Fe-Nx Sites enriched microporous carbon nanoflower planted with tangled bamboo-like carbon nanotube as a strong polysulfides anchor for lithium– sulfur batteries
Fe-Nx Sites enriched microporous carbon nanoflower planted with tangled bamboo-like carbon nanotube as a strong polysulfides anchor for lithium– sulfur batteries
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Fe-Nx Sites 富集微孔碳纳米花，其中种植有缠结的竹状碳纳米管，作为锂硫电池的强力多硫化物锚
DOI：
10.1016/j.gee.2020.06.004
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发表时间：
2021
影响因子：
13.3
通讯作者：
Wang Bao
中科院分区：
文献类型：
--
作者：
Li Hongtai;Chen Yanxiao;Jin Quan;Xiang Wei;Zhong Benhe;Guo Xiaodong;Wang Bao
锂多硫化物（LIPS）的严重班车效果和缓慢的转化动力学对阻碍锂硫的实际应用（LI-S）电池有很大的影响。像碳纳米管（FE-NX-C/FE_3C-CNTS NFS）一样，发现有效的催化介质具有很强的lips锚固能力FE_3C/Fe催化的竹子纳米管互相纠缠以形成一个导电网络，该网络将带有嵌入式良好分散的Fe-NX活性位点包含一个花状的微孔碳芯。碳网络虽然由微孔组成的花样碳芯诱导微小硫的均匀分布，并有利于锂离子迁移同时。在3 C下的特定容量（635 mAh gs〜（-1）），即使在1 C下400个循环后，每个周期的容量衰减，每个周期的衰减均为0.04％。
Serious shuttle effect and sluggish conversion kinetics of lithium polysulfides (LiPSs) have a massive impact on obstructing the practical application of lithium-sulfur (Li–S) batteries. To address such issues, Fe-Nx sites enriched microporous nanoflowers planted with tangled bamboo-like carbon nanotubes (Fe-Nx-C/Fe_3C-CNTs NFs) are found to be effective catalytic mediators with strong anchoring capabilities for LiPSs. The bamboo-like carbon nanotubes catalyzed by Fe_3C/Fe entangled each other to form a conductive network, which encloses a flowerlike microporous carbon core with embedded well-dispersed Fe-Nx active sites. As expected, electrons smoothly transfer along the dense conductive bamboo-like carbon network while the flower-like carbon core consisting of micropores induces the homogeneous distribution of tiny sulfur and favors the lithium ions migration with all directions. Meanwhile, Fe-Nx sites strongly trap long-chain LiPSs with chemical anchoring, and catalyze the redox conversion of LiPSs. Due to the aforementioned synergistic effects, the S@Fe-Nx-C/Fe_3C-CNTs NFs cathode exhibited a remarkable specific capacity (635 mAh gs~(-1)) at 3 C and a favorable capacity decay with 0.04% per cycle even after 400 cycles at 1 C.