Binders play a crucial role in maintaining mechanical integrity of electrodes in lithium‐ion batteries. However, the conventional binders lack proper elasticity, and they are not suitable for high‐performance silicon anodes featuring huge volume change during cycling. Herein, a poly(siloxane imide) copolymer (PSI) has been designed, synthesized, and utilized as a binder for silicon‐based anodes. A rigidness/softness coupling mechanism is demonstrated by the PSI binder, which can accommodate volume expansion of the silicon anode upon lithiation. The electrochemical performance in terms of cyclic stability and rate capability can be effectively improved with the PSI binder as demonstrated by a silicon nanoparticle anode.

中文翻译：

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硅烷基锂离子电池阳极通过刚度/柔软度耦合的聚（硅氧烷酰亚胺）粘合剂。

粘合剂在维持锂离子电池电极的机械完整性方面起着至关重要的作用。但是，传统的粘合剂缺乏适当的弹性，因此不适用于循环过程中体积变化巨大的高性能硅阳极。本文中，已设计，合成并使用了聚（硅氧烷酰亚胺）共聚物（PSI）作为硅基阳极的粘合剂。PSI粘合剂展示了一种刚度/软度耦合机制，该机制可以适应锂化时硅阳极的体积膨胀。如硅纳米粒子阳极所证明的那样，利用PSI粘合剂可以有效地改善循环稳定性和速率能力方面的电化学性能。