Using High-Entropy Configuration Strategy to Design Na-Ion Layered Oxide Cathodes with Superior Electrochemical Performance and Thermal Stability

被引：323

作者：

Ding, Feixiang ^{[1
,2
]}

Zhao, Chenglong ^{[1
]}

Xiao, Dongdong ^{[1
]}

Rong, Xiaohui ^{[1
,2
,3
,4
]}

Wang, Haibo ^{[1
]}

Li, Yuqi ^{[3
]}

Yang, Yang ^{[1
,3
]}

Lu, Yaxiang ^{[1
,2
]}

Hu, Yong-Sheng ^{[1
,2
,3
,4
]}

机构：

[1] Chinese Acad Sci, Key Lab Renewable Energy, Beijing Key Lab New Energy Mat & Devices, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Huairou Div, Beijing 101400, Peoples R China

[3] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China

[4] Yangtze River Delta Phys Res Ctr Co Ltd, Liyang 213300, Peoples R China

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2022年 / 144卷 / 18期

基金：

中国博士后科学基金;

关键词：

PHASE;

D O I：

10.1021/jacs.2c02353

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Na-ion layered oxide cathodes (NaxTMO2, TM = transition metal ion(s)), as an analogue of lithium layered oxide cathodes (such as LiCoO2, LiNixCoyMn1-x-yO2), have received growing attention with the development of Na-ion batteries. However, due to the larger Na+ radius and stronger Na+-Na+ electrostatic repulsion in NaO2 slabs, some undesired phase transitions are observed in NaxTMO2. Herein, we report a high-entropy configuration strategy for NaxTMO2 cathode materials, in which multicomponent TMO2 slabs with enlarged interlayer spacing help strengthen the whole skeleton structure of layered oxides through mitigating Jahn-Teller distortion, Na+/vacancy ordering, and lattice parameter changes. The strengthened skeleton structure with a modulated particle morphology dramatically improves the Na+ transport kinetics and suppresses intragranular fatigue cracks and TM dissolution, thus leading to highly improved performances. Furthermore, the elaborate high-entropy TMO2 slabs enhance the TM-O bonding energy to restrain oxygen release and thermal runaway, benefiting for the improvement of thermal safety.

引用

页码：8286 / 8295

页数：10

共 45 条

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