Abstract The highest specific capacity (3860 mAh g−1) and minimum negative electrochemical potential make lithium metal as a perfect candidate for next-generation high energy battery. However, the safety issue caused by the lithium dendrite growth hinders the practical use of lithium metal battery. Herein, a polymer/polymer-ceramic/polymer sandwich structure electrolytes (SWEs) are proposed to address this problem by combing the advantage of inorganic and gel-type polymer electrolytes. The flexible SWEs show a high ionic conductivity (~3.01 ×10−3 S/cm) at room temperature, high lithium transference number (tLi+ = 0.74), and stable electrochemical widows up to 5.0 V. Furthermore, the SWEs can effectively prevent lithium dendrites in a symmetric Li/SWEs/Li test during charge and discharge with a current density of 1 mA/cm2 for 240 h at room temperature. Meanwhile, the lithium metal battery assembled using LiCoO2/SWEs/Li exhibits the high cycling capacity of ~ 110 mAh g−1 at 2 C over 100 cycles and fascinating rate performance (144 mAh g−1@ 1 C and 98 mAh g−1@ 5 C) at room temperature. Our work provides a new design paradigm to exploit the advanced electrolyte for lithium metal battery and flexible devices.

中文翻译：

---

用于锂金属电池安全、稳定循环的三明治结构聚合物/聚合物-陶瓷/聚合物凝胶电解质

摘要 最高的比容量（3860 mAh g-1）和最小的负电化学势使锂金属成为下一代高能电池的理想选择。然而，锂枝晶生长带来的安全问题阻碍了锂金属电池的实际应用。在此，提出了一种聚合物/聚合物-陶瓷/聚合物夹心结构电解质（SWE），通过结合无机和凝胶型聚合物电解质的优点来解决这个问题。柔性 SWEs 在室温下显示出高离子电导率 (~3.01 ×10−3 S/cm)、高锂转移数 (tLi+ = 0.74) 和高达 5.0 V 的稳定电化学寡。此外，在室温下以 1 mA/cm2 的电流密度充放电 240 小时，SWEs 在对称 Li/SWEs/Li 测试中可以有效地防止锂枝晶。同时，使用 LiCoO2/SWEs/Li 组装的锂金属电池在 2 C 下超过 100 次循环表现出~110 mAh g-1 的高循环容量和令人惊叹的倍率性能（144 mAh g-1@ 1 C 和 98 mAh g-1 @ 5 C) 在室温下。我们的工作为开发用于锂金属电池和柔性设备的先进电解质提供了一种新的设计范例。