Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Chemistry. 2018 Dec 20;24(72):19200-19207. doi: 10.1002/chem.201803943. Epub 2018 Dec 6.
A novel polymer electrolyte with mechanically robust and self-healing properties was fabricated through a dual-network structure, crosslinked by quadruple hydrogen bonding and chemical bonding. The dynamic ureido-pyrimidinone (UPy) dimers were the first network in the polymer matrix. This group endows the polymer electrolyte with good self-healing capacity and improves the reliability and lifetime of the polymer lithium batteries. The crosslinked polyethylene glycol-bis-carbamate dimethacrylate (PEGBCDMA) is the second network and guarantees dimensional stability and good mechanical properties of the polymer electrolyte. The dual-network self-healing polymer electrolyte (DN-SHPE) exhibits improved ionic conductivity versus the polymer electrolyte fabricated by poly(ethylene glycol) diacrylate (PEGDA). It has high thermal stability (up to 350 °C) and excellent interfacial stability with the electrodes. When the DN-SHPE-based cells were fabricated with LiFePO and Li metal, the resulting cells show good reversible specific capacity and considerable rate capability. Moreover, the pouch cell could maintain electrochemical function even under deformation or folding conditions.
通过双重网络结构，利用四重氢键和化学键交联，制备了具有机械强度和自修复性能的新型聚合物电解质。动态脲嘧啶-嘧啶酮（UPy）二聚体是聚合物基体中的第一个网络。该基团赋予聚合物电解质良好的自修复能力，提高了聚合物锂电池的可靠性和寿命。交联的聚乙二醇双碳酸酯二甲基丙烯酸酯（PEGBCDMA）是第二个网络，保证了聚合物电解质的尺寸稳定性和良好的机械性能。双重网络自修复聚合物电解质（DN-SHPE）表现出比由聚乙二醇二丙烯酸酯（PEGDA）制备的聚合物电解质更高的离子电导率。它具有高的热稳定性（高达 350°C）和与电极优异的界面稳定性。当基于 DN-SHPE 的电池与 LiFePO 和 Li 金属一起制造时，得到的电池表现出良好的可逆比容量和相当大的倍率性能。此外，即使在变形或折叠条件下，袋式电池也能保持电化学功能。
