A self‐healing polymer (SHP) with abundant hydrogen bonds, appropriate viscoelasticity, and stretchability is a promising binder to improve cycle performance of Si microparticle anodes in lithium (Li) ion batteries. Besides high capacity and long cycle life, efficient rate performance is strongly desirable for practical Si anode implementation. Here, polyethylene glycol (PEG) groups are incorporated into the SHP, facilitating Li ionic conduction within the binder. The concept of the SHP‐PEG binder involves improving the interface between Si microparticles and electrolytes after cycling based on the combination of self‐healing ability and fast Li ionic conduction. Through the systematic study of mixing PEG Mw and ratio, the polymeric binder combining SHP and PEG with M_w 750 in an optimal ratio of 60:40 (mol%) achieves a high discharging capacity of ≈2600 mA h g⁻¹, reasonable rate performance especially when >1C and maintains 80% of their initial capacity even after ≈150 cycles at 0.5C. The described concept for the polymeric binder, embedding both self‐healing ability and high Li ionic conductivity, should be equally useful for next generation batteries utilizing high capacity materials which suffer from huge volume change during cycling.

中文翻译：

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锂离子电池中低成本Si微粒阳极的离子导电自修复粘合剂

具有丰富氢键，适当的粘弹性和可拉伸性的自修复聚合物（SHP）是改善锂（Li）离子电池中Si微粒阳极循环性能的有前途的粘合剂。除了高容量和长循环寿命外，高效的倍率性能对于实际的硅阳极实施也是非常需要的。在此，将聚乙二醇（PEG）基团结合到SHP中，以促进粘合剂内的Li离子传导。SHP-PEG粘合剂的概念涉及在循环后基于自我修复能力和快速锂离子传导的结合，改善硅微粒与电解质之间的界面。通过混合PEG Mw和比率，聚合物粘合剂SHP和PEG相结合的系统研究中号_瓦特750的最佳比例为60:40（mol％），可实现≈2600mA hg ^-1的高放电容量，具有合理的速率性能，尤其是在> 1C的情况下，即使在0.5C的≈150次循环后仍可保持其初始容量的80％。聚合物粘合剂的概念既具有自我修复能力，又具有高锂离子电导率，对于使用容量大，循环中体积变化大的高容量材料的下一代电池也同样有用。