteristics of the anode materials. An additional objective was to determine which dopants are more effective: aluminium or gallium.