In this study, we develop a new Li-metal battery design merging with IoT requirements, mainly the low thickness, the thermal stability and the flexibility. To reach these specifications, we firstly prepared an efficient gel polymer electrolyte (GPE) composed of a PVDF-HFP polymer network, a LiFSI: Pyr₁₃FSI liquid binary solution and a lithium montmorillonite Li-MMT clay. The as-synthesized material exhibits a high ionic conductivity (0.48 mS cm⁻¹ at 25 °C) and a good thermal stability, up to 140 °C. In parallel, a new battery design with an optimized ratio of packaging to active material thickness is developed. In this design, copper foils act both as current collector and as battery casing, decreasing the overall cell thickness. Li metal batteries are realized using the developed GPE material and this new battery design. The cell thickness is 360 and 760 μm for single side and double-sided architectures respectively. These batteries show well functioning under high bending and exhibit a good cycling ability with a remaining capacity higher than 85% after more than 200 cycles at 25 °C. Thanks to the combination of the original Cu packaging and the flexible GPE membrane, developed Li-metal batteries exhibit promising properties to merge with the new IoT requirements.

在这项研究中，我们开发了一种新的锂金属电池设计，并结合了物联网的要求，主要是低厚度，热稳定性和灵活性。为了达到这些规格，我们首先制备了一种高效的凝胶聚合物电解质（GPE），该电解质由PVDF-HFP聚合物网络，LiFSI：Pyr ₁₃ FSI液态二元溶液和锂蒙脱石Li-MMT粘土组成。合成后的材料具有高离子电导率（0.48 mS cm ^-1在25°C下）和良好的热稳定性，最高可达140°C。同时，开发了一种具有最佳包装与活性材料厚度比的新型电池设计。在这种设计中，铜箔既可以充当集电器，又可以充当电池外壳，从而减小了整体电池厚度。锂金属电池是使用开发的GPE材料和这种新电池设计实现的。单面和双面架构的单元厚度分别为360和760μm。这些电池在高弯曲度下表现出良好的功能，并显示出良好的循环能力，在25°C下经过200次循环后，其剩余容量高于85％。得益于原始铜包装和柔性GPE膜的结合，开发出的锂金属电池具有可与新的IoT要求融合的良好性能。