High theoretical specific capacity and the lowest electrochemical potential of Li metal have made it one of the most promising materials for metal anode. Nonetheless, shortened lifespan and even safety issues induced by uncontrollable growth of Li dendrite severely impede the development of lithium metal batteries (LMBs). In this work, a facile and economic strategy is introduced by casting lithiophilic CaTiO₃ micro-particles onto the commercial polyethylene separators. The CaTiO₃ coating could not only enhance the thermal stability of the separator, but also decrease the nucleation overpotential and facilitate homogeneous Li deposition, finally achieving suppression of the Li dendrite. Consequently, with the CaTiO₃-coated separators, the cycling lifespan of Li||Li symmetric cells was remarkably improved to 1500 h in carbonate electrolyte. Moreover, 5 V-class full cells coupled with CaTiO₃-coated separators exhibit prolonged lifespan and superior rate performance, indicating the good potential of the modified separators for application. Considering the fabrication of CaTiO₃-coated separators is completely industry-available, this work could accelerate the proceeding of practical application of high-energy-density lithium metal battery systems.

锂金属的高理论比容量和最低的电化学电位使其成为最有前途的金属负极材料之一。尽管如此，锂枝晶的不可控生长导致的寿命缩短甚至安全问题严重阻碍了锂金属电池（LMB）的发展。在这项工作中，通过将亲锂的 CaTiO ₃微粒浇铸到商业聚乙烯隔膜上，引入了一种简便且经济的策略。CaTiO ₃涂层不仅可以提高隔膜的热稳定性，还可以降低成核过电位，促进锂的均匀沉积，最终实现对锂枝晶的抑制。因此，CaTiO ₃涂覆隔膜后，Li||Li 对称电池在碳酸盐电解质中的循环寿命显着提高至 1500 小时。此外，5 V级全电池与CaTiO ₃涂层隔膜相结合，表现出更长的使用寿命和优异的倍率性能，表明改性隔膜具有良好的应用潜力。考虑到CaTiO ₃涂层隔膜的制备完全可以工业化，这项工作可以加速高能量密度锂金属电池系统的实际应用进程。