بهبود پایداری چرخه پذیری سیلیکا به عنوان یک الکترود مؤثر با استفاده از کامپوزیت سیلیکا/چارچوب های فلز-آلی برای باتری های لیتیم-یون نسل آینده

کد مقاله : 1175-17THECSI

نویسندگان

محمد مسلمی ورکی، سهیلا جوادیان فرزانه * دانشگاه تربیت مدرس

چکیده مقاله

In the current study, to address the challenges of silica (SiO2) anode material for use in large-scale energy storage lithium, an effective strategy has been introduced based on using silica nanoparticles/ zeolitic imidazolate frameworks-67 /mesoporous silica layer as a precursor (denoted as SiO2/ZIF-67/ SiO2). This novel approach was applied to attain a composite electrode constructed of double-morphology SiO2, Co-based nanoparticles enwrapped in nitrogen-doped graphene-like structure, and carbon nanotubes (SiO2@CoN/NG/CNTs@SiO2). The designed composite silica-based electrode (DCSiE) discloses prolonged cyclic stability upon 3000 cycles with a high reversible capacity of ~ 556.95 mAh g−1 at a high rate 5.0 A g−1 in a Li//DCSiE half-cell (Figure 1a). Immediately after the charge speed and stability test, the performance of the Li//DCSiE half-cell at different current densities ranging from 5 to 0.1 A g-1 was also investigated. Figure 1b highlights average specific discharge capacities of 295, 326, 370, 455, 618, 767, 994 and 1162 mAh g-1 were delivered at the current densities of 5.0, 4.0, 3.0, 2.0, 1.0, 0.5, 0.2 and 0.1 A g-1, respectively. When the current density is returned to 0.5 A g-1, a high discharge capacity of 585 mAh g-1 can be recovered, which retains 60% of the capacity. Similarly, Figure 1c 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.

کلیدواژه ها

Improved the cycling stability of SiO2 as an effective electrode using a SiO2/metal-organic frameworks composite for next-generation lithium-ion batteries

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