Graphitic carbon-based anodes for lithium-ion batteries have seen remarkable development and commercial acceptance during the past three decades. Still, the performance of these materials is limited due to the low surface area, stacking of layers, poor porosity, and meager conductivity. To overcome these limitations, we propose using polystyrene as a core and small-sized zeolitic imidazolate framework-67 (ZIF-67) particles as decorators to develop a highly porous three-dimensional graphitic carbon material. The developed material is optimized with the carbonization temperature for the best anodic performance of LIBs. The pyridinic nitrogen content in the material carbonized at 700 °C makes it high performing and more stable than the samples treated at 600, 800, and 900 °C. The packed coin cell exhibited an initial discharge capacity of 775 mA h g−1 at a current density of 50 mA g−1, which increases to 806 mA h g−1 after testing the material at different current densities for 55 cycles. The packed half-cell exhibited a highly stable performance of about 96 even after testing for 2000 cycles at 1 A g−1.
展开▼
机译：在过去的三十年中，用于锂离子电池的石墨碳基阳极取得了显着的发展和商业接受度。尽管如此，由于表面积小、层堆积、孔隙率差和导电性差，这些材料的性能仍然受到限制。为了克服这些局限性，我们提出以聚苯乙烯为芯，以小尺寸沸石咪唑酸盐骨架-67（ZIF-67）颗粒为装饰剂，开发一种高度多孔的三维石墨碳材料。所开发的材料根据碳化温度进行了优化，以实现锂离子电池的最佳阳极性能。在700°C下碳化的材料中的吡啶氮含量使其比在600、800和900°C下处理的样品更高性能和更稳定。 在50 mA g−1的电流密度下，填充纽扣电池的初始放电容量为775 mA h g−1，在不同电流密度下测试材料55次循环后，初始放电容量增加到806 mA h g−1。即使在1 A g−1下测试2000次循环后，填充的半电池也表现出约96%的高度稳定性能。
展开▼
