GeO<sub>2</sub> Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage Anode
Germanium oxide (GeO<sub>2</sub>) is a high theoretical capacity electrode material due to its alloying and conversion reaction. However, the actual cycling capacity is rather poor on account of suffering low electron/ion conductivity, enormous volume change and agglomeration in the repe...
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MDPI AG
2023-09-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/18/6730 |
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| author | Wenhe Xie Congcong Liu Chen Hu Yuanxiao Ma Xuefeng Li Qian Wang Zhe An Shenghong Liu Haibin Sun Xiaolei Sun |
| author_facet | Wenhe Xie Congcong Liu Chen Hu Yuanxiao Ma Xuefeng Li Qian Wang Zhe An Shenghong Liu Haibin Sun Xiaolei Sun |
| author_sort | Wenhe Xie |
| collection | DOAJ |
| description | Germanium oxide (GeO<sub>2</sub>) is a high theoretical capacity electrode material due to its alloying and conversion reaction. However, the actual cycling capacity is rather poor on account of suffering low electron/ion conductivity, enormous volume change and agglomeration in the repeated lithiation/delithiation process, which renders quite a low reversible electrochemical lithium storage reaction. In this work, highly amorphous GeO<sub>2</sub> particles are uniformly distributed in the carbon nanofiber framework, and the amorphous carbon nanofiber not only improves the conduction and buffers the volume changes but also prevents active material agglomeration. As a result, the present GeO<sub>2</sub> and carbon composite electrode exhibits highly reversible alloying and conversion processes during the whole cycling process. The two reversible electrochemical reactions are verified by differential capacity curves and cyclic voltammetry measurements during the whole cycling process. The corresponding reversible capacity is 747 mAh g<sup>−1</sup> after 300 cycles at a current density of 0.3 A g<sup>−1</sup>. The related reversible capacities are 933, 672, 487 and 302 mAh g<sup>−1</sup> at current densities of 0.2, 0.4, 0.8 and 1.6 A g<sup>−1</sup>, respectively. The simple strategy for the design of amorphous GeO<sub>2</sub>/carbon composites enables potential application for high-performance LIBs. |
| first_indexed | 2024-03-10T22:23:01Z |
| format | Article |
| id | doaj.art-2f03181ad47c4392b205a9fdb8b93e90 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T22:23:01Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj.art-2f03181ad47c4392b205a9fdb8b93e902023-11-19T12:11:39ZengMDPI AGMolecules1420-30492023-09-012818673010.3390/molecules28186730GeO<sub>2</sub> Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage AnodeWenhe Xie0Congcong Liu1Chen Hu2Yuanxiao Ma3Xuefeng Li4Qian Wang5Zhe An6Shenghong Liu7Haibin Sun8Xiaolei Sun9Key Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaKey Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaKey Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaKey Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaKey Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaKey Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaKey Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaKey Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaKey Laboratory of Microelectronics and Energy of Henan Province, Xinyang Normal University, Xinyang 464000, ChinaSchool of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Nankai University, Tianjin 300350, ChinaGermanium oxide (GeO<sub>2</sub>) is a high theoretical capacity electrode material due to its alloying and conversion reaction. However, the actual cycling capacity is rather poor on account of suffering low electron/ion conductivity, enormous volume change and agglomeration in the repeated lithiation/delithiation process, which renders quite a low reversible electrochemical lithium storage reaction. In this work, highly amorphous GeO<sub>2</sub> particles are uniformly distributed in the carbon nanofiber framework, and the amorphous carbon nanofiber not only improves the conduction and buffers the volume changes but also prevents active material agglomeration. As a result, the present GeO<sub>2</sub> and carbon composite electrode exhibits highly reversible alloying and conversion processes during the whole cycling process. The two reversible electrochemical reactions are verified by differential capacity curves and cyclic voltammetry measurements during the whole cycling process. The corresponding reversible capacity is 747 mAh g<sup>−1</sup> after 300 cycles at a current density of 0.3 A g<sup>−1</sup>. The related reversible capacities are 933, 672, 487 and 302 mAh g<sup>−1</sup> at current densities of 0.2, 0.4, 0.8 and 1.6 A g<sup>−1</sup>, respectively. The simple strategy for the design of amorphous GeO<sub>2</sub>/carbon composites enables potential application for high-performance LIBs.https://www.mdpi.com/1420-3049/28/18/6730GeO<sub>2</sub>amorphouslithium-ion batteriesalloy reactionconversion reactionreversible electrode |
| spellingShingle | Wenhe Xie Congcong Liu Chen Hu Yuanxiao Ma Xuefeng Li Qian Wang Zhe An Shenghong Liu Haibin Sun Xiaolei Sun GeO<sub>2</sub> Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage Anode Molecules GeO<sub>2</sub> amorphous lithium-ion batteries alloy reaction conversion reaction reversible electrode |
| title | GeO<sub>2</sub> Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage Anode |
| title_full | GeO<sub>2</sub> Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage Anode |
| title_fullStr | GeO<sub>2</sub> Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage Anode |
| title_full_unstemmed | GeO<sub>2</sub> Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage Anode |
| title_short | GeO<sub>2</sub> Nanoparticles Decorated in Amorphous Carbon Nanofiber Framework as Highly Reversible Lithium Storage Anode |
| title_sort | geo sub 2 sub nanoparticles decorated in amorphous carbon nanofiber framework as highly reversible lithium storage anode |
| topic | GeO<sub>2</sub> amorphous lithium-ion batteries alloy reaction conversion reaction reversible electrode |
| url | https://www.mdpi.com/1420-3049/28/18/6730 |
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