Addressing Fundamental Challenges of Si/Gr Electrodes with High Silicon Contents Using Innovative Bilayer Electrode Structure Design
The extremely high volume change of Si during alloying and dealloying in the charge/discharge process is a key challenge for increasing the Si content in Si/Gr electrodes. To address these fundamental challenges, a sophisticated bilayer Si/Gr electrode composed of an upper layer with a porous struct...
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2025-02-01
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| Series: | Small Structures |
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| Online Access: | https://doi.org/10.1002/sstr.202400433 |
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| author | Jeong Hyeon Yoo Sung Joon Park Cheol Bak Yong Min Lee Ki Jae Kim |
| author_facet | Jeong Hyeon Yoo Sung Joon Park Cheol Bak Yong Min Lee Ki Jae Kim |
| author_sort | Jeong Hyeon Yoo |
| collection | DOAJ |
| description | The extremely high volume change of Si during alloying and dealloying in the charge/discharge process is a key challenge for increasing the Si content in Si/Gr electrodes. To address these fundamental challenges, a sophisticated bilayer Si/Gr electrode composed of an upper layer with a porous structure and a lower layer with a compact structure to increase the Si content while enhancing the long‐term cycling stability of the electrode is designed. The unique structure of the bilayer Si/Gr electrode is achieved by controlling the densities of the upper and lower electrode layers. The porous structure of the upper layer can accommodate the volume expansion of Si, thereby increasing the Si content of the Si/Gr electrode. The compact structure of the lower layer can suppress the delamination of the electrode by the volume expansion of Si due to its high binding strength with the current collector, thus ensuring the long‐term stability of the Si/Gr electrode. Consequently, because of the distinct features of the upper and lower layers in the bilayer Si/Gr electrode, superior cyclability is achieved despite an increase in the total Si content to 30 wt% in the Si/Gr electrode, with a specific capacity of 534.8 mAh g−1 after 100 cycles. |
| format | Article |
| id | doaj-art-1a2a06334b7f470c806f0fcfdca1511e |
| institution | Kabale University |
| issn | 2688-4062 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Small Structures |
| spelling | doaj-art-1a2a06334b7f470c806f0fcfdca1511e2025-02-04T08:10:21ZengWiley-VCHSmall Structures2688-40622025-02-0162n/an/a10.1002/sstr.202400433Addressing Fundamental Challenges of Si/Gr Electrodes with High Silicon Contents Using Innovative Bilayer Electrode Structure DesignJeong Hyeon Yoo0Sung Joon Park1Cheol Bak2Yong Min Lee3Ki Jae Kim4Department of Energy Science Sungkyunkwan University Suwon Gyeonggi‐do 16419 Republic of KoreaDepartment of Energy Science Sungkyunkwan University Suwon Gyeonggi‐do 16419 Republic of KoreaDepartment of Energy Science & Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 South KoreaDepartment of Energy Science & Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 South KoreaDepartment of Energy Science Sungkyunkwan University Suwon Gyeonggi‐do 16419 Republic of KoreaThe extremely high volume change of Si during alloying and dealloying in the charge/discharge process is a key challenge for increasing the Si content in Si/Gr electrodes. To address these fundamental challenges, a sophisticated bilayer Si/Gr electrode composed of an upper layer with a porous structure and a lower layer with a compact structure to increase the Si content while enhancing the long‐term cycling stability of the electrode is designed. The unique structure of the bilayer Si/Gr electrode is achieved by controlling the densities of the upper and lower electrode layers. The porous structure of the upper layer can accommodate the volume expansion of Si, thereby increasing the Si content of the Si/Gr electrode. The compact structure of the lower layer can suppress the delamination of the electrode by the volume expansion of Si due to its high binding strength with the current collector, thus ensuring the long‐term stability of the Si/Gr electrode. Consequently, because of the distinct features of the upper and lower layers in the bilayer Si/Gr electrode, superior cyclability is achieved despite an increase in the total Si content to 30 wt% in the Si/Gr electrode, with a specific capacity of 534.8 mAh g−1 after 100 cycles.https://doi.org/10.1002/sstr.202400433bilayer electrodescomponent gradientselectrode structuresporosity gradientssilicon/graphite anode |
| spellingShingle | Jeong Hyeon Yoo Sung Joon Park Cheol Bak Yong Min Lee Ki Jae Kim Addressing Fundamental Challenges of Si/Gr Electrodes with High Silicon Contents Using Innovative Bilayer Electrode Structure Design Small Structures bilayer electrodes component gradients electrode structures porosity gradients silicon/graphite anode |
| title | Addressing Fundamental Challenges of Si/Gr Electrodes with High Silicon Contents Using Innovative Bilayer Electrode Structure Design |
| title_full | Addressing Fundamental Challenges of Si/Gr Electrodes with High Silicon Contents Using Innovative Bilayer Electrode Structure Design |
| title_fullStr | Addressing Fundamental Challenges of Si/Gr Electrodes with High Silicon Contents Using Innovative Bilayer Electrode Structure Design |
| title_full_unstemmed | Addressing Fundamental Challenges of Si/Gr Electrodes with High Silicon Contents Using Innovative Bilayer Electrode Structure Design |
| title_short | Addressing Fundamental Challenges of Si/Gr Electrodes with High Silicon Contents Using Innovative Bilayer Electrode Structure Design |
| title_sort | addressing fundamental challenges of si gr electrodes with high silicon contents using innovative bilayer electrode structure design |
| topic | bilayer electrodes component gradients electrode structures porosity gradients silicon/graphite anode |
| url | https://doi.org/10.1002/sstr.202400433 |
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