Volume 57, Issue 15 pp. 3916-3921
Communication

Metal–Organic Frameworks for High Charge–Discharge Rates in Lithium–Sulfur Batteries

Haoqing Jiang

Haoqing Jiang

Key Laboratory of Biomedical Polymers—Ministry of Education, College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072 PR China

These authors contributed equally to this work.

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Xiao-Chen Liu

Xiao-Chen Liu

Key Laboratory of Biomedical Polymers—Ministry of Education, College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072 PR China

These authors contributed equally to this work.

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Yushan Wu

Yushan Wu

Key Laboratory of Biomedical Polymers—Ministry of Education, College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072 PR China

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Yufei Shu

Yufei Shu

Key Laboratory of Biomedical Polymers—Ministry of Education, College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072 PR China

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Xuan Gong

Xuan Gong

Key Laboratory of Biomedical Polymers—Ministry of Education, College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072 PR China

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Prof. Fu-Sheng Ke

Corresponding Author

Prof. Fu-Sheng Ke

Key Laboratory of Biomedical Polymers—Ministry of Education, College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072 PR China

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Prof. Hexiang Deng

Corresponding Author

Prof. Hexiang Deng

Key Laboratory of Biomedical Polymers—Ministry of Education, College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072 PR China

UC Berkeley-Wuhan University Joint Innovative Center, The Institute for Advanced Studies, Wuhan University, Wuhan, 430072 PR China

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First published: 10 February 2018
Citations: 349

Graphical Abstract

MOF host S: The electrical conductivity of metal–organic frameworks (MOFs) was promoted by the construction of polymer–MOF composites. Using MOF-based sulfur hosts, the critical role of porosity at high charge–discharge rates in Li–S batteries was elucidated. MOFs with short ion transfer pathways and large pore apertures were identified as the most suitable for long-term cycling at extremely high rates.

Abstract

We report a new method to promote the conductivities of metal–organic frameworks (MOFs) by 5 to 7 magnitudes, thus their potential in electrochemical applications can be fully revealed. This method combines the polarity and porosity advantages of MOFs with the conductive feature of conductive polymers, in this case, polypyrrole (ppy), to construct ppy-MOF compartments for the confinement of sulfur in Li–S batteries. The performances of these ppy-S-in-MOF electrodes exceed those of their MOF and ppy counterparts, especially at high charge–discharge rates. For the first time, the critical role of ion diffusion to the high rate performance was elucidated by comparing ppy-MOF compartments with different pore geometries. The ppy-S-in-PCN-224 electrode with cross-linked pores and tunnels stood out, with a high capacity of 670 and 440 mAh g−1 at 10.0 C after 200 and 1000 cycles, respectively, representing a new benchmark for long-cycle performance at high rate in Li–S batteries.

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