Polymer binder plays a critical role in controlling the microstructure of electrode composites. Compared to synthesizing new binder molecules, polymer blends combining the advantages of different polymers represent a low‐cost, facile, and effective strategy for the design of advanced binder systems. In this study, we aim to improve the poly(vinylidene fluoride) (PVDF) binder performance by blending with other functional polymers, including polyethylene‐block‐poly(ethylene glycol) (PE‐PEG) co‐polymer and poly(propylene carbonates) (PPCs). It is found that the PE‐PEG co‐polymer acting as a surfactant for carbon black (CB) can improve the dispersion of CB and, thus, result in a more uniform conductive network in the electrode composites. The addition of PPC, an amorphous polymer with good affinity to liquid electrolytes, can reduce the crystallinity of PVDF and improve the component interactions. Benefiting from the improved structure uniformity, the specific capacity and C‐rate performance of the resultant electrodes were notably improved, as compared with that of pure PVDF binder. These results indicate that polymer blending is a facile method to modify the PVDF binder and improve the uniformity and interfaces of electrode composites.

中文翻译：

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聚偏二氟乙烯基混合物作为锂离子电池的新粘合剂

聚合物粘合剂在控制电极复合材料的微观结构中起着至关重要的作用。与合成新的粘合剂分子相比，结合了不同聚合物优势的聚合物共混物是设计先进粘合剂系统的低成本，便捷且有效的策略。在这项研究中，我们旨在通过与其他功能性聚合物（包括聚乙烯嵌段聚乙二醇（PE-PEG）共聚物和聚碳酸丙烯酯）共混来改善聚偏二氟乙烯（PVDF）粘合剂的性能。 （PPC）。已发现，PE-PEG共聚物可作为炭黑（CB）的表面活性剂，可以改善CB的分散性，从而在电极复合材料中产生更均匀的导电网络。加入PPC，这是一种对液体电解质具有良好亲和力的无定形聚合物，可以降低PVDF的结晶度并改善组件之间的相互作用。与纯PVDF粘合剂相比，得益于改进的结构均匀性，所得电极的比容量和C速率性能得到了显着改善。这些结果表明，聚合物共混是改性PVDF粘合剂并改善电极复合材料均匀性和界面的简便方法。