Li Chao, Huang Ying, Feng Xuansheng, Zhang Zheng, Gao Heng, Huang Jiaxin
MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, Ministry of Education, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China.
MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions, Ministry of Education, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, PR China.
J Colloid Interface Sci. 2021 Jul 15;594:1-8. doi: 10.1016/j.jcis.2021.02.128. Epub 2021 Mar 9.
This study aims to prepare an organic-inorganic reticular polymer electrolyte. Isocyanate acts as a bridge that connects fumed silica and PEO molecular chains. The PEO-TDI-SiO solid polymer electrolytes developed can significantly have improved ionic conductivity of 0.12 mS cm at ambient temperature. This is because the TDI-SiO nanoparticles inhibits polymer crystallization which provides more continuous Li-ion transport pathways. Tests at 60 °C indicate that the cross-linked structure of covalent TSI bonded to PEO effectively enlarges the electrochemical window of the polymer electrolyte to 5.6 V. Also, the PTSI electrolyte membrane has a higher Li transference number of 0.33 compared to the PEO-LiTFSI electrolytes. It is worth noting that the assembled LiFePO|PTSI8%|Li cells deliver outstanding rate performance and stable cycling performance. All these considerable merits of PTSI membrane demonstrate that PTSI is a promising candidate that can be used as solid polymer electrolytes for the next-generation Li-ion batteries.
本研究旨在制备一种有机-无机网状聚合物电解质。异氰酸酯充当连接气相二氧化硅和聚环氧乙烷（PEO）分子链的桥梁。所开发的PEO-TDI-SiO固体聚合物电解质在室温下可显著提高离子电导率，达到0.12 mS cm 。这是因为TDI-SiO纳米颗粒抑制了聚合物结晶，从而提供了更多连续的锂离子传输路径。在60°C下的测试表明，与PEO键合的共价TSI的交联结构有效地将聚合物电解质的电化学窗口扩大到5.6 V。此外，与PEO-LiTFSI电解质相比，PTSI电解质膜具有更高的锂迁移数，为0.33。值得注意的是，组装的LiFePO|PTSI8%|Li电池具有出色的倍率性能和稳定的循环性能。PTSI膜的所有这些显著优点表明，PTSI是一种有前途的候选材料，可作为下一代锂离子电池的固体聚合物电解质。
