Utilizing polymer electrolytes in Li-O₂ batteries could effectively solve safety issues caused by flammable liquid electrolytes. However, the effect of polymer matrixes and additional liquid electrolytes on the cycle performance of Li-O₂ batteries is still not clear. Herein, free-standing, Li-ion conducting ultra-dry polymer electrolytes (UDPEs) without additional liquid electrolytes are synthesized by a simple tape-casting and vacuum-drying method. The long-term cycle performance (over 800 h) of the UDPE-based symmetric Li-Li cells in O₂ atmosphere demonstrates that the UDPEs significantly resist O₂ crossover and Li dendrite penetration. Moreover, side reactions caused by the degradation of liquid electrolytes can be alleviated and a stable LiF-containing solid electrolyte interface is formed between the UDPEs and Li metal. Meanwhile, the cycle life of the UDPE-based catalyst-free Li-O₂ batteries under a high current density of 0.4 mA cm^-2 is improved by more than twofold in comparison with that of the liquid electrolyte-based Li-O₂ batteries. The replacement of liquid electrolytes by UDPEs does not change the fundamental reaction of the solid-state Li-O₂ batteries, which is still the formation and decomposition of typical Li₂O₂ crystals. The outstanding comprehensive performance of UDPEs may trigger further studies towards multifunctional polymer electrolytes in Li-O₂ batteries and even other alkali metal-based O₂ (air) batteries.

在Li-O ₂电池中使用聚合物电解质可以有效解决由易燃液体电解质引起的安全问题。然而，聚合物基体和其他液体电解质对Li-O ₂电池循环性能的影响仍然不清楚。在此，通过简单的流延铸造和真空干燥法合成了没有附加液体电解质的自立式锂离子导电超干聚合物电解质（UDPE）。基于UDPE的对称Li-Li电池在O ₂气氛中的长期循环性能（超过800小时）表明UDPE能够显着抵抗O ₂分频和李枝晶的渗透。此外，可以减轻由液体电解质的降解引起的副反应，并且在UDPE和Li金属之间形成稳定的含LiF的固体电解质界面。同时，与基于液体电解质的Li-O ₂电池相比，在0.4 mA cm ^-2的高电流密度下，基于UDPE的无催化剂Li-O ₂电池的循环寿命提高了两倍以上。。用UDPE代替液体电解质不会改变固态Li-O ₂电池的基本反应，而这仍是典型Li ₂ O ₂的形成和分解。晶体。UDPE的出色综合性能可能会触发对Li-O ₂电池甚至其他基于碱金属的O ₂（空气）电池中的多功能聚合物电解质的进一步研究。