Core-shell polyhedrons of carbon nanotubes-grafted graphitic carbon@nitrogen doped carbon as efficient sulfur immobilizers for lithium-sulfur batteries
Core-shell polyhedrons of carbon nanotubes-grafted graphitic carbon@nitrogen doped carbon as efficient sulfur immobilizers for lithium-sulfur batteries
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碳纳米管接枝石墨碳@氮掺杂碳的核壳多面体作为锂硫电池的高效硫固定剂
DOI：
10.1016/j.apsusc.2018.04.123
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发表时间：
2018-08
影响因子：
6.7
通讯作者：
Li Yongsheng
中科院分区：
文献类型：
--
作者：
Yu Haining;Zhang Bo;Sun Fugen;Jiang Guangyu;Zheng Nan;Xu Chuanpeng;Li Yongsheng
在这里，我们报道了一种新型的Li-S电池硫宿主，一种多功能核-壳碳多面体（CNT-GC@NC）复合材料，以石墨碳（GC）为核心，氮掺杂碳（NC）为外壳，外部接枝碳纳米管（CNTs），通过对ZIF-67@ZIF-8核-壳多面体进行热处理即可获得。独特的CNT-GC@NC结合了ZIF-67和ZIF-8衍生的碳的优点，具有分层介孔/微孔结构，高Co纳米粒子和N杂原子含量以及石墨结构的特点。验证了将CNTs接枝到碳多面体的外表面可以形成与内部高石墨化碳相互连接的导电网络。包埋的Co纳米颗粒和掺杂的氮可以协同促进硫的吸附，从而促进多硫化物的氧化还原反应动力学。另一方面，氮掺杂和微孔富集的NC壳作为一个物理屏障，将多硫化物完全包裹在碳宿主体内。由于这些优点，CNT-GC@NC/S具有优异的倍率性能和循环稳定性，在1 ℃下，第200次和第800次循环时，分别具有700和580 mAh g−1的高可逆容量。
Here we report a novel sulfur host for Li-S batteries, a multi-functionalized core–shell carbon polyhedron (CNT-GC@NC) composite, containing graphitic carbon (GC) as the core and nitrogen-doped carbon (NC) as the shell, grafted with carbon nanotubes (CNTs) outside, which is facilely obtained through thermal treating the ZIF-67@ZIF-8 core–shell polyhedron. The unique CNT-GC@NC integrates the advantages of carbons derived from both ZIF-67 and ZIF-8 with features of hierarchically meso/microporous structure, high Co nanoparticle and N heteroatom contents and graphitic structures. It is verified that the grafting of CNTs onto the outer surface of carbon polyhedrons can form interconnected conductive networks with the highly graphitic carbon within. The embedded Co nanoparticles and doped nitrogen can synergistically promote the adsorption of sulfur species and thus the redox reaction kinetics of polysulfides. On the other hand, the nitrogen-doped and micropores-enriched NC shell acts as a physical barrier to totally enclose polysulfides within the carbon hosts. Thanks to these advantages, the CNT-GC@NC/S presents excellent rate performance and cycling stability with the high reversible capacities of 700 and 580 mAh g−1at 200th and 800th cycle at 1 C, respectively.
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影响因子：
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