Sustainable Materials and Technologies ( IF 9.6 ) Pub Date : 2021-08-26 , DOI: 10.1016/j.susmat.2021.e00333 Zeheng Li 1 , Zhengwei Wan 1 , Gu Wu 1 , Zhuoying Wu 1 , Xiaomin Zeng 1 , Lu Gan 1 , Jie Liu 2 , Shuxing Wu 3 , Zhan Lin 3 , Xuehui Gao 4 , Min Ling 1 , Chengdu Liang 1
Binders play an important role in enhancing the cycling lives of Si anodes. Herein, we propose a new three-dimensional network binder constructed by weaving the dual biopolymers (i.e., κ-carrageenan gum and konjac gum) through the intermolecular interactions. Due to the synergistic effect of κ-carrageenan gum and konjac gum, the proposed binder (N-KCG-KG) demonstrates the enhanced adhesion strength and moderate mechanical properties, which is benefit for accommodating the huge volume change of Si during the repeated deep cycling. As a consequence, a positive long-term cycling performance of 500 cycles at 1 A g−1 is achieved by the Si anode using the N-KCG-KG binder (Si@N-KCG-KG). Moreover, the relatively stable cycling performance of full-cell using the Si@N-KCG-KG anode confirms that the N-KCG-KG binder can work well in the practical cell setting.
中文翻译:
用于锂离子电池硅纳米颗粒阳极中贫粘合剂的生物聚合物网络
粘合剂在提高硅阳极的循环寿命方面起着重要作用。在此,我们提出了一种通过分子间相互作用编织双生物聚合物(即κ-角叉菜胶和魔芋胶)构建的新型三维网络粘合剂。由于κ-角叉菜胶和魔芋胶的协同作用,所提出的粘合剂(N-KCG-KG)表现出增强的粘合强度和适度的机械性能,有利于适应重复深度循环过程中Si的巨大体积变化. 因此,在 1 A g -1下 500 次循环的正长期循环性能是通过使用 N-KCG-KG 粘合剂 (Si@N-KCG-KG) 的 Si 阳极实现的。此外,使用 Si@N-KCG-KG 阳极的全电池相对稳定的循环性能证实了 N-KCG-KG 粘合剂在实际电池设置中可以很好地工作。