Mesoporous CoSe2 nanoclusters threaded with nitrogen-doped carbon nanotubes for high-performance sodium-ion battery anodes
- Authors
- Yang, Su Hyun; Park, Seung-Keun; Kang, Yun Chan
- Issue Date
- 15-8월-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- CNT (carbon nanotube); Cobalt selenide; Sodium-ion battery; Necklace-like structure; Mesoporous
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.370, pp.1008 - 1018
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 370
- Start Page
- 1008
- End Page
- 1018
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/63508
- DOI
- 10.1016/j.cej.2019.03.263
- ISSN
- 1385-8947
- Abstract
- Currently, a great challenge to the design of durable sodium-ion batteries (SIBS) is the need for the architecture of nanostructured transition metal-selenide electrodes with high capacity and excellent cycling stability. In this paper, we describe a novel metal-organic framework (MOF)-induced approach to construct necklace-like carbon nanotube (CNT)-CoSe2@N-doped carbon (NC) with excellent sodium ion storage performance. In this strategy, CNT-threaded zeolitic imidazolate framework-67 (ZIF-67) polyhedra, synthesized by wet chemical methods, are used as the precursor. During the selenization step, ZIF-67 polyhedra transform into mesoporous nanoclusters consisted of CoSe2@NC nanoparticles, forming CNT-CoSe2@NC composites with a necklace-like morphology. Such structures facilitate ion and electron transport, and inhibit the aggregation and pulverization of active materials during cycling processes via the intimate contact between the CNTs and CoSe2@NC. The as-designed composites show significantly improved electrochemical properties including high discharge capacity (404 mA.h.g(-1) after 120 cycles at 0.2 A.g(-1)), excellent rate performance (363 mA.h.g(-1) at 5.0 A.g(-1)), and reasonable capacity retention (80% when calculated from the 2nd cycle).
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