层状/橄榄石混合正极材料的研究进展:从机制协同到性能增强OA

Cathode materials are critical to determining the upper performance limit of lithium-ion batteries.However,single cathode materials cannot meet the multidimensional requirements of energy storage systems in terms of energy density,cycle life,cost,safety,and environmental adaptability.Layered/olivine blended cathode materials combine the high energy density of layered oxides with the high safety and long cycle life olivine phosphate materials,achieving performance complementarity while retaining the intrinsic advantages of each component.As a result,they have become an effective strategy for overcoming this technical bottleneck.This paper systematically reviews recent progress in layered/olivine blended cathode materials.First,it briefly summarizes the crystal structure characteristics and electrochemical behaviors of layered oxides and olivine phosphates.Based on this foundation,it examines key issues such as particle size matching and voltage platform compatibility when these two materials are combined.It also outlines the development history and briefly describes two typical preparation strategies for layered/olivine blended cathode materials.Furthermore,the synergistic mechanisms of the blended system are analyzed from three aspects:interface stability,structural reinforcement,and kinetic optimization.The core contributions of this strategy in suppressing interfacial side reactions,alleviating detrimental phase transitions,and enhancing electrochemical reaction kinetics are also discussed.Specifically,the olivine component helps regulate and stabilize the interfacial behavior of layered materials through physical isolation and interfacial modulation across contact interfaces,active regions,and film-forming layers.Owing to their rigid polyanion framework,these materials provide multidimensional structural reinforcement to the blended system at the atomic,grain,and electrode scales.At the same time,by forming a kinetic synergy with layered materials,they significantly improve the electrochemical reaction kinetics of the electrode in terms of structural basis,thermodynamic equilibrium,and dynamic process.It should be noted that these three mechanisms do not operate in isolation;rather,they interact through coupling and feedback regulation to form a multiscale synergistic enhancement effect,thereby significantly improving the overall electrochemical performance of the blended system.Finally,in view of current energy storage trends,this review discusses the potential of this type of material system in large-scale energy storage and emerging battery systems such as solid-state batteries,summarizing future research directions and development requirements the aim of providing material support and theoretical guidance for next-generation high-performance energy storage batteries.