High‐Entropy Alloys for Cathode, Electrolyte, and Anode Applications in Lithium–O ₂ Batteries

Lithium–oxygen (Li–O 2 ) batteries have attracted substantial interest due to their high theoretical specific energy and environmental benignity. However, their practical electrochemical performance remains hampered by sluggish cathode reaction kinetics, unstable solid electrolyte interphase (SEI) at electrode/electrolyte interfaces, and lithium dendrite growth. Addressing these system‐wide challenges necessitates the development of novel functional materials as a pivotal strategy. Among explored materials, high‐entropy alloys (HEAs) demonstrate significant advantages through finely tunable composition and electronic structure, enabling synergistic functionality that offers new pathways for enhancing the comprehensive performance of Li–O 2 batteries. This review outlines the fundamental reaction mechanisms and core challenges of Li–O 2 batteries, and then systematically examines recent advances in HEA applications across three critical domains: cathode catalyst design, electrolyte optimization, and anode protection. Finally, perspectives on future research directions for HEAs in Li–O 2 batteries are offered.