A flexible composite solid electrolyte membrane consisting of inorganic solid particles (Li_1.3Al_0.3Ti_1.7(PO₄)₃), polyethylene oxide (PEO), and boronized polyethylene glycol (BPEG) is prepared and investigated. This membrane exhibits good stability against lithium dendrite, which can be attributed to its well‐designed combination components: the compact inorganic lithium ion conducting layer provides the membrane with good mechanical strength and physically barricades the free growth of lithium dendrite; while the addition of planar BPEG oligomers not only disorganizes the crystallinity of the PEO domain, leading to good ionic conductivity, but also facilitates a “soft contact” between interfaces, which not only chemically enables homogeneous lithium plating/stripping on the lithium metal anode, but also reduces the polarization effects. In addition, by employing this membrane to a LiFePO₄/Li cell and testing its galvanostatic cycling performances at 60 °C, capacities of 158.2 and 94.2 mA h g⁻¹ are delivered at 0.1 C and 2 C, respectively.

中文翻译：

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柔性复合固体电解质，可为固态锂离子电池提供高度稳定的“软接触”锂电解质界面

由无机固体颗粒（Li _1.3 Al _0.3 Ti _1.7（PO ₄）₃组成的柔性复合固体电解质膜），聚环氧乙烷（PEO）和硼化聚乙二醇（BPEG）的制备和研究。这种膜对锂枝晶表现出良好的稳定性，这归因于其精心设计的组合成分：致密的无机锂离子导电层为膜提供了良好的机械强度，并在物理上阻碍了锂枝晶的自由生长；而添加平面BPEG低聚物不仅会破坏PEO域的结晶度，导致良好的离子导电性，而且还促进了界面之间的“软接触”，这不仅化学上使锂金属阳极上的锂镀覆/剥离均匀，而且还减少了极化效应。另外，通过将该膜用于LiFePO ₄/ Li电池并在60°C下测试其恒电流循环性能，分别在0.1 C和2 C下提供158.2和94.2 mA hg ^-1的容量。