Improved the cycling stability of SiO۲ as an effective electrode using a SiO۲/metal-organic frameworks composite for next-generation lithium-ion batteries

In the current study, to address the challenges of silica (SiO۲) anode material for use in large-scale energy storage lithium, an effective strategy has been introduced based on using silica nanoparticles/ zeolitic imidazolate frameworks-۶۷ /mesoporous silica layer as a precursor (denoted as SiO۲/ZIF-۶۷/ SiO۲). This novel approach was applied to attain a composite electrode constructed of double-morphology SiO۲, Co-based nanoparticles enwrapped in nitrogen-doped graphene-like structure, and carbon nanotubes (SiO۲@CoN/NG/CNTs@SiO۲). The designed composite silica- based electrode (DCSiE) discloses prolonged cyclic stability upon ۳۰۰۰ cycles with a high reversible capacity of ~ ۵۵۶.۹۵ mAh g−۱ at a high rate ۵.۰ A g−۱ in a Li//DCSiE half-cell (Figure ۱a). Immediately after the charge speed and stability test, the performance of the Li//DCSiE half- cell at different current densities ranging from ۵ to ۰.۱ A g-۱ was also investigated. Figure ۱b highlights average specific discharge capacities of ۲۹۵, ۳۲۶, ۳۷۰, ۴۵۵, ۶۱۸, ۷۶۷, ۹۹۴ and ۱۱۶۲mAh g-۱ were delivered at the current densities of ۵.۰, ۴.۰, ۳.۰, ۲.۰, ۱.۰, ۰.۵, ۰.۲ and ۰.۱ A g-۱, respectively. When the current density is returned to ۰.۵ A g-۱, a high discharge capacity of ۵۸۵ mAh g-۱ can be recovered, which retains ۶۰% of the capacity. Similarly, Figure ۱c shows excellent reversibility. Hence, it seems quite clear that the designed composite silica-based electrode (DCSiE) is sought after to ensure achieving the high electrochemical performance of silica-based anodes. Undoubtedly, this research opens up a new avenue for synthesizing silica/carbon composite derived from metal-organic frameworks (MOF) architecture and provides an idea, a cheap candidate, for noble silica-based anodes in emerging battery technologies [۱,۲].

کلیدواژه ها:

Anode material ، SiO۲/C composite ، Metal-organic frameworks ، ZIF-۶۷ ، Lithium-ion batteries ،