MoO42--mediated engineering of Na3V2(PO4)3 as advanced cathode materials for sodium-ion batteries

Xiao Liu; Juan Gong; Xijun Wei; Ling Ni; Houyang Chen; Qiaoji Zheng; Chenggang Xu; Dunmin Lin

doi:10.1016/j.jcis.2021.10.007

MoO₄^2--mediated engineering of Na₃V₂(PO₄)₃ as advanced cathode materials for sodium-ion batteries

J Colloid Interface Sci. 2022 Jan 15;606(Pt 2):1897-1905. doi: 10.1016/j.jcis.2021.10.007. Epub 2021 Oct 6.

Authors

Xiao Liu¹, Juan Gong¹, Xijun Wei², Ling Ni³, Houyang Chen⁴, Qiaoji Zheng¹, Chenggang Xu¹, Dunmin Lin⁵

Affiliations

¹ College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China.
² State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, PR China. Electronic address: xijunwei1992@swust.edu.cn.
³ Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China. Electronic address: niling@qibebt.ac.cn.
⁴ Department of Chemical and Biological Engineering, State University of New York at Buffalo, Buffalo, NY 14260-4200, USA.
⁵ College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, PR China. Electronic address: ddmd222@sicnu.edu.cn.

PMID: 34689046
DOI: 10.1016/j.jcis.2021.10.007

Abstract

Sodium vanadium phosphate [Na₃V₂(PO₄)₃] with high voltage platform, low cost and environment friendliness has been considered as one of the most promising candidates as cathodes for high-performance sodium-ion batteries. However, the sodium storage property of Na₃V₂(PO₄)₃ is limited because of its low electronic conductivity and poor kinetic performance. Herein, MoO₄^2--doped Na_(3+2x)V₂(PO₄)_(3-x)MoO_4(x) [NVP-MoO₄ (x), x = 0, 0.05, 0.10, 0.15] have been developed and prepared by a feasible solid-state reaction. The optimal NVP-MoO₄ (0.10) delivers a high initial capacity of 108.9 mA h g^-1 and presents an excellent capacity retention of 91.5% at 1 C after 150 cycles. In addition, the NVP-MoO₄ (0.10) shows a good rate capability, delivering a relatively high capacity of 84.2 mA h g^-1 at 50 C. The results of sodium storage measurement and density of states calculation indicate that MoO₄^2- doping can significantly enhance the structural stability, promote the kinetics behavior and boost the electronic conductivity of the materials. In-situ XRD test reveals that the electrochemical reaction of the NVP-MoO₄ (0.10) exhibits a highly reversible phase transition process. This work provides a new insight for the design of advanced cathodes for high-performance sodium-ion batteries by the strategy of unique anion doping.

Keywords: Electrochemical performance; In-situ XRD; MoO(4)(2−) doping; Sodium vanadium phosphate; Sodium-ion batteries.