High Initial Reversible Capacity and Long Life of Ternary SnO2-Co-carbon Nanocomposite Anodes for Lithium-Ion Batteries

Abstract

HIGHLIGHTS• SnO 2 -Co-carbon nanocomposites were in-situ prepared from Co-based metal-organic frameworks and showed a remarkably high initial Coulombic efficiency (82.2%) and a capacity of ~ 800 mAh g −1 at a high current density of 5 A g −1 .• Facile approach for designing highly reversible and stable electrodes for next-generation high-performance lithium-ion batteries.ABSTRACT The two major limitations in the application of SnO 2 for lithium-ion battery (LIB) anodes are the large volume variations of SnO 2 during repeated lithiation/delithiation processes and a large irreversible capacity loss during the first cycle, which can lead to a rapid capacity fade and unsatisfactory initial Coulombic efficiency (ICE). To overcome these limitations, we developed composites of ultrafine SnO 2 nanoparticles and in situ formed Co(CoSn) nanocrystals embedded in an N-doped carbon matrix using a Co-based metal-organic framework (ZIF-67). The formed Co additives and structural advantages of the carbon-confined SnO 2 /Co nanocomposite effectively inhibited Sn coarsening in the lithiated SnO 2 and mitigated its structural degradation while facilitating fast electronic transport and facile ionic diffusion. As a result, the electrodes demonstrated high ICE (82.2%), outstanding rate capability (~ 800 mAh g −1 at a high current density of 5 A g −1 ), and long-term cycling stability (~ 760 mAh g −1 after 400 cycles at a current density of 0.5 A g −1 ). This study will be helpful in developing high-performance Si (Sn)-based oxide, Sn/Sb-based sulfide, or selenide electrodes for LIBs. In addition, some metal organic frameworks similar to ZIF-67 can also be used as composite templates.

Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

“…Lithium-ion batteries (LIBs) are widely utilized in the portable electronics owing to their numerous merits, such as high energy density, long lifespan, and environmental friendliness [1][2][3][4]. Nevertheless, to meet the ever-growing demand for longer distance electric vehicles and more advanced electrical devices, the energy density of commercially available LIBs needs to be further enhanced [5][6][7]. Si anode with the highest theoretical specific capacity (4400 mAh g À1 ) presents the most competitive alternative to graphite among all the lithium storage materials [8,9].…”

Highly Stabilized Silicon Nanoparticles for Lithium Storage via Hierarchical Carbon Architecture

“…The Co is the residue from ZIF-67, and its content in the sample is too minor to be determined. The presence of a trace amount of Co is beneficial for accelerating the charge transfer kinetics and improving the rate capability of the sample. , Raman spectroscopy was performed to measure the degree of graphitization of carbon in the prepared samples (Figure b). The peaks appearing at 510, 920, and 297 cm –1 correspond to crystalline silicon and cobalt, respectively .…”

Advance Optical Properties and Emerging Applications of 2D Materials

“…They also offer a wide range of spectrum of operation from UV to near-infrared (NIR). These multi-structures alter the device performances to a great extent (Deng et al, 2019). There also exist studies on 2D metalsemiconductor heterostructure interfaces as 2D metallic materials have a wider range of work functions (Tan J. et al, 2021).…”