提高从生物质中提取的低成本硬碳的储存性能

IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Carbon Trends Pub Date : 2024-10-19 DOI:10.1016/j.cartre.2024.100415
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引用次数: 0

摘要

硬碳是目前钠离子电池最广泛使用的负极材料。实现高存储容量和提高高原容量(而不是斜坡容量)对于提高全电池的能量密度至关重要。虽然有多篇论文论述了硬碳的合成,但商业放大的经济可行性取决于前驱体的选择。在本研究中,我们报告了从甘蔗渣和玉米渣这两种生物质前驱体中提取的硬质碳的电化学特性,并将它们的性能与市售硬质碳进行了比较。从甘蔗渣中提取的硬质碳在 C/10 放电速率下的容量为 307 mAh/g,在 3C 放电速率下的容量约为 234 mAh/g。我们整合了表面积、孔径分布、拉曼光谱、小角 X 射线和中子散射数据,以阐明这些硬碳样品中的钠存储机制。我们对具有六方有序性的相关石墨畴以及纳米片的分形聚集进行了量化。甘蔗渣衍生硬碳的高原容量归因于纳米片的特征形态和尺寸分布及其聚结性质。
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Enhanced storage performance of a low-cost hard carbon derived from biomass
Hard Carbon is the most widely used negative electrode material for sodium-ion batteries today. Achieving high storage capacity and increasing the plateau capacity, as opposed to the sloping profile, are crucial for enhancing energy density of the full cells. While several publications address the synthesis of hard carbon, the economic viability for commercial scale-up hinges on the choice of precursors. In this study, we report the electrochemical properties of hard carbon derived from two biomass precursors, sugarcane waste (bagasse) and corn waste, and compare their performances with commercially available hard carbon. The hard carbon derived from bagasse delivers a capacity of 307 mAh/g at C/10 rate and retains approximately 234 mAh/g at 3C discharge rate. We integrate surface area, pore size distribution, Raman spectroscopy, small-angle X-ray and neutron scattering data to elucidate the sodium storage mechanism in these hard carbon samples. Correlated graphitic domains with hexagonal ordering along with fractal like agglomeration of the nanosheets are quantified. The high plateau capacity of the bagasse-derived hard carbon is attributed to the characteristic morphology and size distribution of the nanosheets and their nature of agglomeration.
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来源期刊
Carbon Trends
Carbon Trends Materials Science-Materials Science (miscellaneous)
CiteScore
4.60
自引率
0.00%
发文量
88
审稿时长
77 days
期刊最新文献
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