Stable immobilization of lithium polysulfides using three‐dimensional ordered mesoporous Mn2O3 as the host material in lithium–sulfur batteries

Author:

Park Sung Joon1,Choi Yun Jeong2,Kim Hyun‐seung3,Hong Min Joo4,Chang Hongjun5,Moon Janghyuk5ORCID,Kim Young‐Jun67ORCID,Mun Junyoung78ORCID,Kim Ki Jae17ORCID

Affiliation:

1. Department of Energy Science Sungkyunkwan University Suwon Gyeonggi‐do Republic of Korea

2. Department of Energy Engineering Konkuk University Seoul Republic of Korea

3. Advanced Batteries Research Center Seongnam Republic of Korea

4. Department of Future Energy Engineering Sungkyunkwan University Suwon Republic of Korea

5. Department of Energy Systems Engineering Chung‐Ang University Seoul Republic of Korea

6. SKKU Advanced Institute of Nanotechnology Sungkyunkwan University Suwon Gyeonggi‐do Republic of Korea

7. SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University Suwon Republic of Korea

8. School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon Republic of Korea

Abstract

AbstractLithium–sulfur batteries (LSBs) have drawn significant attention owing to their high theoretical discharge capacity and energy density. However, the dissolution of long‐chain polysulfides into the electrolyte during the charge and discharge process (“shuttle effect”) results in fast capacity fading and inferior electrochemical performance. In this study, Mn2O3 with an ordered mesoporous structure (OM‐Mn2O3) was designed as a cathode host for LSBs via KIT‐6 hard templating, to effectively inhibit the polysulfide shuttle effect. OM‐Mn2O3 offers numerous pores to confine sulfur and tightly anchor the dissolved polysulfides through the combined effects of strong polar–polar interactions, polysulfides, and sulfur chain catenation. The OM‐Mn2O3/S composite electrode delivered a discharge capacity of 561 mA h g−1 after 250 cycles at 0.5 C owing to the excellent performance of OM‐Mn2O3. Furthermore, it retained a discharge capacity of 628 mA h g−1 even at a rate of 2 C, which was significantly higher than that of a pristine sulfur electrode (206 mA h g−1). These findings provide a prospective strategy for designing cathode materials for high‐performance LSBs.

Funder

Ministry of Trade, Industry and Energy

Korea Evaluation Institute of Industrial Technology

Publisher

Wiley

Subject

Materials Chemistry,Energy (miscellaneous),Materials Science (miscellaneous),Renewable Energy, Sustainability and the Environment

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