Sulfur-encapsulated in heteroatom-doped hierarchical porous carbon derived from goat hair for high performance lithium-sulfur batteries
Sulfur-encapsulated in heteroatom-doped hierarchical porous carbon derived from goat hair for high performance lithium-sulfur batteries
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DOI：
10.1016/j.jechem.2018.01.015
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发表时间：
2019-03-01
影响因子：
13.1
通讯作者：
Lin, Dunmin
中科院分区：
文献类型：
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作者：
Ren, Juan;Zhou, Yibei;Lin, Dunmin
生物质衍生的碳材料作为硫的主体材料以提高锂硫电池的电化学性能引起了广泛的关注。本文采用山羊毛作为一种低成本且环保的前驱体，通过 H3PO4 的简便活化和碳化过程，原位制备了花椰菜状氮、氧、磷三掺杂多孔生物质碳（NOPC）。 NOPC 的形态和微观结构可以通过改变热解温度轻松调节。所制备的600℃碳化NOPC基体材料具有3D分级多孔结构、高比表面积(535.352 m(2) g(-1))、合适的孔径和孔径分布。将硫封装到NOPC中取决于作为Li-S电池正极材料的茎熔化技术。由于特殊的物理结构和固有的N、O、P三掺杂的协同效应，改善了材料中电子和离子的传输以及活性硫的利用，并且也减轻了可溶性多硫化锂的穿梭行为。因此，S/NOPC-600复合材料表现出优异的电化学性能，在0.05 C下具有1185 mAh g(-1)的高初始放电容量，并在300次循环后在0.2 C下保持相对可观的容量489 mAh g(-1)。我们的工作表明，可以使用低成本和可再生的生物质材料，通过简便的工艺合成一种有前景的锂硫电池正极材料候选材料。 (C) 2018 科学出版社和中国科学院大连化学物理研究所。由 Elsevier B.V. 和科学出版社出版。版权所有。
Biomass-derived carbon materials have aroused widespread concern as host material of sulfur to enhance electrochemical performances for lithium-sulfur batteries. Herein, goat hair, as a low-cost and eco-friendly precursor, is employed to fabricate cauliflower-like in-situ nitrogen, oxygen and phosphorus tri-doped porous biomass carbon (NOPC) by a facile activation with H3PO4 and carbonization process. The morphology and microstructure of NOPC can be readily tuned by altering pyrolysis temperature. The as-prepared NOPC matrix material carbonized at 600 degrees C possesses 3D hierarchical porous structure, high specific surface area (535.352 m(2) g(-1)), and appropriate pore size and pore size distribution. Encapsulating sulfur into the NOPC depends on a stem-melting technology as cathode materials of Li-S batteries. Due to the synergistic effect of special physical structure and inherent tri-doping of N, O and P, electrons and ions transfer and utilization of active sulfur in the materials are improved, and the shuttle behaviors of soluble lithium polysulfides are also mitigated. Consequently, the S/NOPC-600 composite exhibits excellent electrochemical performance, giving a high initial discharge capacity of 1185 mA h g(-1) at 0.05 C and maintaining a relatively considerable capacity of 489 mA h g(-1) at 0.2 C after 300 cycles. Our work shows that a promising candidate for cathode material of Li-S batteries can be synthesized using low-cost and renewable biomass materials by a facile process. (C) 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.