| 초록 |
With the recent development in portable electronics, lithium-ion batteries (LIBs) have become the most widely used power source. However, as much as the performance of the batteries has become important, safety concerns such as explosions due to overheating the fire hazard. In this study, we focused on solving the safety problems by developing a novel heat-resistant separator based on a coaxial electrospinning method. The proposed separator in this study consisted of a core polymer with thermoplastic polyurethane (PU) and polyimide (PI) as a shell polymer. The electrospun PI@PU separator using thermally stable PI and stretchable PU has higher thermal stability, mechanical properties, and electrochemical performance compared to those for polyolefin membranes (commercial PE separators). Compared to the commercial PE separators, the electrospun PI@PU separators have higher thermal stability upon exposure to 180°C for 30 minutes and superior electrolyte wettability related to their electrochemical properties. This simple method of coaxial electrospinning can be promising candidates as a new route to preparing a practical separator for safe and high-performance LIBs. |
