文献类型：期刊文献

英文题名：Trace Ti/Mg co-doped O3-type layered oxide cathodes with enhanced kinetics and stability for sodium-ion batteries

作者：Yu, Jinxun[1];Yu, Haifeng[1,2];Zhou, Linlin[1];Cheng, Qilin[1];Jiang, Hao[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2024

卷号：649

外文期刊名：APPLIED SURFACE SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001138092800001)】；

基金：This work was supported by the National Natural Science Foundation of China (U22A20429 and 22308103) , China Postdoctoral Science Foundation (2023 M731083) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Layered oxide cathode; Heteroatoms doping; Phase transition; Cycle life; Sodium -ion batteries

摘要：O3-type layered oxide cathodes are identified as a promising cathode material for sodium-ion batteries (SIBs) due to their high specific capacity and moderate operating voltage, yet it usually suffers from sluggish Na-ion diffusion and structure instability. Herein, we demonstrate the synthesis of a trace Ti/Mg co-doped NaNi1/ 3Fe1/3Mn1/3O2 (TiMg-NFM) cathode, in which Ti-ion is distributed in transition metal layers and Mg-ion is doped into sodium layers. The co-doping can enlarge the Na-layer spacing inside the layered structure to reduce Na-ion diffusion barrier. Meanwhile, the structural stability is effectively reinforced via the stronger Ti-O bond and the pillar effect of Mg-ions, further reducing surface side reaction with electrolyte. These merits endow a high reversible capacity of the TiMg-NFM cathode with 144.5 mAh g-1 at 0.1C, and much higher capacity retention of 111.4 mAh g-1 at 5C versus the pristine NFM (62.1 mAh g-1). More impressively, 80.1% of initial capacity can be maintained after 300 cycles at 2C. This work presents a feasible strategy to enhance the reaction kinetics and structure stability for developing advanced O3-type layered oxide cathodes.