CoS2 nanodots trapped within graphitic structured N-doped carbon spheres with efficient performances for lithium storage. Issue 16 (6th April 2018)

• Record Type: Journal Article
• Authors: Xia, Huicong; Li, Kexie; Guo, Yingying; Guo, Junhui; Xu, Qun; Zhang, Jianan
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 16(2018)
• Page Start: 7148
• Page End: 7154
• Publication Date: 2018-04-06
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta00689j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : CoS2 nanodots embedded in the graphitic carbon wall of the NCSs with nest-like architecture and numerous nanocages, which results in high efficient performances for lithium storage. Abstract : Cobalt sulfide (CoS2 )-based nanomaterials are promising electrode materials for various energy storage and conversion applications due to their large specific capacities and catalytic activities. However, CoS2 -based nanomaterials are still suffering from their volume expansion, agglomeration and poor cycling stability. Here, we demonstrated an intriguing and effective strategy to confine CoS2 nanodots (<10 nm) within the graphitic carbon walls of porous N-doped carbon spheres (CoS2 -in-wall-NCSs), which both avoids the volume change and facilitates the promotion of reaction kinetics in lithium ion batteries (LIBs). Moreover, N-doped carbon spheres (NCSs) with nest-like architectures and graphitic carbon nanoribbons offer an ideal diffusion pathway for electrolyte ions and a highly rapid electron transfer pathway. As a result, the CoS2 -in-wall-NCSs still exhibit an excellent performance in LIBs with a high specific capacity of 1080.6 mA h g −1 at a current density of 200 mA g −1 even after 500 cycles, which is much better than those of CoS2 nanoparticles (NPs) in the pores of N-doped carbon spheres (CoS2 -in-pore-NCSs), metallic Co NPs embedded in N-doped carbon spheres (Co/NCSs), and NCSs. Even at a current density as high as 1000 mA g −1, a reversible capacity of 735.5 mA h g −1 is obtained for CoS2 -in-wall-NCSs.