Abstract The commercialization of lithium-sulfur (Li–S) battery is largely obstructed by the slow redox kinetics of sulfur cathode and the shuttle effect of polysulfides during its operation, which negatively affect the battery rate capability and cycle life. Herein, a porous CNTs/Co microsphere is synthesized and applied as sulfur host material to boost the electrochemical performance of sulfur cathode. The porous conductive CNTs spherical network can realize a rapid charge and mass transfer via fast conduction of Li+-ions and mitigate the cathode volume expansion in the course of the cycles. Importantly, the Co metal nanoparticles can attain intense chemical adsorption and fast catalytic conversion of polysulfides. Because of the above merits, the high initial discharge specific capacity 1242.5 mAh g−1 was obtained for S-CNTs/Co composite at 0.2C. The capacity decay rate was only 0.066% per cycle at 1C over 300 cycles and the excellent rate performance at up to 3C could also be obtained. Moreover, the S-CNTs/Co composite delivered a high initial areal capacity of 5.7 mAh cm−2 at a high sulfur loading (5.9 mg cm−2), indicating broad perspectives of CNTs/Co as a sulfur host in lithium-sulfur battery.

中文翻译：

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用强催化剂钴纳米粒子装饰的多孔碳纳米管微球作为锂硫电池的有效硫主体

摘要 锂硫（Li-S）电池的商业化在很大程度上受到硫正极缓慢的氧化还原动力学和多硫化物在其运行过程中的穿梭效应的阻碍，这对电池的倍率能力和循环寿命产生了负面影响。在此，合成了多孔 CNTs/Co 微球并将其用作硫主体材料以提高硫正极的电化学性能。多孔导电碳纳米管球形网络可以通过锂离子的快速传导实现快速电荷和质量转移，并减轻循环过程中的阴极体积膨胀。重要的是，Co金属纳米粒子可以实现多硫化物的强烈化学吸附和快速催化转化。由于上述优点，S-CNTs/Co 复合材料在 0 时获得了 1242.5 mAh g-1 的高初始放电比容量。2C。1C 300 次循环的容量衰减率仅为0.066%，并且在高达3C 时也能获得优异的倍率性能。此外，S-CNTs/Co 复合材料在高硫负载（5.9 mg cm-2）下提供了 5.7 mAh cm-2 的高初始面积容量，表明 CNTs/Co 作为锂硫电池中的硫主体具有广阔的前景.