Zhou Yongsheng, Zhu Yingchun, Xu Bingshe, Zhang Xueji, Al-Ghanim Khalid A, Mahboob Shahid
College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu, 233030, People's Republic of China.
Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People's Republic of China.
Nanomicro Lett. 2019 Mar 29;11(1):29. doi: 10.1007/s40820-019-0259-z.
Lithium-ion batteries (LIBs) are considered new generation of large-scale energy-storage devices. However, LIBs suffer from a lack of desirable anode materials with excellent specific capacity and cycling stability. In this work, we design a novel hierarchical structure constructed by encapsulating cobalt sulfide nanowires within nitrogen-doped porous branched carbon nanotubes (NBNTs) for LIBs. The unique hierarchical CoS@NBNT electrode displayed a reversible specific capacity of 1310 mAh g at a current density of 0.1 A g, and was able to maintain a stable reversible discharge capacity of 1109 mAh g at a current density of 0.5 A g with coulombic efficiency reaching almost 100% for 200 cycles. The excellent rate and cycling capabilities can be ascribed to the hierarchical porosity of the one-dimensional CoS@NBNT internetworks, the incorporation of nitrogen doping, and the carbon nanotube confinement of the active cobalt sulfide nanowires offering a proximate electron pathway for the isolated nanoparticles and shielding of the cobalt sulfide nanowires from pulverization over long cycling periods.
锂离子电池（LIBs）被认为是新一代大规模储能装置。然而，锂离子电池缺乏具有优异比容量和循环稳定性的理想阳极材料。在这项工作中，我们设计了一种新型的分级结构，通过将硫化钴纳米线封装在氮掺杂的多孔分支碳纳米管（NBNTs）中来用于锂离子电池。独特的分级CoS@NBNT电极在电流密度为0.1 A g时显示出1310 mAh g的可逆比容量，并且在电流密度为0.5 A g时能够保持1109 mAh g的稳定可逆放电容量，在200次循环中库仑效率几乎达到100%。优异的倍率性能和循环性能可归因于一维CoS@NBNT网络的分级孔隙率、氮掺杂的引入以及活性硫化钴纳米线的碳纳米管限制，为孤立的纳米颗粒提供了近程电子通路，并在长时间循环过程中保护硫化钴纳米线不被粉碎。
