Self-Templated Formation of Interlaced Carbon Nanotubes Threaded Hollow Co3S4 Nanoboxes for High-Rate and Heat-Resistant Lithium-Sulfur Batteries
Self-Templated Formation of Interlaced Carbon Nanotubes Threaded Hollow Co3S4 Nanoboxes for High-Rate and Heat-Resistant Lithium-Sulfur Batteries
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用于高倍率耐热锂硫电池的交错碳纳米管螺纹空心Co3S4纳米盒的自模板形成
DOI：
10.1021/jacs.7b06973
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发表时间：
2017-09-13
影响因子：
15
通讯作者：
Jin, Zhong
中科院分区：
文献类型：
--
作者：
Chen, Tao;Zhang, Zewen;Jin, Zhong
锂硫电池（Li-S）由于其特别高的能量密度而引起了人们的极大关注。然而，锂硫电池的实际应用仍面临多重挑战，包括中间多硫化物的穿梭效应，硫的低电导率和硫阴极的大体积变化。为了克服这些问题，在这里，我们报道了一种自模板的方法来制备互连的碳纳米管插入/有线空心Co 3S 4纳米盒（CNT/Co 3S 4-NBs）作为一种有效的硫主体材料。碳纳米管/Co 3S 4-NBs杂化纳米复合材料是由碳纳米管三维导电网络和极性Co 3S 4-NBs复合而成，具有良好的电荷转移性能，并通过结构约束和化学键合的协同作用有效抑制了中空Co 3S 4-NBs中的多硫化物。受益于上述优点，S@ CNT/Co 3S 4-NBs阴极在高可逆容量、良好倍率性能和长期循环性方面显示出显著改善的电化学性能。更值得注意的是，即使在高温（50 ℃）下，它仍然表现出高容量保持率和良好的倍率容量。
Lithium-sulfur batteries (Li-S) have attracted soaring attention due to the particularly high energy density for advanced energy storage system. However, the practical application of Li-S batteries still faces multiple challenges, including the shuttle effect of intermediate polysulfides, the low conductivity of sulfur and the large volume variation of sulfur cathode. To overcome these issues, here we reported a self-templated approach to prepare interconnected carbon nanotubes inserted/wired hollow Co3S4 nanoboxes (CNTs/Co3S4-NBs) as an efficient sulfur host material. Originating from the combination of three-dimensional CNT conductive network and polar Co3S4-NBs, the obtained hybrid nanocomposite of CNTs/Co3S4-NBs can offer ultrahigh charge transfer properties, and efficiently restrain polysulfides in hollow Co3S4-NBs via the synergistic effect of structural confinement and chemical bonding. Benefiting from the above advantages, the S@CNTs/Co3S4-NBs cathode shows a significantly improved electrochemical performance in terms of high reversible capacity, good rate performance, and long-term cyclability. More remarkably, even at an elevated temperature (50 degrees C), it still exhibits high capacity retention and good rate capacity.