The mystic role of high-entropy designs in rechargeable metal-ion batteries: A review

Rechargeable metal-ion batteries, such as lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), have raised more attention because of the large demand for energy storage solutions. Undoubtedly, electrode materials and electrolytes are key parts of batteries, exhibiting critical influence on the reversible capacity and span life of the metal-ion battery. Nonetheless, researchers commonly express concerns regarding the stability of both electrodes and electrolytes. Given its commendable stability attributes, high-entropy materials have garnered widespread acclaim and have been applied in many fields since their inception, notably in energy storage. However, while certain high-entropy designs have achieved substantial breakthroughs, some have failed to meet anticipated outcomes within the high energy density energy storage materials. Moreover, there is a lack of comprehensive research on the corresponding mechanisms and design principles of high-entropy designs. This review examines the current high-entropy designs for cathodes, anodes, and electrolytes, aiming to summarize the design principle, potential mechanisms, and electrochemical performance. We focus on their structural characteristics, interface characteristics, and prospective development trends. At last, we provide a fair evaluation alongside succinct development suggestions.