Crystal Phase-Controlled Modulation of Binary Transition Metal Oxides for Highly Reversible Li-O2 Batteries

被引：55

作者：

Cao, Dong ^{[1
]}

Zheng, Lumin ^{[1
]}

Li, Qiaojun ^{[1
]}

Zhang, Junfan ^{[1
]}

Dong, Ying ^{[1
]}

Yue, Jiasheng ^{[1
]}

Wang, Xinran ^{[1
]}

Bai, Ying ^{[1
]}

Tan, Guoqiang ^{[1
,2
]}

Wu, Chuan ^{[1
,3
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China

[2] Beijing Inst Technol Chongqing Innovat Ctr, Chongqing 401120, Peoples R China

[3] Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China

来源：

NANO LETTERS | 2021年 / 21卷 / 12期

基金：

北京市自然科学基金;

关键词：

crystal phase engineering; transition metal oxide; cathode catalyst; charge overpotential; Li-O-2; battery; PERFORMANCE; CATALYSTS; CATHODES; CO3O4; RAMAN;

D O I：

10.1021/acs.nanolett.1c01276

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Reducing charge-discharge overpotential of transition metal oxide catalysts can eventually enhance the cell efficiency and cycle life of Li-O-2 batteries. Here, we propose that crystal phase engineering of transition metal oxides could be an effective way to achieve the above purpose. We establish controllable crystal phase modulation of the binary MnxCo1-xO by adopting a cation regulation strategy. Systematic studies reveal an unprecedented relevancy between charge overpotential and crystal phase of MnxCo1-xO catalysts, whereas a dramatically reduced charge overpotential (0.48 V) via a rational optimization of Mn/Co molar ratio = 8/2 is achieved. Further computational studies indicate that the different morphologies of Li2O2 should be related to different electronic conductivity and binding of Li2O2 on crystal facets of MnxCo1-xO catalysts, finally leading to different charge overpotential. We anticipate that this specific crystal phase engineering would offer good technical support for developing high-performance transition metal oxide catalysts for advanced Li-O-2 batteries.

引用

页码：5225 / 5232

页数：8

共 36 条

[1] First principles calculations study of α-MnO2 as a potential cathode for Al-ion battery application [J].