| Optimization of AlOOH powder characteristics for enhanced separator performance and stability in lithium-ion batteries |
Da-Eun Hyun1,2, Joo-Young Han3, Ji-Hui Oh2,3, Yong-Nam Kim2, Chan-Woong Park4, Pyeong-Seop Seo4, Jong-Oh Baek4, Sang-Mo Koo3, Sunghoon Kim5, Dong-Won Lee2, Weon Ho Shin3, Jong-Min Oh3
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1Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
2Korea Testing Laboratory, Material Technology Center, 87 Digital-ro 26-gil, Guro-gu, Seoul, 08389, Republic of Korea
3Department of Electronic Materials Engineering, Kwangwoon University, 20 Kwangwoon-ro, Nowon-gu, Seoul, 01897, Republic of Korea
4Daejoo KC, 85 Sandanseobu-ro, Samho-eup, Yeongam-gun, Jeonnam, 58451, Republic of Korea
5Department of Applied Chemistry, Dong-Eui University, Busan, 47227, Republic of Korea |
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Received: August 28, 2024; Revised: October 28, 2024 Accepted: November 15, 2024. Published online: December 10, 2024. |
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| ABSTRACT |
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Inorganic materials have been explored as potential coating materials for lithium-ion battery (LIB) separators to improve the thermal stability and wettability of polyolefin-based separators. In this study, we have synthesized the AlOOH powders by controlling the particle sizes and specific surface areas through the facile synthesis processes. These synthesized AlOOH powders are coated on polyethylene separators, and we investigate the correlation between the powder characteristics and the performance of LIBs. Notably, a separator coated with medium-sized AlOOH powder (0.8 μm) with excellent flow properties demonstrates a uniform pore structure and enhanced interfacial adhesion, resulting in a significant improvement in thermal stability. In addition, the full cell performance with LiFePO4 as the cathode using these coated separators maintains a stable capacity retention of over 92% during 200 cycles at a high rate of 2 C. These findings highlight new powder characteristics that should be considered for optimizing the performance and stability of LIBs. |
| Key words:
AlOOH powder · Control of powder characteristics · AlOOH-coated separator · Electrochemical performance · Lithium-ion batteries |
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