Abstract Lithium metal is a promising anode candidate for the next-generation higher energy density batteries. In this work, a detailed study is carried out to clearly explore the influence of separator wettability on ionic conduction and interface properties for lithium-metal anode batteries. Firstly, polyphenol and polyamine are facilely assembled on the surface of polyethylene (PE) separator with the assistant of periodate. Wettability and electrolyte uptake of the polyphenol-polyamine treated PE separator improves significantly, which resulted in the increase of ionic conductivity and lithium-ion transference number (from 0.37 to 0.49). Subsequently, galvanostatic measurements and electrochemical impedance spectra (EIS) are performed on Li symmetric cells to investigate the effect of separator wettability on interface properties. It is found that the modified PE separator favors the electrochemical process by providing lower interfacial resistance, better interface compatibility, and more uniform deposition of Li+, which correspondingly mitigate the formation of Li dendrites. Finally, lithium-metal anode cells (LiCoO2 (LCO)/Li) assembled with different separators are tested, and superior battery performance is displayed in case of the polyphenol-polyamine treated substrate. These results are expected to be instructive for the design of more durable Li electrodes.

中文翻译：

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多酚-多胺处理聚乙烯隔膜对锂金属负极电池离子传导和界面性能的影响

摘要 锂金属是下一代更高能量密度电池的有前途的负极候选材料。在这项工作中，进行了详细的研究，以明确探索隔膜润湿性对锂金属负极电池离子传导和界面性能的影响。首先，多酚和多胺在高碘酸盐的辅助下很容易地组装在聚乙烯（PE）隔膜表面。多酚-多胺处理的PE隔膜的润湿性和电解质吸收显着改善，导致离子电导率和锂离子转移数增加（从0.37到0.49）。随后，对锂对称电池进行恒电流测量和电化学阻抗谱 (EIS)，以研究隔膜润湿性对界面特性的影响。发现改性 PE 隔膜通过提供更低的界面电阻、更好的界面兼容性和更均匀的 Li+ 沉积有利于电化学过程，这相应地减少了锂枝晶的形成。最后，测试了与不同隔膜组装在一起的锂金属负极电池（LiCoO2（LCO）/Li），并且在多酚-多胺处理的基材的情况下显示出优异的电池性能。预计这些结果对设计更耐用的锂电极具有指导意义。测试了与不同隔膜组装在一起的锂金属负极电池（LiCoO2（LCO）/Li），并且在多酚-多胺处理的基材的情况下显示出优异的电池性能。预计这些结果对设计更耐用的锂电极具有指导意义。测试了与不同隔膜组装在一起的锂金属负极电池（LiCoO2（LCO）/Li），并且在多酚-多胺处理的基材的情况下显示出优异的电池性能。预计这些结果对设计更耐用的锂电极具有指导意义。