Tailoring Na^(+) Diffusion Kinetics and Structural Stability of P2-Layered Material by W-Lattice Doping  

作　　者：Hang Fan Lei Xu Ying Lei Jianying Li Tinghong Huang Weifeng Fan Yun Zhang 

机构地区：[1]College of Chemical Engineering,Sichuan University of Science and Engineering,Zigong,Sichuan 643000,China [2]College of Materials Science and Engineering,Sichuan University,No.24 South Section 1,Yihuan Road,Chengdu,Sichuan 610065,China

出　　处：《Chinese Journal of Chemistry》2025年第4期399-407,共9页中国化学(英文版)

基　　金：supported by the Talent Recruitment Program of Sichuan University of Science and Engineering(2023RC06);the Innovation Center for Chenguang High-Performance Fluorine Material(SCFY2207);the Key Laboratories of Fine Chemicals and Surfactants in Sichuan Provincial Universities(2022JXY04);College Students Innovation and Entrepreneurship Training Program(S20221062208,S202010622054);the Scientific Research and Innovation Team Program of Sichuan University of Science and Engineering(SUSE652B008);the Central Government Guide Local Science and Technology Development Fund(24ZYTXJS0055).

摘　　要：The pursuit of advanced sodium-ion batteries(SIBs)has been intensified due to the escalating demand for sustainable energy storage solutions.A W-doped P2-type layered cathode material,Na_(0.67)Ni_(0.246)W_(0.004)Mn_(0.75)O_(2)(NNWMO),has been developed to address the limitations of traditional cathode materials.Compared to the pristine Na_(0.67)Ni_(0.25)Mn_(0.75)O_(2)(NNMO),NNWMO exhibits improved reversible capacity,excellent cycle performance,and remarkable rate performance.It can deliver an increased discharge capacity of 142.20 mAh/g at 0.1 C,with an admirable capacity retention of 80.5% after 100 cycles at high voltage.In situ XRD results demonstrate that the rivet effect related to the strong W—O bonds inhibits irreversible phase transition and enhances structural reversibility during charge/discharge processes.High-resolution scanning transmission electron microscopy and X-ray diffraction results confirm successful lattice doping of W^(6+)and increased layer spacing,contributing to favorable sodium ion diffusion kinetics.Density-functional theory(DFT)calculation results further reveal that the smoother Na+ion diffusion dynamics is attributed to the reduced migration energy barrier of Na^(+)with the insertion of W^(6+).This study provides valuable insights into the design of high-performance cathode materials for next-generation SIBs,showcasing the potential for more efficient,stable,and enduring energy storage solutions.

关 键 词：P2-type cathodes Sodium-ion batteries W lattice doping Na^(+)diffusion kinetics Na_(0.67)Ni_(0.25)Mn_(0.75)0_(2) Phase transition 

分 类 号：TM9[电气工程—电力电子与电力传动]