Abstract
TiO2 nanotube layers (TNTs) decorated with Al2O3/MoS2/Al2O3 are investigated as a negative electrode for 3D Li-ion microbatteries. Homogenous nanosheets decoration of MoS2, sandwiched between Al2O3 coatings within self-supporting TNTs was carried out using atomic layer deposition (ALD) process. The structure, morphology, and electrochemical performance of the Al2O3/MoS2/Al2O3-decorated TNTs were studied using scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and chronopotentiometry. Al2O3/MoS2/Al2O3-decorated TNTs deliver an areal capacity almost three times higher than that obtained for MoS2-decorated TNTs and as-prepared TNTs after 100 cycles at 1C. Moreover, stable and high discharge capacity (414 µAh cm−2) has been obtained after 200 cycles even at very fast kinetics (3C).
Highlights
Nowadays, microelectrochemical systems are key devices for providing power for micro/nanoelectromechanical devices (M/NEMS) in the fields of bio/medical engineering, aerospace, and intelligent sensors [1,2,3]
We showed, for the first time, TNT layers homogenously decorated with ultrathin MoS2 nanosheets using atomic layer deposition (ALD) process that can be used as anode for 3D μLIBs [6]
The surface chemical state of MoS2 was monitored by X-ray photoelectron spectroscopy (XPS) (ESCA2SR, Scienta-Omicron, Taunusstein, Germany) using a monochromatic Al Kα (1486.7 eV) X-ray source operated with 250W and 12.5kV
Summary
Microelectrochemical systems are key devices for providing power for micro/nanoelectromechanical devices (M/NEMS) in the fields of bio/medical engineering, aerospace, and intelligent sensors [1,2,3]. The development of 3D μLIBs forms a viable alternative to planar 2D μLIBs to overcome the tradeoff between power and energy [13,14] Nanomaterials such as nanopillars, nanorods, nanowires, and nanotubes are widely explored as potential electrode materials for 3D μLIBs due to their short ion diffusion distances, high aspect ratio, and small foot print [15,16,17,18]. Self-supported TiO2 nanotube (TNT) layers have been extensively explored as anodes for 2D/3D μLIBs due to their unique one-dimensional architecture, high self-ordering degree, short Li+ diffusion distance, fast electron transport, safety (high lithiation potential ~1.7 V vs Li/Li+), low self-discharge rate, and nontoxic nature [18,19,20,21,22] Their low theoretical capacity (168 mAh g−1) and poor electronic conductivity pose a major obstacle for practical application [20,23,24]. The 3D multilayers deliver excellent areal capacities with good stability up to 200 cycles even at very fast kinetics, making the Al2O3/MoS2/Al2O3-decorated TNT layers a potential candidate as a negative electrode for high performance μLIBs
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
