Unlocking high-rate O3 layered oxide cathode for Na-ion batteries via ion migration path modulation
作者机构：Shaanxi Key Laboratory of Nanomaterials and NanotechnologyXi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina
出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)
年 卷 期：2023年第83卷第8期
页 面：53-61,I0004页
核心收录：
基 金：supported by Shaanxi Province (2023-ZDLGY-24,2023-JC-QN-0588) Xi’an Key Laboratory of Clean Energy(2019219914SYS014CG036) the Open Foundation of State Key Laboratory for Advanced Metals and Materials (2022-Z01)
主 题：Sodium-ion batteries Layered cathode material Fdoping Kinetic hindrance lon migration path
摘 要：O3-NaNi1/3Fe1/3Mn1/3O2is a promising layered cathode material with high specific capacity,low cost,and simple ***,sluggish kinetic hindrance is attributed to the size discrepancy between the large Na-ion and narrow tetrahedral interstitial positions,leading to inferior rate capacity and low reversible ***,F with light-weight and strong electronegativity is introduced to substitute O atoms in the bulk structure,which intensifies the bond strength of transition metal and oxygen and enlarges the Na+diffusion *** addition,density-functional theory(DFT) calculations demonstrate that the electrostatic interaction is weakened between Na+in the tetrahedral site and the transitionmetal cation directly below it,dramatically reducing the migration barriers of Na+***,the as-obtained NaNi1/3Fe1/3Mn1/3O1.95F0.05sample displays outstanding rate performance of 86.7 mA h g^(-1)at 10 C and excellent capacity retention of 84.1% after 100 cycles at 2 ***,a full cell configuration using a hard carbon anode reaches the energy density of 307.7 Wh kg^(-1).This strategy paves the way for novel means of modulating the Na-ion migration path for high-rate O3-type layered cathode materials.
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