First-principles prediction of layered MoO2and MoOSe as promising cathode materials for magnesium ion batteries

Jingdong Yang; Jinxing Wang; Xiao Wang; Xiaoyang Dong; Ling Zhu; Wen Zeng; Jingfeng Wang; Fusheng Pan

doi:10.1088/1361-6528/ac21f2

First-principles prediction of layered MoO₂and MoOSe as promising cathode materials for magnesium ion batteries

Nanotechnology. 2021 Sep 17;32(49). doi: 10.1088/1361-6528/ac21f2.

Authors

Jingdong Yang^{1

2}, Jinxing Wang^{1

2}, Xiao Wang^{1

2}, Xiaoyang Dong^{1

2}, Ling Zhu^{1

2}, Wen Zeng^{1

2}, Jingfeng Wang^{1

2}, Fusheng Pan^{1

2}

Affiliations

¹ School of Materials Science and Engineering, Chongqing University, Chongqing 400030, People's Republic of China.
² National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400030, People's Republic of China.

PMID: 34450609
DOI: 10.1088/1361-6528/ac21f2

Abstract

Magnesium ion battery is one of the promising next-generation energy storage systems. Nevertheless, lack of appropriate cathode materials to ensure massive storage and efficient migration of Mg cations is a big obstacle for development of Mg-ion batteries. Herein, by means of first principles calculations, the geometric structure, electronic structure, Mg intercalation behavior and Mg diffusion behavior of the layered MoO₂and two MoOSe (MoOSe(I) and MoOSe(V)) were systematically investigated. Layered MoO₂shows semiconductor properties, while MoOSe displays metallic characteristics which ensure higher conductivity. The Mg cations tend to intercalate into octahedral sites for both MoO₂and MoOSe. The maximum Mg-storage phases of the layered MoO₂, MoOSe(I) and MoOSe(V) correspond to Mg_0.666MoO₂, Mg_0.666MoOSe(I) and Mg_0.666MoOSe(V), with theoretical specific capacities of 279, 191 and 191 mAh g^-1, respectively. The calculated discharge plateaus of MoO₂and two MoOSe are all about 1 V, which ensure that the layered MoO₂and MoOSe electrodes can act as cathodes for Mg-ion batteries in the early stage. Moreover, comparing with other cathodes, the diffusion barrier of Mg cations and volume expansion during Mg intercalation process are competitive. The results suggest that layered MoO₂and MoOSe are the promising cathode materials for Mg-ion batteries.

Keywords: Mg-ion batteries; MoOSe; first principle calculations; layered MoO2.