Journal article
Encapsulation of redox polysulphides via chemical interaction with nitrogen atoms in the organic linkers of metal-organic framework nanocrystals
Scientific reports, Vol.6(1), pp.25555-25555
05/05/2016
Handle:
https://hdl.handle.net/2376/107556
PMCID: PMC4857742
PMID: 27149405
Abstract
Lithium polysulphides generated during discharge in the cathode of a lithium-sulphur redox cell are important, but their dissolution into the electrolyte from the cathode during each redox cycle leads to a shortened cycle life. Herein, we use in situ spectroelectrochemical measurements to demonstrate that sp(2) nitrogen atoms in the organic linkers of nanocrystalline metal-organic framework-867 (nMOF-867) are able to encapsulate lithium polysulphides inside the microcages of nMOF-867, thus helping to prevent their dissolution into the electrolyte during discharge/charge cycles. This encapsulation mechanism of lithiated/delithiated polysulphides was further confirmed by observations of shifted FTIR spectra for the C = N and C-N bonds, the XPS spectra for the Li-N bonds from nMOF-867, and a visualization method, demonstrating that nMOF-867 prevents lithium polysulphides from being dissolved in the electrolyte. Indeed, a cathode fabricated using nMOF-867 exhibited excellent capacity retention over a long cycle life of 500 discharge/charge cycles, with a capacity loss of approximately 0.027% per cycle from a discharge capacity of 788 mAh/g at a high current rate of 835 mA/g.
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Details
- Title
- Encapsulation of redox polysulphides via chemical interaction with nitrogen atoms in the organic linkers of metal-organic framework nanocrystals
- Creators
- Jung Hyo Park - Department of Materials Science and Engineering, Advanced Institute of Science and Technology Korea 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaKyung Min Choi - Department of Chemical and Biological Engineering, Sookmyung Women's University Cheonpa-ro 47-gil 100, Yongsan-gu, Seoul 04310, Republic of KoreaDong Ki Lee - Department of Materials Science and Engineering, Advanced Institute of Science and Technology Korea 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaByeong Cheul Moon - Graduate School of EEWS (Energy, Environment, Water, and Sustainability) Korea Advanced Institute of Science and Technology 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaSang Rim Shin - Department of Materials Science and Engineering, Advanced Institute of Science and Technology Korea 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaMin-Kyu Song - School of Mechanical and Materials Engineering, Washington State University Pullman, Washington 99164-2920, USAJeung Ku Kang - Graduate School of EEWS (Energy, Environment, Water, and Sustainability) Korea Advanced Institute of Science and Technology 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
- Publication Details
- Scientific reports, Vol.6(1), pp.25555-25555
- Publisher
- England
- Identifiers
- 99900546888201842
- Language
- English
- Resource Type
- Journal article