Speaker
Description
The sustainable transformation of industrial sectors and metallurgy is closely linked to the implementation of hydrogen technologies. However, the efficient operation of hydrogen technological systems (such as electrolyzers and fuel cells) relies on secondary energy storage systems capable of balancing dynamic power surges. Lithium-ion batteries (LIBs) integrated into these hybrid hydrogen frameworks require a new generation of electrode materials featuring high capacity and extended lifespan.
This work focuses on the synthesis and electrochemical characterization of single-phase high-entropy perovskite $La(Co_{0,2}Mn_{0,2}Fe_{0,2}Ni_{0,2}Cu_{0,2})O_{3}$ (HEP), prepared via spray drying of an aqueous metal nitrate solution followed by calcination at temperatures ranging from 800 to 1100∘C. The study investigates its stability during rate capability testing.
Electrochemical testing revealed a unique phenomenon of in-situ electrochemical activation. Following the initial cycles, a progressive increase in specific discharge capacity was observed across all calcination conditions, with the sample calcinated at 1100∘C for 1 hour demonstrating the highest capacity. This mechanism, associated with controlled particle pulverization and the evolution of a stable solid electrolyte interphase (SEI) layer (confirmed by SEM surface analysis), opens new avenues for pseudocapacitive charge storage.
This paper provides a detailed analysis of the material's stability over 150 cycles. The findings demonstrate that the entropy-stabilization effect effectively suppresses degradation mechanisms in conversion anodes, making this perovskite a promising candidate for battery subsystems that ensure the stability and operational continuity of advanced hydrogen energy networks.
