Unveiling the effect of molybdenum and titanium co-doping on degradation and electrochemical performance in Ni-rich cathodes  

作　　者：Imesha Rambukwella Konstantin L.Firestein Yanan Xu Ziqi Sun Shanqing Zhang Cheng Yan 

机构地区：[1]School of Mechanical,Medical,and Process Engineering,Queensland University of Technology,Brisbane,QLD,4000,Australia [2]Centre for Material Science,Queensland University of Technology,Brisbane,QLD,4000,Australia [3]Central Analytical Research Facility,Queensland University of Technology,Brisbane,QLD,4000,Australia [4]School of Chemistry and Physics,Queensland University of Technology,Brisbane,QLD,4000,Australia [5]Institute for Sustainable Transformation,School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou,510006,China

出　　处：《Materials Reports(Energy)》2025年第1期32-42,共11页材料导报(能源)(英文)

基　　金：support from Queensland University of Technology,Brisbane,Queensland,Australia;financial support from ARC Discovery Project(DP210103266).

摘　　要：In this work,we have applied molybdenum(Mo)and titanium(Ti)co-doping to solve the degradation of Ni-rich cathodes.The modified cathode,i.e.,Li(Ni_(0.89)Co_(0.05)Mn_(0.05)Mo_(0.005)Ti_(0.005))O_(2) holds a stable structure with expanded crystal lattice distance which improves Li ion diffusion kinetics.The dopants have suppressed the growth of primary particles,formed a coating on the surface,and promoted the elongated morphology.Moreover,the mechanical strength of these particles has increased,as confirmed by the nanoindentation test,which can help suppress particle cracking.The detrimental H2-H3 phase transition has been postponed by 90 mV allowing the cathode to operate at a higher voltage.A better cycling stability over 100 cycles with 69%capacity retention has been observed.We believe this work points out a way to improve the cycling performance,Coulombic efficiency and capacity retention in Ni-rich cathodes.

关 键 词：Ni-rich cathode Mo doping Ti doping DEGRADATION Unsymmetrical phase transition Mechanical stress Particle cracking 

分 类 号：O646[理学—物理化学]