Replacing flammable liquid electrolytes with solid polymer electrolytes is a promising route to improve safety of lithium (Li)-metal batteries. However, developing a suitable high-performance electrolyte with both high ionic conductivity and interface stability against electrodes remains as a challenge. Herein, we design a poly(propylene carbonate) (PPC)/poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)]–based asymmetric solid electrolyte with a 3D blow-spun Li₇La₃Zr₂O₁₂ (LLZO) framework. The controllable degradation of PPC facilitates the wettability and stability between the electrolyte and Li metal. The P(VDF-HFP) with good electrochemical stability is used to match with cathode. With the support of the 3D LLZO Li-ion conductor, the electrolyte displays high ionic conductivity (4.9 × 10⁻⁴ S cm⁻¹ at room temperature). The Li||Li symmetric cells assembled with this electrolyte show a long cycling life of more than 2700 h at 100 μA cm⁻². The electrolyte also delivers an excellent cycling performance in solid-state LiFePO₄||Li batteries (300 cycles with a capacity retention of 91.3%).

用固体聚合物电解质代替易燃液体电解质是提高锂（Li）金属电池安全性的一种有前途的途径。然而，开发具有高离子电导率和针对电极的界面稳定性的合适的高性能电解质仍然是挑战。在此，我们设计了一种具有3D吹纺Li ₇ La ₃ Zr ₂ O ₁₂的聚碳酸亚丙酯/聚偏二氟乙烯-六氟丙烯[P（VDF-HFP）]基不对称固体电解质。（LLZO）框架。PPC的可控降解​​促进了电解质与Li金属之间的润湿性和稳定性。具有良好电化学稳定性的P（VDF-HFP）用于与阴极匹配。在3D LLZO锂离子导体的支撑下，电解质显示出高离子电导率（室温下为4.9×10 ^-4  S cm ^-1）。组装有该电解质的Li || Li对称电池在100μAcm ^-2下显示出超过2700 h的长循环寿命。在固态LiFePO ₄ || Li电池中，该电解质还具有出色的循环性能（300次循环，容量保持率为91.3％）。