The quasi-solid electrolyte based on Poly(vinylidene fluoride-co-hexafluoropropylene) has drawn great interest owing to good wettability and compatibility with lithium metal anode. However, the low ionic conductivity and lithium-ion transfer number limit the practical application of Poly(vinylidene fluoride-co-hexafluoropropylene). Herein, quasi-solid electrolyte is prepared by adding NASICON-type lithium-ion conductor Li_1.3Al_0.3Ti_1.7(PO₄)₃ to Poly(vinylidene fluoride-co-hexafluoropropylene). The Li_1.3Al_0.3Ti_1.7(PO₄)₃ not only reduces the crystallinity of the polymer, but also participates in the conduction process of Li⁺. Through the synergistic effect of Li_1.3Al_0.3Ti_1.7(PO₄)₃ and Poly(vinylidene fluoride-co-hexafluoropropylene), the quasi-solid polymer electrolyte has a high ionic conductivity (3.64 × 10⁻³ S cm⁻¹) at room temperature and large lithium-ion transfer number (0.64). The symmetric cell exhibits a small overpotential (18 mV) as well as a stable cycle (3000 h) at 0.2 mA cm⁻² with areal capacity of 0.2 mAh cm⁻². The full cell with LiFePO₄ cathode keeps a discharge capacity of 143.4 mAh g⁻¹ after 600 cycles with capacity retention of 94.7%, and also performs good electrochemical performance with high voltage cathode (LiNi_0.85Mn_0.1Co_0.05O₂). Furthermore, the pouch cell assembled by quasi-solid polymer electrolyte have good flexibility, which can be used normally after folding and shearing. Our work supplies a feasible solution for the design of quasi-solid lithium metal batteries.

基于聚偏二氟乙烯-共聚六氟丙烯的准固体电解质由于良好的润湿性和与锂金属负极的相容性而引起了极大的兴趣。然而，低离子电导率和锂离子迁移数限制了聚偏二氟乙烯-共聚六氟丙烯的实际应用。在此，准固体电解质通过将NASICON型锂离子导体Li _1.3 Al _0.3 Ti _1.7 (PO ₄ ) ₃添加到聚(偏二氟乙烯-co-六氟丙烯)中来制备。Li _1.3 Al _0.3 Ti _1.7 (PO ₄ ) ₃不仅降低了聚合物的结晶度，还参与了Li ⁺的传导过程。通过Li _1.3 Al _0.3 Ti _1.7 (PO ₄ ) ₃和Poly(偏二氟乙烯-co-六氟丙烯)的协同作用，准固态聚合物电解质具有高离子电导率(3.64×10 ^-3 S cm ^-1 )室温和大的锂离子转移数（0.64）。^{对称电池在 0.2 mA cm -2}时表现出小的过电位 (18 mV) 以及稳定的循环 (3000 h)，面容量为 0.2 mAh cm ^-2。_{含 LiFePO 4}的全电池正极在600次循环后保持143.4 mAh g ^{-1的放电容量，}容量保持率为94.7%，并且在高压正极（LiNi _0.85 Mn _0.1 Co _0.05 O ₂ ）下也表现出良好的电化学性能。此外，由准固态聚合物电解质组装而成的软包电池具有良好的柔韧性，经折叠和剪切后可正常使用。我们的工作为准固态锂金属电池的设计提供了可行的解决方案。