Department of Polymer Engineering and ‡Department of Polymer Science, University of Akron , Akron, Ohio 44325, United States.
ACS Appl Mater Interfaces. 2017 Sep 13;9(36):30933-30942. doi: 10.1021/acsami.7b09155. Epub 2017 Aug 30.
This work focuses on ionogel membranes for use in Li-ion batteries fabricated from syndiotactic polystyrene (sPS) gels filled with ionic liquids (ILs). The aim is to increase the operating temperature of Li-ion batteries. Thermal stability and safe operation of Li-ion batteries are two key attributes for their success in hybrid vehicles and other high-temperature applications. The volatility of the liquid electrolytes in current lithium-ion battery technology causes thermal runaway leading to fire, explosion, and swelling of the cell. The approach followed in this work combines the thermal stability and ruggedness of sPS and the extremely low volatility of ILs. The performances of lithium metal/graphite half-cells fabricated with ionogel membranes and those with Celgard-3501 membranes are evaluated at both room temperature and at elevated temperatures of 100 °C. Our data show that the cells with ionogel membranes can be operated continuously at 100 °C without failure. In addition, better charge-discharge capacity is obtained due to high ionic conductivity and high electrolyte retention both derived from high porosity of sPS gels and better wetting of sPS by the ILs.
这项工作专注于用于锂离子电池的离子凝胶膜，这些电池由填充有离子液体 (IL) 的间规聚苯乙烯 (sPS) 凝胶制成。目的是提高锂离子电池的工作温度。锂离子电池的热稳定性和安全操作是其在混合动力汽车和其他高温应用中成功的两个关键属性。当前锂离子电池技术中液体电解质的挥发性导致热失控，从而导致火灾、爆炸和电池膨胀。本工作采用的方法结合了 sPS 的热稳定性和坚固性以及 IL 的极低挥发性。用离子凝胶膜和 Celgard-3501 膜制备的锂金属/石墨半电池在室温下和 100°C 的高温下进行了评估。我们的数据表明，带有离子凝胶膜的电池可以在 100°C 下连续运行而不会出现故障。此外，由于高 sPS 凝胶的高孔隙率和 IL 对 sPS 的更好润湿性，获得了更高的充放电容量，这归因于高离子电导率和高电解质保持率。
