Abstract
Maximizing the fixing ability of polyselenides to reduce the shuttle effect in Li-Se batteries remains highly challenging. Single crystal metal-organic framework (MOF)-derived N-doped ordered hierarchically porous carbon (S-NOHPC) synthesized by a confined crystal growth and template-assisted method demonstrates excellent electrochemical performance as a host material for Li-Se battery. The large number of micropores inherited from the MOF structure provides large space and surface for Se loading and reaction sites, ensuring the high energy density of the battery. The in-situ X-ray diffraction (XRD) technique is used to understand the reaction mechanism. The synergy of the interconnected three-scale-level micro-meso-macroporous structure and N-doped polar sites can buffer the volume expansion, shorten the ion transportation with a very high diffusion coefficient of 4.44 × 10 −10 cm 2 s −1 and accelerate the lithiation/delithiation reaction. Selenium is sufficiently reactive and the polyselenide intermediates are tightly fixed inside the carbon host material, thereby achieving excellent specific capacity, stability, and rate capability. Such a cathode exhibits a very high 2 nd discharge/charge capacity of 658 and 683 mA h g −1, respectively, and retains a very high capacity of 367 mA h g −1 after 200 cycles at the current of 0.2 C. Even at the high current of 5 C, a very high discharge capacity of 230 mA h g −1 is obtained. This work provides a new kind of high-performance porous materials with rational pore arrangement applicable for highly efficient energy storage. [Figure not available: see fulltext.]
Translated title of the contribution | Boosting reaction kinetics and shuttle effect suppression by single crystal MOF-derived N-doped ordered hierarchically porous carbon for high performance Li-Se battery |
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Original language | Chinese (Traditional) |
Pages (from-to) | 2975-2988 |
Number of pages | 14 |
Journal | Science China Materials |
Volume | 65 |
Issue number | 11 |
DOIs | |
Publication status | Published - Nov 2022 |
Funding
Li H thanks the financial support from the China Scholarship Council (201809370046) and a scholarship from the Laboratory of Inorganic Materials Chemistry, Université de Namur. The authors thank Prof. Alexandru Vlad for his UV-vis absorption test supporting. This research used resources of Electron Microscopy Service located at the University of Namur. This service is member of the “Plateforme Technologique Morphologie-Imagerie”. This work was supported by the National Postdoctoral Program (2020M672782), the National Natural Science Foundation of China (U1663225), Changjiang Scholars and Innovative Research Team in University (IRT_15R52), the Program of Introducing Talents of Discipline to Universities-Plan 111 (B20002) from the Ministry of Science and Technology and the Ministry of Education of China, and the National Key R&D Program of China (2016YFA0202602). Li H designed the samples, performed the experiments, and wrote the paper with the support from Profs. Su BL and Li Y. Profs. Su BL and Li Y provided financial support. Li C, Sun MH, and Dong W gave the experimental guidance and advices. Wang Y performed the TEM testing. Barakat T made language modifications. All authors contributed to the general discussion. Profs. Su BL and Li Y revised and finalized the manuscript.
Funders | Funder number |
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National Postdoctoral Program | 2020M672782 |
Plateforme Technologique Morphologie-Imagerie | |
National Natural Science Foundation of China | U1663225 |
National Natural Science Foundation of China | |
Ministry of Education of the People's Republic of China | |
Ministry of Science and Technology | |
China Scholarship Council | 201809370046 |
China Scholarship Council | |
Changjiang Scholar Program of Chinese Ministry of Education | IRT_15R52 |
Changjiang Scholar Program of Chinese Ministry of Education | |
National Key Research and Development Program of China | 2016YFA0202602 |
National Key Research and Development Program of China | |
Project 211 | B20002 |
Project 211 |
Keywords
- diffusion coefficient
- Li-Se battery
- N-doped ordered hierarchically porous carbon
- shuttle effect
- single crystal MOF
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