Jeong You Kyeong, Choi Jang Wook
School of Chemical and Biological Engineering and Institute of Chemical Processes , Seoul National University , 1 Gwanak-ro , Gwanak-gu, Seoul 08826 , Republic of Korea.
ACS Nano. 2019 Jul 23;13(7):8364-8373. doi: 10.1021/acsnano.9b03837. Epub 2019 Jul 3.
Polymers with supramolecular functionality are receiving increasing attention for rechargeable battery binders as strong supramolecular interactions can facilitate self-healing effects bond recovery of the cleaved cross-links. Such self-healing capability is useful for emerging high-capacity battery materials that undergo large volume changes. Benchmarking mussel's sticky byssus cuticle, herein we report a copolymer binder with Fe-(tris)catechol coordination cross-links, which can induce a self-healing effect for silicon anodes. The high strength of the Fe-(tris)catechol coordination bond can lead to recovery of the dissociated bond that occurs from the large volume expansion of silicon. The given copolymer also contains monomer units with sufficient flexibility to increase the interchain motions for efficient Fe-(tris)catechol bond recovery. The superior electrochemical performance of the Si electrodes based on the proposed copolymer binder indicates that metallopolymers which utilize metal-organic ligand coordination for interchain cross-linking are promising binders with self-healing effects for sustainable cycling of high capacity battery electrodes.
具有超分子功能的聚合物作为可充电电池粘合剂正受到越来越多的关注，因为强大的超分子相互作用可促进自愈合效应，即断裂交联键的键恢复。这种自愈合能力对于经历大体积变化的新兴高容量电池材料很有用。以贻贝粘性的足丝角质层为基准，我们在此报告一种具有铁 -（三）儿茶酚配位交联的共聚物粘合剂，它可对硅阳极产生自愈合效应。铁 -（三）儿茶酚配位键的高强度可导致因硅的大体积膨胀而解离的键恢复。给定的共聚物还包含具有足够柔韧性的单体单元，以增加链间运动，实现高效的铁 -（三）儿茶酚键恢复。基于所提出的共聚物粘合剂的硅电极具有优异的电化学性能，这表明利用金属 - 有机配体配位进行链间交联的金属聚合物是具有自愈合效应的有前途的粘合剂，可实现高容量电池电极的可持续循环。
