Improvement of electrochemical performances of ultrathin Ti-coated Si-based multilayer nanofibers as anode materials for lithium-ion batteries

• Published in: Surface & coatings technology Vol. 424; p. 127669
• Main Authors: Qiao, Li, Yang, Zhibo, Li, Xiuwan, He, Deyan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 25.10.2021; Elsevier BV
• Subjects: Anodes; Electrochemical analysis; Electrode materials; Electrodes; Electron beams; Electron-beam physical vapor deposition; Electrospinning; Lithium; Lithium-ion batteries; Multilayered structure; Multilayers; Nanofibers; Physical vapor deposition; Plasma enhanced chemical vapor deposition; Rechargeable batteries; Silicon; Silicon anode materials; Ti-coated; Titanium; Electrospinning; lithium ion batteries; Silicon anode materials; Ti-coated; Nanofibers; Multilayered structure
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2021.127669

Fullerene-like carbon core/silicon shell (FLC/Si) nanofibers are prepared via an electrospinning method followed by plasma-enhanced chemical vapor deposition technology. Then, a thin metal Ti layer is coated by electron beam physical vapor deposition. The multilayer FLC/Si/Ti electrode exhibits remarkably improved electrochemical properties as a lithium-ion battery anode compared to the uncoated anode, i.e., a higher initial Coulombic efficiency, more stable cycle performance, higher capacity and excellent rate capability (capacity over 1000 mA h g−1 at 3200 mA g−1). These improved electrochemical performances of the multilayer FLC/Si/Ti electrode can be attributed to the presence of a Ti layer on the surface of the electrode. •A thin metal Ti layer is coated by electron beam physical vapor deposited technology.•Ti-coated FLC/Si nanofibers show better electrochemical performance, especially the rate performance.•The Ti shell can improve the electrical conductivity of the electrode.