Optimization of AlOOH powder characteristics for enhanced separator performance and stability in lithium-ion batteries
摘要
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.