Dodecahedral ZnO/C framework on reduced graphene oxide sheets for high-performance Li-ion battery anodes
- Authors
- Samuel, Edmund; Park, Chanwoo; Kim, Taegun; Joshi, Bhavana; Aldalbahi, Ali; Alanzi, Hamdah S.; Swihart, Mark T.; Yoon, Woo Young; Yoon, Sam S.
- Issue Date
- 5-9월-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- ZIF8; Rhombic dodecahedron; Lithium-ion battery; Anode
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.834
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 834
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/53185
- DOI
- 10.1016/j.jallcom.2020.155208
- ISSN
- 0925-8388
- Abstract
- To prepare high-performance ZnO/C nanocomposite anode materials, dodecahedral ZIF-8 was first deposited on exfoliated reduced graphene oxide (rGO) by precipitation from methanol. The ZIF-8 was carbonized by annealing in argon to produce ZnO/C that retained the structure of the ZIF-8 template. ZIF-8-derived ZnO/C and ZnO/C/rGO were deposited over Cu substrates using low-cost, scalable supersonic cold spraying to facilitate the rapid production of Li-ion battery anodes. The synergy of the ZIF-8-derived dodecahedral nanoZnO/C framework with rGO significantly enhanced conductivity, reduced aggregation, and shortened Li-ion transfer pathways. Electrochemical impedance spectroscopy showed enhanced Li-ion diffusion. The rGO/ZnO/C framework demonstrated a specific capacity of 1325 mAh.g(-1) at a specific current of 100 mAh.g(-1). At a higher current of 2.5 A.g(-1), the anode delivered a capacity of 525 mAh.g(-1). The composite also showed a highly stable reversible capacity of 1063 mAh.g(-1) after 300 cycles. The outstanding electrochemical performance of the rGO/ZnO/C sample was facilitated by the three-dimensional morphology of the exfoliated rGO and ZIF-8-derived dodecahedral porous ZnO/C structure. A quantitative comparison of specific capacity and capacity retention shows that the electrochemical performance of these rGO/ZnO/C composites exceeds that of previously-reported anodes based on ZnO, carbon, and/or rGO. (C) 2020 Elsevier B.V. All rights reserved.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
- College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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