Coaxially Integrating TiO2/MoO3 into Carbon Nanofibers via Electrospinning towards Enhanced Lithium Ion Storage Performance. Issue 11 (17th March 2020)

• Record Type: Journal Article
• Authors: Xie, Sanmu; Yao, Tianhao; Wang, Jinkai; Alsulami, Hamed; Kutbi, Marwan A.; Wang, Hongkang
• Is Part Of: ChemistrySelect. Volume 5:Issue 11(2020)
• Page Start: 3225
• Page End: 3233
• Publication Date: 2020-03-17
• Subjects: Carbon nanofibers -- Coaxial electrospinning -- Core-shell -- Lithium ion batteries -- TiO2/MoO3; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202000288
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Conversion‐type transition metal oxide MoO3 has attracted considerable interest as a promising anode material for lithium ion batteries (LIBs), but it suffers from the low electronic conductivity and the large volume changes upon lithiation/delithiation. To overcome these drawbacks, we herein report the full encapsulation of core‐shelled MoO3 ‐TiO2 into the carbon nanofibers (CNFs) via a facile coaxial electrospinning followed by a two‐step annealing process. TiO2 shells and MoO3 cores were coaxially integrated into the porous CNFs (denote the composite as TiO2 /MoO3 @CNFs). The two‐step annealing strategy (carbonization in Ar and then oxidization in air) allows the readily encapsulation of MoO3 into CNFs. When applied as anode materials for LIBs, the coaxial TiO2 /MoO3 @CNFs demonstrate superior lithium storage performance, delivering a high reversible capacity of 561 mAh/g after 300 cycles at 1000 mA/g with a much higher capacity retention of 70.8% than that of the MoO3 @CNFs without TiO2 layers (only 42.3%). The results clearly demonstrate that the CNFs matrices and the TiO2 shells together efficiently enhance the electrode conductivity and buffer the volume changes of MoO3 upon cycling. Abstract : Coaxial encapsulation of TiO2 shells and MoO3 cores into porous carbon nanofibers (CNFs) is realized via a facile electrospinning followed by a two‐step annealing process, and the as‐prepared TiO2 /MoO3 @CNFs demonstrate superior lithium storage performance when applied as anode materials for LIBs, as the CNFs matrices and the TiO2 shells together efficiently enhance the electrode conductivity and buffer the volume changes of MoO3 upon cycling.