Laser-Triggered High Graphitization of Mo2C@C: High Rate Performance and Excellent Cycling Stability as Anode of Lithium Ion Batteries

Hanbin Hu; Haoyi Li; Zhenghe Zhang; Wei Chen; Jikang Wang; Lifei Lian; Weimin Yang; Lei He; Yu-Fei Song

doi:10.1021/acsami.3c03663

Laser-Triggered High Graphitization of Mo₂C@C: High Rate Performance and Excellent Cycling Stability as Anode of Lithium Ion Batteries

ACS Appl Mater Interfaces. 2023 Oct 4;15(39):45725-45731. doi: 10.1021/acsami.3c03663. Epub 2023 Sep 19.

Authors

Hanbin Hu^{1

2}, Haoyi Li^{3

4}, Zhenghe Zhang³, Wei Chen^{1

2}, Jikang Wang^{1

2}, Lifei Lian^{1

2}, Weimin Yang^{3

4

5}, Lei He^{1

2}, Yu-Fei Song^{1

2}

Affiliations

¹ State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
² Quzhou Institute for Innovation in Resource Chemical Engineering, Quzhou, Zhejiang 324000, P. R. China.
³ College of Mechanical and Electronic Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
⁴ State Key Laboratory of Organic-Inorganic Composites, College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
⁵ Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

PMID: 37726219
DOI: 10.1021/acsami.3c03663

Abstract

Fast electron/ion transport and cycling stability of anode materials are key factors for achieving a high rate performance of battery materials. Herein, we successfully fabricated a carbon-coated Mo₂C nanofiber (denoted as laser Mo₂C@C) as the lithium ion battery anode material by laser carbonization of PAN-PMo₁₂ (PAN = Polyacrylonitrile; PMo₁₂ = H₃PMo₁₂O₄₀). The highly graphitized carbon layer in laser Mo₂C@C effectively protects Mo₂C from agglomeration and flaking while facilitating electron transfer. As such, the laser Mo₂C@C electrode displays an excellent electrochemical stability under 5 A g^-1, with a capacity up to 300 mA h g^-1 after 3000 cycles. Furthermore, the extended X-ray absorption fine structure results show the existence of some Mo vacancies in Mo₂C@C. Density functional theory calculations further prove that such vacancies make the defective Mo₂C@C composites energetically more favorable for lithium storage in comparison with the intact Mo₂C.

Keywords: anode material; defect; high graphitization; laser carbonization; lithium-ion batteries.