Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries
Silicon has gained considerable attention as an anode material in lithium-ion batteries due to its high theoretical capacity. However, the significant volume changes that occur during lithiation/delithiation processes often result in poor cycling stability of silicon anodes. In this study, a hybrid...
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MDPI AG
2023-05-01
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| Series: | Batteries |
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| Online Access: | https://www.mdpi.com/2313-0105/9/5/276 |
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| author | Xuejian Zeng Hongyan Yue Jina Wu Chao Chen Lichun Liu |
| author_facet | Xuejian Zeng Hongyan Yue Jina Wu Chao Chen Lichun Liu |
| author_sort | Xuejian Zeng |
| collection | DOAJ |
| description | Silicon has gained considerable attention as an anode material in lithium-ion batteries due to its high theoretical capacity. However, the significant volume changes that occur during lithiation/delithiation processes often result in poor cycling stability of silicon anodes. In this study, a hybrid ionically covalently cross-linked network binder carboxymethylcellulose-hyperbranched polyethyleneimine (CMC-HBPEI) is successfully constructed by “switching” ionic bonds and partially “converting” them to covalent bonds to buffer the volume variation of silicon anodes. In this hybrid cross-linked network, the covalently cross-linked network is responsible for maintaining the structural integrity of the anode, while the ionically cross-linked network utilizes the bonding reversibility to sustainably dissipative the mechanical stress and self-heal the structural breakages generated from the lithiation expansion of silicon. By changing the drying temperature of the anode, the ratio of covalent and ionic bonds in the hybrid cross-linked network can be adjusted to balance the mechanical stability and bonding reversibility of the CMC-HBPEI binder. Even after 300 cycles of charging/discharging under a current density of 500 mAg<sup>−1</sup>, the specific capacity of the optimized Si/CMC-HBPEI anode remains at 1545 mAhg<sup>−1</sup>. |
| first_indexed | 2024-03-11T03:56:26Z |
| format | Article |
| id | doaj.art-1d34b6383ff94d11aa7ac396fe8ac48b |
| institution | Directory Open Access Journal |
| issn | 2313-0105 |
| language | English |
| last_indexed | 2024-03-11T03:56:26Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
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| series | Batteries |
| spelling | doaj.art-1d34b6383ff94d11aa7ac396fe8ac48b2023-11-18T00:28:49ZengMDPI AGBatteries2313-01052023-05-019527610.3390/batteries9050276Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion BatteriesXuejian Zeng0Hongyan Yue1Jina Wu2Chao Chen3Lichun Liu4School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, ChinaSchool of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, ChinaNanotechnology Research Institute, Jiaxing University, Jiaxing 314001, ChinaNanotechnology Research Institute, Jiaxing University, Jiaxing 314001, ChinaNanotechnology Research Institute, Jiaxing University, Jiaxing 314001, ChinaSilicon has gained considerable attention as an anode material in lithium-ion batteries due to its high theoretical capacity. However, the significant volume changes that occur during lithiation/delithiation processes often result in poor cycling stability of silicon anodes. In this study, a hybrid ionically covalently cross-linked network binder carboxymethylcellulose-hyperbranched polyethyleneimine (CMC-HBPEI) is successfully constructed by “switching” ionic bonds and partially “converting” them to covalent bonds to buffer the volume variation of silicon anodes. In this hybrid cross-linked network, the covalently cross-linked network is responsible for maintaining the structural integrity of the anode, while the ionically cross-linked network utilizes the bonding reversibility to sustainably dissipative the mechanical stress and self-heal the structural breakages generated from the lithiation expansion of silicon. By changing the drying temperature of the anode, the ratio of covalent and ionic bonds in the hybrid cross-linked network can be adjusted to balance the mechanical stability and bonding reversibility of the CMC-HBPEI binder. Even after 300 cycles of charging/discharging under a current density of 500 mAg<sup>−1</sup>, the specific capacity of the optimized Si/CMC-HBPEI anode remains at 1545 mAhg<sup>−1</sup>.https://www.mdpi.com/2313-0105/9/5/276carboxymethylcellulosehyperbranched polyethyleneiminehybrid cross-linked networksilicon anodelithium-ion battery |
| spellingShingle | Xuejian Zeng Hongyan Yue Jina Wu Chao Chen Lichun Liu Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries Batteries carboxymethylcellulose hyperbranched polyethyleneimine hybrid cross-linked network silicon anode lithium-ion battery |
| title | Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries |
| title_full | Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries |
| title_fullStr | Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries |
| title_full_unstemmed | Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries |
| title_short | Hybrid Ionically Covalently Cross-Linked Network Binder for High-Performance Silicon Anodes in Lithium-Ion Batteries |
| title_sort | hybrid ionically covalently cross linked network binder for high performance silicon anodes in lithium ion batteries |
| topic | carboxymethylcellulose hyperbranched polyethyleneimine hybrid cross-linked network silicon anode lithium-ion battery |
| url | https://www.mdpi.com/2313-0105/9/5/276 |
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