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

• 作者: Zhaoxia Qin Xinlong Liu Zhiyin Huang Rui Sun Zhiyong Li Haosen Fan Shengjun Lu
• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Special Issue:Anode Materials for Rechargeable Batteries
• 页码范围: 425-434
• 页数: 10页
• 语种: 英文

摘要

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.