Here we propose an effective strategy to stabilize small sulfur species by using aminomethyl-functionalized carbon nanotubes (AM-CNT) without impairing the conductive channel of the carbon nanotube (CNT) cathode. The linear Sn clusters can be anchored strongly to the AM-CNT for the favorable size of n=5 and the maximum size of n=6 in the production of the cathode, which depresses the mass loss of active sulfur effectively and eliminates the formation of high-order polysulfides completely during the discharge process. The most stable 3 D cross-linked Inter-S5 -AM-CNT network shows a fast electron transfer redox reaction through the CNT skeleton that possesses a theoretical capacity of 1337 mA h g-1 (based on sulfur) or 592 mA h g-1 (based on the cathode). The discharge products of the linear S5 cluster tend to form a hyperbranched tight structure through N⋅⋅⋅S⋅⋅⋅Li bridges that are fully impregnated in the AM-CNT bundles, and thus stabilize the entire system. Importantly, this study provides vital guidance into how to design cathodes based on small sulfur clusters for Li-S batteries to depress the shuttle effect intrinsically during charge-discharge cycles, which can be extended to the other small-sulfur-cluster-based batteries.

中文翻译：

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氨甲基功能化碳纳米管作为高性能锂硫电池小型硫簇的主体。

在这里，我们提出了一种有效的策略，通过使用氨基甲基官能化的碳纳米管（AM-CNT）来稳定少量的硫，而不会损害碳纳米管（CNT）阴极的导电通道。线性Sn团簇可以牢固地锚固在AM-CNT上，从而在阴极生产中具有n = 5的有利尺寸和n = 6的最大尺寸，从而有效地抑制了活性硫的质量损失并消除了在放电过程中完全清除了高阶多硫化物。最稳定的3D交联Inter-S5-AM-CNT网络显示出通过CNT骨架的快速电子转移氧化还原反应，其理论容量为1337 mA h g-1（基于硫）或592 mA h g- 1（基于阴极）。线性S5簇的放电产物倾向于通过完全浸入AM-CNT束中的N····S·····Li桥形成超支化的紧密结构，从而稳定整个系统。重要的是，这项研究为如何为Li-S电池设计基于小型硫簇的阴极提供了至关重要的指导，以在充放电循环中固有地抑制穿梭效应，该效应可以扩展到其他基于小型硫簇的电池。