Alkaline lignin derived porous carbon as an efficient scaffold for lithium-selenium battery cathode
Alkaline lignin derived porous carbon as an efficient scaffold for lithium-selenium battery cathode
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DOI：
10.1016/j.carbon.2017.07.004
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发表时间：
2017-10
期刊：
影响因子：
10.9
通讯作者：
He Zhang;Dandan Jia;Zewen Yang;Faqi Yu;Yunlan Su;Dujing Wang;Q. Shen
中科院分区：
文献类型：
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作者：
He Zhang;Dandan Jia;Zewen Yang;Faqi Yu;Yunlan Su;Dujing Wang;Q. Shen
木质素是一种富含含氧基团的天然芳香族高分子材料，可作为可持续发展的前驱体，用于开发多孔碳质骨架材料，以包裹硒元素。本文采用工业碱木质素的初始组合碳化/活化和随后的硒负载来制备木质素衍生的多孔碳（LPC）和元素硒（即，系列Se/LPC复合材料）用于高性能锂硒（Li-Se）电池。LPC支架的高比表面积、大孔体积和良好的电子传导性促进了硒对金属锂的可逆电化学反应，在0.5 C下，Se/LPC复合电极在第2次循环中表现出596.4 mAh g-1的可逆容量，在300次循环中的容量保持率为453.1 mAh g-1，平均每次循环衰减0.08%。LPC支架的容易获得的微孔特征，以及相应的Se/LPC复合材料的高速率性能（例如，363.2 mAh g-1，4 C），表明生物质原料的大规模处理可能在可再生绿色能源中找到其潜在的应用。
As one of the most abundant natural aromatic polymers with plentiful oxygen-containing groups in molecular backbones, commercial lignin can be regarded as a sustainable precursor to develop porous carbonaceous frameworks for the encapsulation of elemental selenium. In this paper, an initial combined carbonization/activation of commercial alkaline lignin and subsequent selenium-loading are adopted to fabricate serial composites of lignin-derived porous carbon (LPC) and elemental selenium (i.e., serial Se/LPC composites) for high-performance lithium-selenium (Li-Se) batteries. The high specific surface area, large pore volume and good electron conductivity of each LPC scaffold facilitate the reversible electrochemical reaction of selenium towards metallic Li, and at 0.5 C a Se/LPC composite electrode exhibits a reversible capacity of 596.4 mAh g−1in the 2nd cycle and a capacity retention of 453.1 mAh g−1over 300 cycles with an average decay of 0.08% per cycle. The facilely obtained microporous features of LPC scaffold, as well as the high-rate performance of corresponding Se/LPC composites (e.g., 363.2 mAh g−1, 4 C), indicate that large-scale treatment of the biomass feedstock may find its potential application in renewable green energy sources.