期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 16, 页码 7148-7154出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta00689j
关键词
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资金
- National Natural Science Foundation of China [21571157, U1604123, 51173170]
- Outstanding Young Talent Research Fund of Zhengzhou University [1521320001]
- Young Outstanding Teachers of University in Henan Province [2016-130]
- Open Project Foundation of Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) [2017-29]
- Nankai University
- DOpen Project Foundation of State Key Laboratory of Inorganic Synthesis and Preparation of Jilin University
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.
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