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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Green synthesis of porous graphitic carbons from coal tar pitch templated by nano-CaCO3 for high-performance lithium-ion batteries
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Green synthesis of porous graphitic carbons from coal tar pitch templated by nano-CaCO3 for high-performance lithium-ion batteries

机译：纳米Caco3对高性能锂离子电池煤焦油沥青的绿色合成

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摘要

A green and cost-effective strategy was developed to synthesize porous graphitic carbons from coal tar pitch using commercially available CaCO3 nanoparticles as template without any further activation. The prepared porous graphitic carbons have well-developed hierarchical porous structure with moderate specific surface area (similar to 236.3 m(2) g(-1)) and large pore volume (similar to 2.871 cm(3) g(-1)), cross-linked carbon skeleton with relatively high levels of graphitic feature and enriched in oxygen/nitrogen-containing functional groups. Such unique microstructure characteristics of porous graphitic carbons not only can endow sufficient available space or active sites for Li-ions storage, but also can provide favorable and efficient channels for the Li-ions/electrons transportation. The prepared porous graphitic carbon PGC-3 applied as anode for lithium-ion batteries (LIBs) shows a large reversible capacity of 707 mAh g(-1) at 0.05 A g(-1), and presents a superior rate capability with high reversible capacities of 299 mAh g(-1) and 248 mAh g(-1) even at the extremely high current densities of 3 Ag-1 and 5 Ag-1, respectively. Moreover, such porous graphitic carbon also exhibits an outstanding long-term electrochemical stability and excellent cycling performance with over 93.5% capacity retention after 1000 cycles. This study paves a promising and universal way for large-scale production of porous graphitic carbons porous from coal tar pitch for high performance anode materials used in LIBs. (C) 2019 Published by Elsevier B.V.
机译：开发了一种绿色和成本效益的策略，以使用商业上可获得的CaCO 3纳米颗粒作为模板来合成来自煤焦沥青的多孔石墨碳，而没有任何进一步的活化。制备的多孔石墨碳碳具有良好开发的分层多孔结构，具有适度的比表面积（类似于236.3M（2）G（-1））和大的孔体积（类似于2.871cm（3 )g（3）g（-1）），交联碳骨架具有相对高水平的石墨特征，并富含含氧/氮的官能团。多孔石墨碳的这种独特的微观结构特性不仅可以赋予Li-离子储存的足够的可用空间或活性位点，而且还可以为Li-ICE /电子运输提供有利和有效的通道。作为锂离子电池（LIBS）施加的制备的多孔石墨碳PGC-3显示出707mAhg（-1）的较大可逆容量，0.05Ag（-1），并具有高可逆的优异速率能力即使在3Ag-1和5 Ag-1的极高电流密度下，299mAhg（-1）和248mAhg（-1）的容量也分别为3 ag-1和5 ag-1。此外，这种多孔石墨碳也表现出优异的长期电化学稳定性和优异的循环性能，在1000次循环后容量保持超过93.5％。本研究铺平了对来自煤焦油沥青多孔多孔的大型生产的有前途和普遍的方式，用于LIBS中使用的高性能阳极材料。 （c）2019年由elestvier b.v发布。

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