Highly conductive S-doped FeSe2-xSx microsphere with high tap density for practical sodium storage
Metal selenides have been explored as promising sodium storage materials owing to their high theoretical capacity. However, sluggish Na+ diffusion and low electronic conductivity of selenides still hinder their practical applications. Herein, FeSe2-xSx microspheres have been prepared via a self-dopi...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co. Ltd.
2023-10-01
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| Series: | Advanced Powder Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772834X2300012X |
| _version_ | 1827793495155277824 |
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| author | Shuhao Xiao Jinxia Jiang Ying Zhu Jing Zhang Hanchao Li Rui Wu Xiaobin Niu Jiaqian Qin Jun Song Chen |
| author_facet | Shuhao Xiao Jinxia Jiang Ying Zhu Jing Zhang Hanchao Li Rui Wu Xiaobin Niu Jiaqian Qin Jun Song Chen |
| author_sort | Shuhao Xiao |
| collection | DOAJ |
| description | Metal selenides have been explored as promising sodium storage materials owing to their high theoretical capacity. However, sluggish Na+ diffusion and low electronic conductivity of selenides still hinder their practical applications. Herein, FeSe2-xSx microspheres have been prepared via a self-doping solvothermal method using NH4Fe(SO4)2 as both the Fe and S source, followed by gas phase selenization. The density functional theory calculation results reveal that S doping not only improves the Na adsorption, but also lower the diffusion energy barrier of Na atoms at the S doping sites, at the same time enhance the electronic conductivity of FeSe2-xSx. The carbon-free nature of the FeSe2-xSx microspheres results in a low specific surface area and a high tap density, leading to an initial columbic efficiency of 85.6%. Compared with pure FeSe2, such FeSe2-xSx delivers a high reversible capacity of 373.6 mAh·g−1 at a high current density of 5 A·g−1 after 2000 cycles and an enhanced rate performance of 305.8 mAh·g−1 at even 50 A·g−1. Finally, the FeSe2-xSx//NVP pouch cells have been assembled, achieving high energy and volumetric energy densities of 118 Wh·kg−1 and 272 mWh·cm−3, respectively, confirming the potential of applications for the FeSe2-xSx microspheres. |
| first_indexed | 2024-03-11T18:19:13Z |
| format | Article |
| id | doaj.art-8aca027491494e589a3056f5ae796b90 |
| institution | Directory Open Access Journal |
| issn | 2772-834X |
| language | English |
| last_indexed | 2024-03-11T18:19:13Z |
| publishDate | 2023-10-01 |
| publisher | KeAi Communications Co. Ltd. |
| record_format | Article |
| series | Advanced Powder Materials |
| spelling | doaj.art-8aca027491494e589a3056f5ae796b902023-10-16T04:12:58ZengKeAi Communications Co. Ltd.Advanced Powder Materials2772-834X2023-10-0124100120Highly conductive S-doped FeSe2-xSx microsphere with high tap density for practical sodium storageShuhao Xiao0Jinxia Jiang1Ying Zhu2Jing Zhang3Hanchao Li4Rui Wu5Xiaobin Niu6Jiaqian Qin7Jun Song Chen8Interdisciplinary Materials Research Center, Institute for Advanced Study, Chengdu University, Chengdu 610106, China; School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, ChinaChongqing Medical and Pharmaceutical College, Chongqing 401331, ChinaSchool of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, ChinaInterdisciplinary Materials Research Center, Institute for Advanced Study, Chengdu University, Chengdu 610106, ChinaSchool of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, ChinaSchool of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, ChinaSchool of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, ChinaCenter of Excellence on Advanced Materials for Energy Storage, Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, ThailandSchool of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China; Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Shenzhen 518100, China; Corresponding author. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China.Metal selenides have been explored as promising sodium storage materials owing to their high theoretical capacity. However, sluggish Na+ diffusion and low electronic conductivity of selenides still hinder their practical applications. Herein, FeSe2-xSx microspheres have been prepared via a self-doping solvothermal method using NH4Fe(SO4)2 as both the Fe and S source, followed by gas phase selenization. The density functional theory calculation results reveal that S doping not only improves the Na adsorption, but also lower the diffusion energy barrier of Na atoms at the S doping sites, at the same time enhance the electronic conductivity of FeSe2-xSx. The carbon-free nature of the FeSe2-xSx microspheres results in a low specific surface area and a high tap density, leading to an initial columbic efficiency of 85.6%. Compared with pure FeSe2, such FeSe2-xSx delivers a high reversible capacity of 373.6 mAh·g−1 at a high current density of 5 A·g−1 after 2000 cycles and an enhanced rate performance of 305.8 mAh·g−1 at even 50 A·g−1. Finally, the FeSe2-xSx//NVP pouch cells have been assembled, achieving high energy and volumetric energy densities of 118 Wh·kg−1 and 272 mWh·cm−3, respectively, confirming the potential of applications for the FeSe2-xSx microspheres.http://www.sciencedirect.com/science/article/pii/S2772834X2300012XFeSe2S-DopingHigh conductivityPouch cellPractical sodium-ion batteries |
| spellingShingle | Shuhao Xiao Jinxia Jiang Ying Zhu Jing Zhang Hanchao Li Rui Wu Xiaobin Niu Jiaqian Qin Jun Song Chen Highly conductive S-doped FeSe2-xSx microsphere with high tap density for practical sodium storage Advanced Powder Materials FeSe2 S-Doping High conductivity Pouch cell Practical sodium-ion batteries |
| title | Highly conductive S-doped FeSe2-xSx microsphere with high tap density for practical sodium storage |
| title_full | Highly conductive S-doped FeSe2-xSx microsphere with high tap density for practical sodium storage |
| title_fullStr | Highly conductive S-doped FeSe2-xSx microsphere with high tap density for practical sodium storage |
| title_full_unstemmed | Highly conductive S-doped FeSe2-xSx microsphere with high tap density for practical sodium storage |
| title_short | Highly conductive S-doped FeSe2-xSx microsphere with high tap density for practical sodium storage |
| title_sort | highly conductive s doped fese2 xsx microsphere with high tap density for practical sodium storage |
| topic | FeSe2 S-Doping High conductivity Pouch cell Practical sodium-ion batteries |
| url | http://www.sciencedirect.com/science/article/pii/S2772834X2300012X |
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