Design of phase interface and defect in niobium-nickel oxide for ultrafast Li-ion storage  

作　　者：Haiting Chen Haoyan Cheng Hangchen Liu Yibo Hu Tongtong Yuan Shuge Dai Meilin Liu Hao Hu 

机构地区：[1]Collaborative Innovation Center of Nonferrous Metals,School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China [2]Key Laboratory of Material Physics of Ministry of Education,School of Physics and Engineering,Zhengzhou University,Zhengzhou 450052,China [3]School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,GA,30332-0245,United States of America

出　　处：《Journal of Materials Science & Technology》2023年第16期145-152,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52002119 and 52102346);the National Key R&D Program of China(No.2021YFB3400800);the Startup Funds from the Henan University of Science and Technology(Nos.13480095,13480096,13554031 and 13554032).

摘　　要：Niobium pentoxide(Nb2O5)has attracted much attention in lithium batteries due to its advantages of high operating voltage,large theoretical capacity,environmental friendliness and cost-effectiveness.However,the intrinsic poor electrical conductivity,sluggish kinetics,and large volume changes hinder its electrochemical performance at high power density,making it away from the requirements for practical applications.In this research work,we regulate the electron transport of niobium-nickel oxide(NiNbO)anode material with enhanced structural stability at high power density by constructing the two-phase boundaries between niobium pentoxide(Nb2O5)and nickel niobate(NiNb2O6)through simple solid phase reaction.In addition,the presence of lattice defects in NiNbO-F further speeds up the transport of Li+and promotes the electrochemical reaction kinetics more effectively.The two-phase boundaries and defect modulated anode material displays high Li+diffusion coefficient of 1.63×10^(−10) cm^(2) s^(−1),pretty high initial discharge capacity of 222.8 mAh g^(−1) at 1 C,extraordinary high rate performance(66.7 mAh g^(−1))at an ultrahigh rate(100 C)and ultra-long cycling stability under high rate of 25 C(83.4 mAh g^(−1) after 2000 cycles)with only 0.016%attenuation per cycle.These results demonstrate an effective approach for developing electrode materials that greatly improve rate performance and durability.

关 键 词：Niobium oxide Phase interface DEFECTS Rate performance Lithium-ion batteries 

分 类 号：TQ131.12[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]