摘要
P2-type layered oxide,Na_(2/3)Ni_(1/3)Mn_(2/3)O_(2),has drawn particular interest as a promising cathode material for sodium-ion batteries(SIBs)due to its fast sodium-ion transport channels with low migration potential.However,some catastrophic flaws,such as air instability,complicated multiphase evolution,and irreversible anionic redox,limit its electrochemical performance and hinder its application.Here,an air-stable single-crystal P2-type Na_(2/3)Ni_(1/3)Mn_(1/3)Ti_(1/3)O_(2)is proposed based on the multifunctional structural modulation of Ti substitution that could alleviate the issues for practical SIBs.As a result,the cathode with high energy density shows excellent air stability and highly reversible phase transitions(P2–OP4),and delivers faster kinetics and stable anion redox chemistry.Meanwhile,a thorough investigation of the relationship between structure,function,and properties is demonstrated,emphasizing formation processes,electrochemical behavior,structural evolution,and air stability.Overall,this study provides the direction of multifunctional structural modulation for the development of high-performance sodium-based layered cathode materials for practical applications.
基金
supported by the National Natural Science Foundation of China(52250710680,51971124,52171217,52202284)
Hunan Provincial Science and Technology Innovation Major Project(2020GK1010-2020GK1014-4)
Zhejiang Provincial Natural Science Foundation(LZ21E010001,LQ23E020002)
Science and Technology Project of State Grid Corporation of China(5419-202158503A-0-5-ZN)
Wenzhou key scientific and technological innovation research projects(ZG2023053)
Wenzhou Natural Science Foundation(ZG2022032,G20220019,G20220021)
Cooperation between industry and education project of Ministry of Education(220601318235513)
State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University(EIPE22208)
the China Scholarship Council(202106370062)
Doctoral Innovation Foundation of Wenzhou University(3162023001001)。
