普鲁士蓝
四方晶系
雅恩-泰勒效应
八面体
材料科学
相(物质)
阴极
失真(音乐)
纳米技术
离子
结晶学
电化学
化学工程
化学
化学物理
晶体结构
电极
光电子学
物理化学
有机化学
工程类
放大器
CMOS芯片
作者
Yang Shang,Xiaoxia Li,Jiajia Song,Shaozhuan Huang,Zhao Yang,Zhichuan J. Xu,Hui Yang
出处
期刊:Chem
[Elsevier]
日期:2020-07-01
卷期号:6 (7): 1804-1818
被引量:154
标识
DOI:10.1016/j.chempr.2020.05.004
摘要
Summary
Mn–Fe Prussian blue analogs (PBAs) cathode materials suffer from poor cycling reversibility and capacity retention during phase transition from cubic to tetragonal phase, which is related to the large structural deformation of Mn−N6 octahedra caused by Jahn-Teller distortion. Herein, we explore a controllable strategy for creating unconventional cation Mn vacancies (VMn) on the surface of Mn–Fe PBAs by utilizing a strong chelating agent—ethylenediaminet etraacetic acid disodium. The VMn in Mn–Fe PBAs can restrain the movement of Mn−N bonds and thereby mitigate the Jahn-Teller distortion of Mn−N6 octahedra, leading to highly reversible phase transitions of Mn–Fe PBAs as well as an outstanding long-term cycling stability and capacity retention for both the half-cell (72.3% after 2,700 cycles at 0.5 A g−1) and full cell (75.5% after 550 cycles at 0.1 A g−1). This work opens up a universal avenue to explore the relationship between vacancies and electrochemical performances, even in other materials beyond PBAs.
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