Reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient Li-Se batteries
Abstract Lithium-selenium (Li-Se) batteries possess high volumetric capacity and have attracted considerable attention as a high energy storage system. However, the shuttling of polyselenides seriously worsens the electrochemical performance and retards their application advancement. Herein, we engi...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Springer
2023-09-01
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| Series: | Carbon Research |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s44246-023-00064-2 |
| _version_ | 1797556097736769536 |
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| author | Hongrui Wang Qingyuan Zhao Kang Lai Nanyun Bao Weibin Zhou Qi Deng Zhiqiang Fu Jiayu Dai Xiongwei Wu Xianxiang Zeng |
| author_facet | Hongrui Wang Qingyuan Zhao Kang Lai Nanyun Bao Weibin Zhou Qi Deng Zhiqiang Fu Jiayu Dai Xiongwei Wu Xianxiang Zeng |
| author_sort | Hongrui Wang |
| collection | DOAJ |
| description | Abstract Lithium-selenium (Li-Se) batteries possess high volumetric capacity and have attracted considerable attention as a high energy storage system. However, the shuttling of polyselenides seriously worsens the electrochemical performance and retards their application advancement. Herein, we engineered a bifunctional membrane consisted of polyethylenimine derived carbon quantum dots (Cdots) to efficiently restrict the shuttling of polyselenides under a high Se loading (Se≈70 wt%) and promote Li-Se conversion kinetics, which can be accounted by the greatly accelerated transportation of charge carriers and dipole–dipole interactions between polar moieties and long-chain polyselenides (Li2Se4 and Li2Se6) as corroborated by theoretical calculations. Thus, the bifunctional membrane endows Li-Se batteries with a specific capacity of 658.60 mAh g−1 at 0.1 C and coulombic efficiency of 97.8% in average, and demonstrates the effectiveness of defect-rich Cdots on suppressing polyselenides shuttling and reinforcing Li-Se conversion kinetics in augmenting the battery’s durability and efficiency. Graphical Abstract |
| first_indexed | 2024-03-10T16:56:52Z |
| format | Article |
| id | doaj.art-67eb439fb0a249aabbbcf12bcdac0b9c |
| institution | Directory Open Access Journal |
| issn | 2731-6696 |
| language | English |
| last_indexed | 2024-03-10T16:56:52Z |
| publishDate | 2023-09-01 |
| publisher | Springer |
| record_format | Article |
| series | Carbon Research |
| spelling | doaj.art-67eb439fb0a249aabbbcf12bcdac0b9c2023-11-20T11:05:31ZengSpringerCarbon Research2731-66962023-09-01211910.1007/s44246-023-00064-2Reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient Li-Se batteriesHongrui Wang0Qingyuan Zhao1Kang Lai2Nanyun Bao3Weibin Zhou4Qi Deng5Zhiqiang Fu6Jiayu Dai7Xiongwei Wu8Xianxiang Zeng9College of Agronomy, Hunan Agricultural UniversitySchool of Chemistry and Materials Science, Hunan Agricultural UniversityHunan Key Laboratory of Extreme Matter and Applications, National University of Defense TechnologyHunan Key Laboratory of Extreme Matter and Applications, National University of Defense TechnologyState Key Laboratory of Utilization of Woody Oil Resource of China, Hunan Provincial Key Laboratory of Oils and Fats Molecular Structure and Function, Hunan Academy of ForestryState Key Laboratory of Utilization of Woody Oil Resource of China, Hunan Provincial Key Laboratory of Oils and Fats Molecular Structure and Function, Hunan Academy of ForestryCollege of Agronomy, Hunan Agricultural UniversityHunan Key Laboratory of Extreme Matter and Applications, National University of Defense TechnologySchool of Chemistry and Materials Science, Hunan Agricultural UniversitySchool of Chemistry and Materials Science, Hunan Agricultural UniversityAbstract Lithium-selenium (Li-Se) batteries possess high volumetric capacity and have attracted considerable attention as a high energy storage system. However, the shuttling of polyselenides seriously worsens the electrochemical performance and retards their application advancement. Herein, we engineered a bifunctional membrane consisted of polyethylenimine derived carbon quantum dots (Cdots) to efficiently restrict the shuttling of polyselenides under a high Se loading (Se≈70 wt%) and promote Li-Se conversion kinetics, which can be accounted by the greatly accelerated transportation of charge carriers and dipole–dipole interactions between polar moieties and long-chain polyselenides (Li2Se4 and Li2Se6) as corroborated by theoretical calculations. Thus, the bifunctional membrane endows Li-Se batteries with a specific capacity of 658.60 mAh g−1 at 0.1 C and coulombic efficiency of 97.8% in average, and demonstrates the effectiveness of defect-rich Cdots on suppressing polyselenides shuttling and reinforcing Li-Se conversion kinetics in augmenting the battery’s durability and efficiency. Graphical Abstracthttps://doi.org/10.1007/s44246-023-00064-2Li-Se batteriesCarbon quantum dotsBifunctional membranePolyselenides shuttleHigh selenium loading |
| spellingShingle | Hongrui Wang Qingyuan Zhao Kang Lai Nanyun Bao Weibin Zhou Qi Deng Zhiqiang Fu Jiayu Dai Xiongwei Wu Xianxiang Zeng Reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient Li-Se batteries Carbon Research Li-Se batteries Carbon quantum dots Bifunctional membrane Polyselenides shuttle High selenium loading |
| title | Reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient Li-Se batteries |
| title_full | Reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient Li-Se batteries |
| title_fullStr | Reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient Li-Se batteries |
| title_full_unstemmed | Reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient Li-Se batteries |
| title_short | Reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient Li-Se batteries |
| title_sort | reinforcing conversion of polyselenides via a bifunctional blocking layer for efficient li se batteries |
| topic | Li-Se batteries Carbon quantum dots Bifunctional membrane Polyselenides shuttle High selenium loading |
| url | https://doi.org/10.1007/s44246-023-00064-2 |
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