Synergistic Effect of Zn–Co Bimetallic Selenide Composites for Lithium–Sulfur Battery
Compared with monometallic selenides, heterogeneous bimetallic selenides have rich phase boundaries and superior electrical conductivity. ZnSe/CoSe<sub>2</sub> composites were prepared by introducing Zn metal and using ZIF-8/67 as the precursor through the synergistic effect between Zn a...
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MDPI AG
2023-06-01
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| Online Access: | https://www.mdpi.com/2313-0105/9/6/307 |
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| author | Deng Li Huinan Pan Zhonghai Lin Xiulian Qiu Xinyu Zhao Wei Yang Wenzhi Zheng Fengming Ren |
| author_facet | Deng Li Huinan Pan Zhonghai Lin Xiulian Qiu Xinyu Zhao Wei Yang Wenzhi Zheng Fengming Ren |
| author_sort | Deng Li |
| collection | DOAJ |
| description | Compared with monometallic selenides, heterogeneous bimetallic selenides have rich phase boundaries and superior electrical conductivity. ZnSe/CoSe<sub>2</sub> composites were prepared by introducing Zn metal and using ZIF-8/67 as the precursor through the synergistic effect between Zn and Co after selenification. The electrocatalytic conversion of polysulfide is accelerated by ZnSe through chemical adsorption and the catalytic effect. The conductive CoSe<sub>2</sub> surface provides a rapid diffusion path for lithium ions, accelerating the conversion of the polysulfide. On the basis of their individual strengths, ZnSe and CoSe<sub>2</sub> can jointly promote the smooth adsorptive–diffuse–catalytic conversion process of polysulfide and induce the growth of lithium sulfide around its heterogeneous interface, thus enhancing the electrochemical performance of the lithium–sulfur battery cathode materials. The ZnSe/CoSe<sub>2</sub>–S electrode, at the optimal Zn-to-Co ratio of 1:1, has a 790.06 mAh g<sup>−1</sup> initial specific capacity at 0.2 C and excellent cycling stability at 1 C. After 300 cycles, the final capacity is 300.85 mAh g<sup>−1</sup>, and the capacity retention rate reaches 82.71%. |
| first_indexed | 2024-03-11T02:46:52Z |
| format | Article |
| id | doaj.art-7ef5288caf0d4bae881bd0906c97094e |
| institution | Directory Open Access Journal |
| issn | 2313-0105 |
| language | English |
| last_indexed | 2024-03-11T02:46:52Z |
| publishDate | 2023-06-01 |
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| spelling | doaj.art-7ef5288caf0d4bae881bd0906c97094e2023-11-18T09:17:46ZengMDPI AGBatteries2313-01052023-06-019630710.3390/batteries9060307Synergistic Effect of Zn–Co Bimetallic Selenide Composites for Lithium–Sulfur BatteryDeng Li0Huinan Pan1Zhonghai Lin2Xiulian Qiu3Xinyu Zhao4Wei Yang5Wenzhi Zheng6Fengming Ren7School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, ChinaCompared with monometallic selenides, heterogeneous bimetallic selenides have rich phase boundaries and superior electrical conductivity. ZnSe/CoSe<sub>2</sub> composites were prepared by introducing Zn metal and using ZIF-8/67 as the precursor through the synergistic effect between Zn and Co after selenification. The electrocatalytic conversion of polysulfide is accelerated by ZnSe through chemical adsorption and the catalytic effect. The conductive CoSe<sub>2</sub> surface provides a rapid diffusion path for lithium ions, accelerating the conversion of the polysulfide. On the basis of their individual strengths, ZnSe and CoSe<sub>2</sub> can jointly promote the smooth adsorptive–diffuse–catalytic conversion process of polysulfide and induce the growth of lithium sulfide around its heterogeneous interface, thus enhancing the electrochemical performance of the lithium–sulfur battery cathode materials. The ZnSe/CoSe<sub>2</sub>–S electrode, at the optimal Zn-to-Co ratio of 1:1, has a 790.06 mAh g<sup>−1</sup> initial specific capacity at 0.2 C and excellent cycling stability at 1 C. After 300 cycles, the final capacity is 300.85 mAh g<sup>−1</sup>, and the capacity retention rate reaches 82.71%.https://www.mdpi.com/2313-0105/9/6/307synergistic effectZn–Co bimetallic selenideZIFcathode materialslithium–sulfur battery |
| spellingShingle | Deng Li Huinan Pan Zhonghai Lin Xiulian Qiu Xinyu Zhao Wei Yang Wenzhi Zheng Fengming Ren Synergistic Effect of Zn–Co Bimetallic Selenide Composites for Lithium–Sulfur Battery Batteries synergistic effect Zn–Co bimetallic selenide ZIF cathode materials lithium–sulfur battery |
| title | Synergistic Effect of Zn–Co Bimetallic Selenide Composites for Lithium–Sulfur Battery |
| title_full | Synergistic Effect of Zn–Co Bimetallic Selenide Composites for Lithium–Sulfur Battery |
| title_fullStr | Synergistic Effect of Zn–Co Bimetallic Selenide Composites for Lithium–Sulfur Battery |
| title_full_unstemmed | Synergistic Effect of Zn–Co Bimetallic Selenide Composites for Lithium–Sulfur Battery |
| title_short | Synergistic Effect of Zn–Co Bimetallic Selenide Composites for Lithium–Sulfur Battery |
| title_sort | synergistic effect of zn co bimetallic selenide composites for lithium sulfur battery |
| topic | synergistic effect Zn–Co bimetallic selenide ZIF cathode materials lithium–sulfur battery |
| url | https://www.mdpi.com/2313-0105/9/6/307 |
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