材料科学
空位缺陷
阴极
氧化物
水分
钠
化学工程
氧化钠
能量密度
固态
结构稳定性
复合材料
物理化学
结晶学
冶金
工程物理
化学
结构工程
工程类
作者
Zhuang‐Chun Jian,Yi‐Feng Liu,Yanfang Zhu,Jiayang Li,Haiyan Hu,Jingqiang Wang,Ling‐Yi Kong,Xin‐Bei Jia,Hanxiao Liu,Juchen Guo,Mengying Li,Yan‐Song Xu,Jianfeng Mao,Shilin Zhang,Yu Su,Shixue Dou,Shulei Chou,Yao Xiao
出处
期刊:Nano Energy
[Elsevier]
日期:2024-06-01
卷期号:125: 109528-109528
标识
DOI:10.1016/j.nanoen.2024.109528
摘要
Manganese-based layered oxides show promise as cathode materials for sodium-ion batteries (SIBs). However, several challenges including sluggish Na+ kinetics, complex phase transitions, and poor air stability hinder their practical application. Herein, we proposed a dual-function strategy that not only precisely manipulates dynamic structural evolution from layered to tunnel structure, but also effectively suppresses Na+/vacancy and charge ordering by inhibiting electron delocalization. A series of Ti-substituted Na2/3Mn1-xTixO2 (x=0, 1/9, 2/9, 1/3) as proof of concept materials were designed to demonstrate the dual-function strategy. As a result, the optimized Na2/3Mn8/9Ti1/9O2 cathode material delivers a high specific capacity of 202.9 mAh g−1 at 0.1 C within 1.5−4.3 V, equivalent to 536.6 Wh kg−1 of energy density, and exhibits 71.0% of capacity retention after 300 cycles at 1 C. Meanwhile, a highly reversible P2/Tunnel-OP4/Tunnel phase transition process and interlocking effect between the layered and tunnel structure as well as prominent moisture stability even after soak water treatment are further confirmed by in-situ charge and discharge XRD and other advanced characterization techniques. It is worth noting that the electrode assembled with water-solution binder still displays a high capacity retention of 85.4% after 400 cycles at 1 C. Our dual-function strategy provides valuable guidance for developing high-energy density and water-stable practical SIB cathode materials.
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