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An Ion-Conductive Grafted Polymeric Binder with Practical Loading for Silicon Anode with High Interfacial Stability in Lithium-Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-06-16 , DOI: 10.1002/aenm.202201197 Zeheng Li 1 , Gu Wu 1 , Yajun Yang 2 , Zhengwei Wan 1 , Xiaoming Zeng 1 , Lijing Yan 3 , Shuxing Wu 2 , Min Ling 1 , Chengdu Liang 1 , Kwun Nam Hui 4 , Zhan Lin 2
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-06-16 , DOI: 10.1002/aenm.202201197 Zeheng Li 1 , Gu Wu 1 , Yajun Yang 2 , Zhengwei Wan 1 , Xiaoming Zeng 1 , Lijing Yan 3 , Shuxing Wu 2 , Min Ling 1 , Chengdu Liang 1 , Kwun Nam Hui 4 , Zhan Lin 2
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Binders are required to dissipate huge mechanical stress and enhance the lithium-ion diffusion kinetics of silicon anodes during cycling. Herein, a stress-distribution binder with high ionic conductivity (GG-g-PAM) is constructed by grating polyacrylamide (PAM) onto ion-conductive guar gum (GG) backbone. The mechanical stress distribution toward the grafted PAM chain enables the effective stress dissipation of the GG-g-PAM binder, and thus maintains a stable electrode-electrolyte interface during cycling. The stress dissipation ability of the GG-g-PAM binder is confirmed by PeakForce atomic force microscopy experiments and finite element simulations. In addition, lithium complexation sites provided by oxygen heteroatoms in GG of the GG-g-PAM binder construct the Li-ion pathways for facilitating Li ionic diffusion in the Si anodes. The good cyclabilities of Ah-level pouch cells based on Si nanoparticle anodes strongly confirm GG-g-PAM as a desirable binder for practical Si anodes.
中文翻译：
一种具有实用负载的离子导电接枝聚合物粘合剂，用于锂离子电池中具有高界面稳定性的硅负极
粘合剂需要在循环过程中消散巨大的机械应力并增强硅阳极的锂离子扩散动力学。在此，通过将聚丙烯酰胺（PAM）光栅化到离子导电瓜尔胶（GG）骨架上，构建了一种具有高离子电导率的应力分布粘合剂（GG-g-PAM）。朝向接枝的 PAM 链的机械应力分布使 GG-g-PAM 粘合剂的有效应力消散，从而在循环过程中保持稳定的电极-电解质界面。PeakForce 原子力显微镜实验和有限元模拟证实了 GG-g-PAM 粘合剂的应力消散能力。此外，GG-g-PAM粘合剂的GG中的氧杂原子提供的锂络合位点构建了锂离子通路，以促进锂离子在硅负极中的扩散。
更新日期：2022-06-16
中文翻译：
一种具有实用负载的离子导电接枝聚合物粘合剂，用于锂离子电池中具有高界面稳定性的硅负极
粘合剂需要在循环过程中消散巨大的机械应力并增强硅阳极的锂离子扩散动力学。在此，通过将聚丙烯酰胺（PAM）光栅化到离子导电瓜尔胶（GG）骨架上，构建了一种具有高离子电导率的应力分布粘合剂（GG-g-PAM）。朝向接枝的 PAM 链的机械应力分布使 GG-g-PAM 粘合剂的有效应力消散，从而在循环过程中保持稳定的电极-电解质界面。PeakForce 原子力显微镜实验和有限元模拟证实了 GG-g-PAM 粘合剂的应力消散能力。此外，GG-g-PAM粘合剂的GG中的氧杂原子提供的锂络合位点构建了锂离子通路，以促进锂离子在硅负极中的扩散。
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