Hollow CoSe2-ZnSe microspheres inserted in reduced graphene oxide serving as advanced anodes for sodium ion batteries

Hao Tian; Zhihua Sun; Lulin Ren; Yanchun Jin; Dong Wang; Yumeng Wei; Hao Chen; Kun Liu; Yingying Chen; Hongxun Yang

doi:10.1016/j.jcis.2023.12.125

Hollow CoSe₂-ZnSe microspheres inserted in reduced graphene oxide serving as advanced anodes for sodium ion batteries

J Colloid Interface Sci. 2024 Mar 15:658:827-835. doi: 10.1016/j.jcis.2023.12.125. Epub 2023 Dec 22.

Authors

Hao Tian¹, Zhihua Sun¹, Lulin Ren¹, Yanchun Jin¹, Dong Wang¹, Yumeng Wei¹, Hao Chen¹, Kun Liu¹, Yingying Chen¹, Hongxun Yang²

Affiliations

¹ School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China.
² School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology (JUST), Zhenjiang 212003, Jiangsu, China; Zhenjiang Runbo Electronics Technology Co., Ltd, Zhenjiang 212000, Jiangsu, China. Electronic address: yhongxun@126.com.

PMID: 38154245
DOI: 10.1016/j.jcis.2023.12.125

Abstract

Transition metal selenides are promising anode candidates for sodium ion batteries (SIBs) because of their higher theoretical capacity and conductivity than metal oxides. However, the disadvantages of severe capacity degradation and poor magnification performance greatly limit their commercial applications. Herein, we have developed a new hollow bimetallic selenides (CoSe₂-ZnSe)@reduced graphene oxide (rGO) composite with abundant heterointerfaces. The rGO could not only alleviate the volume variations of hollow CoSe₂-ZnSe microspheres during cycling, but also improve the conductivity of composite. The presence of the heterointerfaces could help to accelerate ionic diffusion kinetics and improve electron transfer, resulting in the improved sodium storage performance. As an advanced anode for SIBs, the CoSe₂-ZnSe@rGO exhibits an enhanced initial coulombic efficiency of 75.1% (65.2% of CoSe₂@rGO), extraordinary rate capability, and outstanding cycling stability (540.3 mAh/g at 0.2 A/g after 150 cycles, and 395.2 mAh/g at 1 A/g after 600 cycles). The electrochemical mechanism was also studied by kinetic analysis, showing that the charging/discharging process of CoSe₂-ZnSe@rGO is mostly related to a capacitive-controlled behavior.

Keywords: Anode; CoSe(2)-ZnSe; Reduced graphene oxide; Sodium ion batteries; Transition metal selenides.