Surface Engineering of Cathode Materials: Enhancing the High Performance of Lithium‐Ion Batteries

Abstract The development and application of lithium‐ion batteries present a dual global prospect of opportunity and challenge. With conventional energy sources facing reserve shortages and environmental issues, lithium‐ion batteries have emerged as a transformative technology over the past decade, owing to their superior properties. They are poised for exponential growth in the realms of electric vehicles and energy storage. The cathode, a vital component of lithium‐ion batteries, undergoes chemical and electrochemical reactions at its surface that directly impact the battery's energy density, lifespan, power output, and safety. Despite the increasing energy density of lithium‐ion batteries, their cathodes commonly encounter surface‐side reactions with the electrolyte and exhibit low conductivity, which hinder their utility in high‐power and energy‐storage applications. Surface engineering has emerged as a compelling strategy to address these challenges. This paper meticulously examines the principles and progress of surface engineering for cathode materials, providing insights into its potential advancements and charting its development trajectory for practical implementation.