Metal-Organic-Framework-Derived N-Doped Hierarchically Porous Carbon Polyhedrons Anchored on Crumpled Graphene Balls as Efficient Selenium Hosts for High-Performance Lithium-Selenium Batteries
- Authors
- Park, Seung-Keun; Park, Jul-Sung; Kang, Yun Chan
- Issue Date
- 16-5월-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- crumpled graphene balls; metal-organic frameworks; spray pyrolysis; lithium-selenium batteries; hierarchically porous materials
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.10, no.19, pp.16531 - 16540
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 10
- Number
- 19
- Start Page
- 16531
- End Page
- 16540
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/75520
- DOI
- 10.1021/acsami.8b03104
- ISSN
- 1944-8244
- Abstract
- Developing carbon scaffolds showing rational pore structures as cathode hosts is essential for achieving superior electrochemical performances of lithium-selenium (Li-Se) batteries. Hierarchically porous N-doped carbon polyhedrons anchored on crumpled graphene balls (NPC/CGBs) are synthesized by carbonizing a zeolitic imidazolate framework-8 (ZIF-8)/CGB composite precursor, producing an unprecedented effective host matrix for high-performance Li-Se batteries. Mesoporous CGBs obtained by one-pot spray pyrolysis are used as a highly conductive matrix for uniform polyhedral ZIF-8 growth. During carbonization, ZIF-8 polyhedrons on mesoporous CGBs are converted into N doped carbon polyhedrons showing abundant micropores, forming a high-surface area, high-pore-volume hierarchically porous NPC/CGB composite whose small unique pores effectively confine Se during melt diffusion, thereby providing conductive electron pathways. Thus, the integrated NPC/CGB-Se composite ensures high Se utilization originating from complete electrochemical reactions between Se and Li ions. The NPC/CGB-Se composite cathode exhibits high discharge capacities (998 and 462 mA h g(-1) at the 1st and 1000th cycles, respectively, at a 0.5 C current density), good capacity retention (68%, calculated from the 3rd cycle), and excellent rate capability. A discharge capacity of 409 mA h g-1 is achieved even at an extremely high (15.0 C) current density.
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