Research progress in nickel-rich layered cathode materials cycling stability for lithium-ion batteries

Abstract

The nickel-rich layered cathode materials LiNixM1-xO2 （x>0.8，M=Co，Mn，Al，etc.） have become the most promising cathode materials for hybrid electric vehicles and electric vehicle （EV） high energy density lithium-ion batteries in recent years due to its high specific capacity， high operating voltage， and low cost. The further development of electric vehicle technology requires the commercial application of lithium-ion batteries with a high energy density of approximately 350 Wh·kg-1 and a range of 500 km. However， the rapid capacity decay and structural instability of nickel-rich layered cathode materials hinder their market application. In this paper， the fundamental issue of performance degradation in nickel-rich layered cathode materials was summarized， and the latest progress and perspectives in improving the cycling stability of nickel-rich layered cathode materials through element doping， element ratio，surface reconstruction， particle arrangement，interparticle filling，particle size， single crystal transformation，and other aspects were summarized. It is pointed out that efforts could be made to construct high structural strength nickel-rich cathode materials through the coordination of elements and structures to fundamentally solve the structural and thermal stability problems under deep delithiated state， providing modified new processes and methods for nickel-rich layered cathode materials.

Keywords

• nickle-rich layered cathode
• lithium-ion battery
• structural stability
• cyclic stability