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3D Meshlike Polyacrylamide Hydrogel as a Novel Binder System via in situ Polymerization for High‐Performance Si‐Based Electrode
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-12-17 , DOI: 10.1002/admi.201901475 Hyungsub Woo 1 , Kimin Park 1 , Jaewon Kim 1 , Alan Jiwan Yun 1 , Seunghoon Nam 2 , Byungwoo Park 1
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-12-17 , DOI: 10.1002/admi.201901475 Hyungsub Woo 1 , Kimin Park 1 , Jaewon Kim 1 , Alan Jiwan Yun 1 , Seunghoon Nam 2 , Byungwoo Park 1
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Silicon has been considered as a promising anode material due to its high theoretical capacity (3579 mAh g−1), however, it suffers from capacity degradation owing to the series of multiscale fractures in the electrode caused by the volume variation (≈300%) during phase transitions. The molecular/structural design of polymeric binders has been pivotal in overcoming the challenges to improve the integrity of Si anode via strong interactions between active materials and binders. In this respect, the covalently crosslinked polyacrylamide (PAM) network, which effectively maintains its mechanical strength and shape, is introduced as a novel binder system for Si active materials. Unlike the thermal crosslinking, the abundant polar‐functional groups, related to the strong interactions between Si and polymer, are not sacrificed in their network by virtue of the in situ polymerization. Through the PAM gel, the Si‐based electrode exhibits a superior capacity of ≈1526 mAh g−1 at an optimized crosslinker concentration after 500 cycles. In addition, the effect of the chemical/mechanical properties of PAM gel on the electrochemical properties of Si is adequately elucidated. The results will provide meaningful insight regarding the design of novel binders, especially in the application of the covalently crosslinked structure to Si‐based electrodes.
中文翻译：
3D网状聚丙烯酰胺水凝胶作为新型粘合剂系统，通过原位聚合形成高性能的硅基电极
硅由于其高理论容量（3579 mAh g -1）而被认为是有前途的阳极材料），但由于相变期间的体积变化（≈300％）导致电极中发生一系列多尺度断裂，导致容量下降。聚合物粘合剂的分子/结构设计对于克服通过活性材料与粘合剂之间的强相互作用提高Si阳极完整性的挑战至关重要。在这方面，有效地保持其机械强度和形状的共价交联聚丙烯酰胺（PAM）网络被引入作为用于硅活性材料的新型粘合剂体系。与热交联不同，与Si和聚合物之间的强相互作用有关的大量极性官能团不会因原位聚合而牺牲在其网络中。通过PAM凝胶，在500个循环后以最佳的交联剂浓度-1。另外，充分阐明了PAM凝胶的化学/机械性质对Si的电化学性质的影响。结果将为新型粘合剂的设计提供有意义的见解，尤其是在将共价交联结构应用于硅基电极时。
更新日期：2019-12-17
中文翻译：
3D网状聚丙烯酰胺水凝胶作为新型粘合剂系统，通过原位聚合形成高性能的硅基电极
硅由于其高理论容量（3579 mAh g -1）而被认为是有前途的阳极材料），但由于相变期间的体积变化（≈300％）导致电极中发生一系列多尺度断裂，导致容量下降。聚合物粘合剂的分子/结构设计对于克服通过活性材料与粘合剂之间的强相互作用提高Si阳极完整性的挑战至关重要。在这方面，有效地保持其机械强度和形状的共价交联聚丙烯酰胺（PAM）网络被引入作为用于硅活性材料的新型粘合剂体系。与热交联不同，与Si和聚合物之间的强相互作用有关的大量极性官能团不会因原位聚合而牺牲在其网络中。通过PAM凝胶，在500个循环后以最佳的交联剂浓度-1。另外，充分阐明了PAM凝胶的化学/机械性质对Si的电化学性质的影响。结果将为新型粘合剂的设计提供有意义的见解，尤其是在将共价交联结构应用于硅基电极时。
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