Hong-kun Zhuang, Wen-cui Li, Bin He, Jia-he Lv, Jing-song Wang, Ming-yuan Shen, An-hui Lu
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引用次数: 0
摘要
石油焦(PC)含碳量高且成本低廉,是钠离子电池(SIB)阳极的重要前驱体。调节易石墨化 PC 基碳的微晶状态和孔隙结构对于创造丰富的 Na+ 储存位点至关重要。在此,我们采用了一种前驱体转化策略来增加碳层间间距,并在 PC 基碳中产生大量封闭孔隙,从而显著提高其在高原区的 Na+ 储存能力。这是通过混合酸处理引入大量氧官能团,然后利用高温碳化分解氧官能团并重新排列碳微晶,从而实现从开放孔隙到封闭孔隙的转变。优化后的样品在 0.02 A g-1 的电压下具有 356.0 mAh g-1 的大可逆容量,其中约 93% 的容量低于 1.0 V。电位静态间歇滴定(GITT)和原位 X 射线衍射(XRD)分析表明,低电压高原区的钠存储容量涉及层间插入和闭孔填充过程的共同作用。本研究提出了一种利用低成本高芳香族前驱体开发高性能碳阳极的综合方法。
Increasing the interlayer spacing and generating closed pores to produce petroleum coke-based carbon materials for sodium ion storage
Petroleum coke (PC) is a valuable precursor for sodium-ion battery (SIB) anodes due to its high carbon content and low cost. The regulation of the microcrystalline state and pore structure of the easily-graphitized PC-based carbon is crucial for creating abundant Na+ storage sites. Here we used a precursor transformation strategy to increase the carbon interlayer spacing and generate abundant closed pores in PC-based carbon, significantly increasing its Na+ storage capacity in the plateau region. This was achieved by introducing a large number of oxygen functional groups through mixed acid treatment and then using high-temperature carbonization to decompose the oxygen functional groups and rearrange the carbon microcrystallites, resulting in a transition from open to closed pores. The optimized samples provide a large reversible capacity of 356.0 mAh g−1 at 0.02 A g−1, of which approximately 93% is below 1.0 V. Galvanostatic intermittent titration (GITT) and in-situ X-ray diffraction (XRD) analysis indicate that the sodium storage capacity in the low voltage plateau region involves a joint contribution of interlayer insertion and closed pore filling processes. This study presents a comprehensive method for the development of high-performance carbon anodes using low-cost and highly aromatic precursors.
期刊介绍:
New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.