With the rapid development of wearable devices, there is an increasing demand for ultra-safe flexible lithium-ion batteries (LIBs) capable of delivering high energy density. Because it can provide the highest possible capacity of 3860 mAh g^-1, lithium metal has drawn tremendous research attention. However, Li is a highly reactive metal that grows dendrites during the cycling of lithium-metal batteries (LMBs). To resolve the problem, we developed a new non-flammable elastic quasi-solid electrolyte (QSE), which can be polymerized in situ and whose composition is tailored to achieve high elasticity. Moreover, the incorporation of trimethyl phosphate (TMP) renders the electrolyte non-flammable. Thanks to the solid electrolyte interphase (SEI) formed, the LMB with QSE displays excellent cycling stability as it can be operated for 500 cycles, with a capacity retention of 94%. The corresponding symmetric cell cycled stably for more than 500 h. Scanning electron microscopy (SEM) and density functional theory (DFT) calculations reveal that fluoroethylene carbonate (FEC) is critical in forming the LiF-rich SEI that enables long-term cycling stability. In brief, a non-flammable, elastic, and stable QSE is reported for the first time, which is very promising in the application of the next-generation wearable devices.

随着可穿戴设备的快速发展，对能够提供高能量密度的超安全柔性锂离子电池（LIB）的需求日益增长。因为它可以提供3860 mAh g ^-1的最大可能容量，金属锂引起了极大的研究关注。但是，Li是一种高反应性金属，在锂金属电池（LMB）的循环过程中会生长出树枝状晶体。为了解决该问题，我们开发了一种新型的不可燃弹性准固体电解质（QSE），该电解质可以在原位聚合，其成分可以达到高弹性。此外，磷酸三甲酯（TMP）的结合使电解质不可燃。由于形成了固体电解质中间相（SEI），具有QSE的LMB具有出色的循环稳定性，因为它可以运行500个循环，容量保持率达94％。相应的对称细胞稳定循环超过500小时。扫描电子显微镜（SEM）和密度泛函理论（DFT）计算表明，碳酸氟代亚乙酯（FEC）在形成能够实现长期循环稳定性的富LiF SEI方面至关重要。简而言之，首次报道了不易燃，弹性且稳定的QSE，这在下一代可穿戴设备的应用中非常有前途。