Electrochemical and Pseudocapacitive Analysis of Rod-Like MoO2@MoSe2@NC Heterostructures for High-Performance Lithium Ion Batteries

doi:10.1007/s40195-021-01207-3

金属学报英文版 ›› 2021, Vol. 34 ›› Issue (3): 425-434.DOI: 10.1007/s40195-021-01207-3

收稿日期:2020-11-24 修回日期:2020-12-27 接受日期:2021-01-08 出版日期:2021-03-10 发布日期:2021-03-10

Electrochemical and Pseudocapacitive Analysis of Rod-Like MoO₂@MoSe₂@NC Heterostructures for High-Performance Lithium Ion Batteries

Zhaoxia Qin¹^,², Xinlong Liu², Zhiyin Huang², Rui Sun¹^,², Zhiyong Li¹^,², Haosen Fan²(), Shengjun Lu¹()

¹College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang, 550025, China
²School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, China

Received:2020-11-24 Revised:2020-12-27 Accepted:2021-01-08 Online:2021-03-10 Published:2021-03-10
Contact: Haosen Fan,Shengjun Lu
About author:Shengjun Lu, sjlu@gzu.edu.cn
Haosen Fan, hsfan@gzhu.edu.cn;
First author contact:
Zhaoxia Qin and Xinlong Liu have contributed equally to this work.

摘要/Abstract

Abstract:

A micro-scale rod-like heterostructure derived from molybdenum-based metal organic framework (Mo-MOF) has been successfully prepared via subsequent annealing treatment, which assembled from N-doped carbon encapsulated MoSe₂ nanosheets grown on the surface of MoO₂ microrod (named as MoO₂@MoSe₂@NC). For this novel heterostructure, the MoO₂ nanoparticles assembled into rod core not only serve as supporting substrate for facilitating the fast kinetics of Li⁺ cations inside the electrode but also protect the MoSe₂ structure from restacking in the charge/discharge process. Moreover, the outer-layered MoSe₂ nanosheets enable the fast lithium ion movement owing to its large interlayer spacing. Moreover, this unique rod-like core-shell structure composite could further effectively alleviate the structural strains caused by large volume expansion during charge/discharge process, thus leading to stable electrochemical performance when evaluated as anode material for lithium ion batteries. Electrochemical testing exhibits that the MoO₂@MoSe₂@NC heterostructure presents highly reversible capacity of 468 mAh g^-1 at 0.5 A g^-1 and superior rate capability (318 mAh g^-1 even at 5.0 A g^-1), which is attributed to the synergistic effect of N-doped carbon encapsulated MoSe₂ nanosheets and MoO₂ nanoparticles.

Key words: Mo-MOF, MoO₂@MoSe₂@NC, MoSe₂ nanosheet, Heterostructure, Lithium ion batteries (LIBs)

. [J]. 金属学报英文版, 2021, 34(3): 425-434.

Zhaoxia Qin, Xinlong Liu, Zhiyin Huang, Rui Sun, Zhiyong Li, Haosen Fan, Shengjun Lu. Electrochemical and Pseudocapacitive Analysis of Rod-Like MoO₂@MoSe₂@NC Heterostructures for High-Performance Lithium Ion Batteries[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(3): 425-434.

图/表 7

Fig. 1 Schematic illustration of the preparation of MoO2@MoSe2@NC heterostructures

Fig. 2 SEM images of Mo-MOF a, and pure MoO2@NC composite b, c; d XRD patterns of MoO2@MoSe2@NC composite annealed at different temperatures

Fig. 3 SEM images of MoO2@MoSe2@NC composite annealed at different selenization temperatures: a-c 500 °C, d-f 600 °C, g-i 700 °C, respectively

Fig. 4 High resolution XPS spectra: a Mo 3d; b Se 3d; c O 1 s; d C 1 s peaks of MoO2@MoSe2@NC heterostructures

Fig. 5 a CV curves of MoO2@MoSe2@NC in the three cycles at a scan rate of 0.1 mV s-1; b-d Charge and discharge profiles of MoO2@MoSe2@NC in the first 50 cycles at the current density of 0.2 A g-1 at 500, 600, 700 ℃, respectively

Fig. 6 a Rate performance of MoO2@MoSe2@NC at different annealing temperatures; b-d Charge and discharge profiles of MoO2@MoSe2@NC under various current densities at 500, 600, 700 ℃, respectively; e Cycling performance of MoO2@MoSe2@NC electrodes at a current density of 0.5 A g-1

Fig. 7 Kinetics investigation of MoO2@MoSe2@NC: a CV curves at different scan rates; b Corresponding ln (peak current) versus ln (scan rate) plots at different redox states; c Bar chart of the percent of pseudocapacitive contribution at different scan rates; d CV curve of the pseudocapacitive fraction shown by the purple region at a scan rate of 0.6 mV s-1

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Electrochemical and Pseudocapacitive Analysis of Rod-Like MoO₂@MoSe₂@NC Heterostructures for High-Performance Lithium Ion Batteries

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