A phase diagram-guided rational design was introduced to fabricate polymer composite electrolyte, avoiding Edisonian investigations in searching for a polymer electrolyte with high ionic conductivity. The free-standing, flexible, dual-salt-based polymer electrolyte films with superionic conductivity (1.0 mS/cm) at 30°C have been demonstrated. The synergistic effect of salts gave the dual-salt polymer electrolyte outstanding electrochemical stability with a wide electrochemical window of 0–4.5 V (versus Li/Li⁺). The lithium stripping/plating experiments indicated that the polymer electrolyte could be safely cycled under current density from 0.05 to 0.5 mA/cm². The dual-salt polymer electrolyte-based cells exhibited excellent average coulombic efficiency of ∼99.99% in the first 370 cycles. The initial capacity at 30°C is 138 mAh/g (0.2 C), which is close to the value achieved by liquid-electrolyte-based cells under similar condition. The capacity retention is 86% after 370 cycles, indicating the long-term stability of the polymer electrolyte.

采用相图指导的合理设计来制造聚合物复合电解质，从而避免了爱迪生主义在寻找具有高离子电导率的聚合物电解质方面的研究。已经证明了在30°C时具有超离子电导率（1.0 mS / cm）的自支撑，柔性，双盐基聚合物电解质膜。盐的协同作用使双盐聚合物电解质具有出色的电化学稳定性，电化学窗口范围为0-4.5 V（相对于Li / Li ⁺）。锂剥离/镀覆实验表明，该聚合物电解质可以在0.05至0.5 mA / cm ^2的电流密度下安全地循环。基于双盐聚合物电解质的电池在前370个循环中表现出约99.99％的出色平均库仑效率。30°C时的初始容量为138 mAh / g（0.2 C），接近于类似条件下基于液体电解质的电池所达到的值。370次循环后容量保持率为86％，表明聚合物电解质的长期稳定性。