Research Progress on Phase Transition of Layered Cathode Materials for Sodium-ion Batteries
In recent years,the scarcity and rising prices of lithium resources have drawn attention due to the large-scale commercialization of lithium-ion batteries.Sodium-ion batteries,with abundant sodium reserves,considerable energy density,and low cost,have a promising future in large-scale energy storage applications.The cathode material is a key factor affecting the performance of sodium-ion batteries,among which the layered oxide cathode materials are highly favored due to their high specific capacity,high working voltage,and environmental friendliness.However,the harmful phase transition during the sodium insertion and extraction process leads to poor cycling performance of the battery,which hinders the large-scale application of sodium-ion batteries in energy storage systems.Therefore,this review introduces the structural classification of layered oxide cathode materials,outlines the phase transition process that occurs during sodium insertion and extraction,reveals the phase transition mechanism of layered oxide cathode materials and its influence on electrochemical performance,proposes modification strategies to suppress phase transitions,and finally provides a prospect for the application of layered oxide cathode materials.
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