Ma Liujia, Meng Jian-Qiang, Cheng Ya-Jun, Ji Qing, Zuo Xiuxia, Wang Xiaoyan, Zhu Jin, Xia Yonggao
School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin, 300387, People's Republic of China.
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Zhenhai District, Ningbo, Zhejiang Province, 315201, People's Republic of China.
Chem Asian J. 2020 Sep 1;15(17):2674-2680. doi: 10.1002/asia.202000633. Epub 2020 Jul 17.
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.
粘结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。然而，传统粘结剂缺乏适当的弹性，不适用于在循环过程中具有巨大体积变化的高性能硅阳极。在此，设计、合成了一种聚（硅氧烷酰亚胺）共聚物（PSI），并将其用作硅基阳极的粘结剂。PSI粘结剂展示了一种刚柔耦合机制，它能够在锂化时适应硅阳极的体积膨胀。如硅纳米颗粒阳极所示，使用PSI粘结剂可有效提高循环稳定性和倍率性能方面的电化学性能。
