LAUSR

Abstract Structural stability and high ionic and electronic conductivity are crucial for the performance of Li-ion batteries. To improve the electrochemical performance of Li-rich Mn-based cathode material, we have adopted a combination of bulk doping and surface coating rather than a single modification, thereby enhancing structural stability and conductivity. This combination is achieved tactfully by one-step method using surface coating on hollow material. After coating and treatment at high temperature, elements from coating layer substitute transition metal elements and distribute gradiently throughout the entire shell of cathode material, showing collective advantages of element doping and surface coating. The modified samples show enhanced rate capability and cycling stability. We discuss the relationship between battery performance and structural improvement.