Al<sub>2</sub>O<sub>3</sub>-Coated Si-Alloy Prepared by Atomic Layer Deposition as Anodes for Lithium-Ion Batteries
Silicon-based anodes can increase the energy density of Li-ion batteries (LIBs) owing to their large weights and volumetric capacities. However, repeated charging and discharging can rapidly deteriorate the electrochemical properties because of a large volume change in the electrode. In this study,...
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MDPI AG
2022-06-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/12/4189 |
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| author | Kikang Lee Sungho Yoon Sunghoon Hong Hyunmi Kim Kyuhwan Oh Jeongtak Moon |
| author_facet | Kikang Lee Sungho Yoon Sunghoon Hong Hyunmi Kim Kyuhwan Oh Jeongtak Moon |
| author_sort | Kikang Lee |
| collection | DOAJ |
| description | Silicon-based anodes can increase the energy density of Li-ion batteries (LIBs) owing to their large weights and volumetric capacities. However, repeated charging and discharging can rapidly deteriorate the electrochemical properties because of a large volume change in the electrode. In this study, a commercial Fe-Si powder was coated with Al<sub>2</sub>O<sub>3</sub> layers of different thicknesses via atomic layer deposition (ALD) to prevent the volume expansion of Si and suppress the formation of crack-induced solid electrolyte interfaces. The Al<sub>2</sub>O<sub>3</sub> content was controlled by adjusting the trimethyl aluminum exposure time, and higher Al<sub>2</sub>O<sub>3</sub> contents significantly improved the electrochemical properties. In 300 cycles, the capacity retention rate of a pouch full-cell containing the fabricated anodes increased from 69.8% to 72.3% and 79.1% depending on the Al<sub>2</sub>O<sub>3</sub> content. The powder characterization and coin and pouch cell cycle evaluation results confirmed the formation of an Al<sub>2</sub>O<sub>3</sub> layer on the powder surface. Furthermore, the expansion rate observed during the charging/discharging of the pouch cell indicated that the deposited layer suppressed the powder expansion and improved the cell stability. Thus, the performance of an LIB containing Si-alloy anodes can be improved by coating an ALD-synthesized protective Al<sub>2</sub>O<sub>3</sub> layer. |
| first_indexed | 2024-03-09T23:12:15Z |
| format | Article |
| id | doaj.art-eae7ad4cb31540c9a413d870217164e8 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T23:12:15Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-eae7ad4cb31540c9a413d870217164e82023-11-23T17:44:10ZengMDPI AGMaterials1996-19442022-06-011512418910.3390/ma15124189Al<sub>2</sub>O<sub>3</sub>-Coated Si-Alloy Prepared by Atomic Layer Deposition as Anodes for Lithium-Ion BatteriesKikang Lee0Sungho Yoon1Sunghoon Hong2Hyunmi Kim3Kyuhwan Oh4Jeongtak Moon5Research and Development Center, MK Electron, Yongin-si 17030, KoreaElectronic Convergence Materials and Device Research Center, Korea Electronics Technology Institute (KETI), Seongnam-si 13509, KoreaResearch and Development Center, MK Electron, Yongin-si 17030, KoreaElectronic Convergence Materials and Device Research Center, Korea Electronics Technology Institute (KETI), Seongnam-si 13509, KoreaDepartment of Materials Science and Engineering, Seoul National University, Seoul-si 08826, KoreaResearch and Development Center, MK Electron, Yongin-si 17030, KoreaSilicon-based anodes can increase the energy density of Li-ion batteries (LIBs) owing to their large weights and volumetric capacities. However, repeated charging and discharging can rapidly deteriorate the electrochemical properties because of a large volume change in the electrode. In this study, a commercial Fe-Si powder was coated with Al<sub>2</sub>O<sub>3</sub> layers of different thicknesses via atomic layer deposition (ALD) to prevent the volume expansion of Si and suppress the formation of crack-induced solid electrolyte interfaces. The Al<sub>2</sub>O<sub>3</sub> content was controlled by adjusting the trimethyl aluminum exposure time, and higher Al<sub>2</sub>O<sub>3</sub> contents significantly improved the electrochemical properties. In 300 cycles, the capacity retention rate of a pouch full-cell containing the fabricated anodes increased from 69.8% to 72.3% and 79.1% depending on the Al<sub>2</sub>O<sub>3</sub> content. The powder characterization and coin and pouch cell cycle evaluation results confirmed the formation of an Al<sub>2</sub>O<sub>3</sub> layer on the powder surface. Furthermore, the expansion rate observed during the charging/discharging of the pouch cell indicated that the deposited layer suppressed the powder expansion and improved the cell stability. Thus, the performance of an LIB containing Si-alloy anodes can be improved by coating an ALD-synthesized protective Al<sub>2</sub>O<sub>3</sub> layer.https://www.mdpi.com/1996-1944/15/12/4189anode materialslithium-ion batteryatomic layer depositionsilicon nanocompositeAl<sub>2</sub>O<sub>3</sub> layersingle layer pouch cell |
| spellingShingle | Kikang Lee Sungho Yoon Sunghoon Hong Hyunmi Kim Kyuhwan Oh Jeongtak Moon Al<sub>2</sub>O<sub>3</sub>-Coated Si-Alloy Prepared by Atomic Layer Deposition as Anodes for Lithium-Ion Batteries Materials anode materials lithium-ion battery atomic layer deposition silicon nanocomposite Al<sub>2</sub>O<sub>3</sub> layer single layer pouch cell |
| title | Al<sub>2</sub>O<sub>3</sub>-Coated Si-Alloy Prepared by Atomic Layer Deposition as Anodes for Lithium-Ion Batteries |
| title_full | Al<sub>2</sub>O<sub>3</sub>-Coated Si-Alloy Prepared by Atomic Layer Deposition as Anodes for Lithium-Ion Batteries |
| title_fullStr | Al<sub>2</sub>O<sub>3</sub>-Coated Si-Alloy Prepared by Atomic Layer Deposition as Anodes for Lithium-Ion Batteries |
| title_full_unstemmed | Al<sub>2</sub>O<sub>3</sub>-Coated Si-Alloy Prepared by Atomic Layer Deposition as Anodes for Lithium-Ion Batteries |
| title_short | Al<sub>2</sub>O<sub>3</sub>-Coated Si-Alloy Prepared by Atomic Layer Deposition as Anodes for Lithium-Ion Batteries |
| title_sort | al sub 2 sub o sub 3 sub coated si alloy prepared by atomic layer deposition as anodes for lithium ion batteries |
| topic | anode materials lithium-ion battery atomic layer deposition silicon nanocomposite Al<sub>2</sub>O<sub>3</sub> layer single layer pouch cell |
| url | https://www.mdpi.com/1996-1944/15/12/4189 |
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