title: ALD TiO2-Coated Flower-like MoS2Nanosheets on Carbon Cloth as Sodium Ion Battery Anode with Enhanced Cycling Stability and Rate Capability.
abstract: We report the fabrication of 3D flower-like MoS2nanosheets arrays on carbon cloth as a binder-free anode for sodium ion battery. Ultrathin and conformal TiO2layers are used to modify the surface of MoS2by atomic layer deposition. The electrochemical performance measurements demonstrate that the ALD TiO2layer can improve the cycling stability and rate capability of MoS2. The MoS2nanosheets with 0.5-nm TiO2coating electrode show the highest initial discharge capacity of 1392 mA h g-1at 200 mA g-1, which is increased by 53% compared with that of bare MoS2. After 150 cycles, the capacity retention rate of the TiO2-coated MoS2achieves 75.8% of its second cycle's capacity at 200 mA h g-1in contrast to that of 59% of pure MoS2. Furthermore, the mechanism behind the experimental results is revealed by ex situ scanning electron microscope (SEM), X-ray powder diffraction (XRD), and electrochemical impedance spectroscopy (EIS) characterizations, which confirms that the ultrathin TiO2modifications can prevent the structural degradation and the formation of SEI film of MoS2electrode.
authors.affiliation: Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University , Shanghai 200092, P.R. China.
authors.forename: Weina
authors.initials: W
authors.lastname: Ren
authors.affiliation: School of Materials Science and Engineering, Harbin Institue of Technology at Weihai , Weihai, 264209, P. R. China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University , Shanghai 200092, P.R. China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University , Shanghai 200092, P.R. China.
authors.forename: Chuanwei
authors.identifier: http://orcid.org/0000-0002-0735-3648
authors.initials: C
authors.lastname: Cheng
keywords: TiO2; anode; atomic layer deposition; flower-like MoS2 nanosheets; sodium ion battery