The ceramic composite separators coated with silica or alumina particles have been used in power batteries due to their better electrolyte wettability and better thermal stability compared with bare polymer separators. However, these oxide ceramics are Li⁺ ion insulators, which increase internal resistance and hinder the improvement of rate capability of batteries. Herein, we report a strategy to further improving the performance of lithium-ion batteries (LIBs) by using fast ionic conductor ceramic composite separator as an alternative to traditional ceramic coated separators. Lithium lanthanum titanate (LLTO), a fast ionic conductor with excellent room temperature bulk conductivity, are coated on the common polyethylene (PE) separators. Our results demonstrate that such a novel LLTO-coated separator possess excellent electrolyte wettability and thermal stability; and the assembled NCM523/graphite lithium-ion pouch cells with LLTO-coated separator show better rate capability and cyclic performance with 88.7% capacity retention after 1000 cycles at room temperature compared with the pouch cells with Al₂O₃-coated separators. The fast ionic conductor ceramic composite separators will be a potential competitor to the next-generation novel separators for high-performance Li-ion power batteries.

与裸聚合物隔膜相比，涂有二氧化硅或氧化铝颗粒的陶瓷复合隔膜由于具有更好的电解质润湿性和更好的热稳定性而被用于动力电池。然而，这些氧化物陶瓷是 Li ⁺离子绝缘体，会增加内阻，阻碍电池倍率性能的提高。在此，我们报告了一种通过使用快速离子导体陶瓷复合隔膜作为传统陶瓷涂层隔膜的替代品来进一步提高锂离子电池 (LIB) 性能的策略。钛酸镧锂 (LLTO) 是一种快速离子导体，具有优异的室温体电导率，被涂覆在常见的聚乙烯 (PE) 隔膜上。我们的研究结果表明，这种新型 LLTO 涂层隔膜具有优异的电解质润湿性和热稳定性；组装的NCM523/石墨锂离子软包电池具有LLTO涂层隔膜，表现出更好的倍率性能和88倍的循环性能。₂ O ₃涂层隔膜。快速离子导体陶瓷复合隔膜将成为下一代高性能锂离子动力电池新型隔膜的潜在竞争对手。