Enoki Tomoya, Kosono Ryuta, Zainuddin Nurul Amira Shazwani, Uno Takahiro, Kubo Masataka
Division of Applied Chemistry, Graduate School of Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu 514-8507, Japan.
Molecules. 2025 Jul 30;30(15):3201. doi: 10.3390/molecules30153201.
Polyethylene oxide (PEO) is the most well-studied polymer used in solid polymer electrolytes (SPEs) for lithium ion batteries (Li-ion batteries). However, ionic conductivity is greatly reduced in the low temperature range due to the crystallization of PEO. Therefore, methods to suppress the crystallization of PEO at room temperature by cross-linking or introducing a branched structure are currently being investigated. In this study, we synthesized new comb-type ion-conducting polyethers with two different side chains such as polydimethylsiloxane (PDMS) and polyethylene glycol monomethyl ether (mPEG) segments as flexible and ion-conducting segments, respectively. The introduction of the PDMS segment was found to prevent a decrease in ionic conductivity in the low-temperature region, but led to an ionic conductivity decrease in the high temperature region. On the other hand, the introduction of mPEG segments improved ionic conductivity in the high-temperature region. The introduction of mPEG segments with longer chains resulted in a significant decrease in ionic conductivity in the low-temperature region.
聚环氧乙烷（PEO）是用于锂离子电池（Li-ion电池）的固体聚合物电解质（SPEs）中研究最为深入的聚合物。然而，由于PEO的结晶，在低温范围内离子电导率会大幅降低。因此，目前正在研究通过交联或引入支化结构来抑制PEO在室温下结晶的方法。在本研究中，我们合成了具有两种不同侧链的新型梳型离子导电聚醚，分别是聚二甲基硅氧烷（PDMS）和聚乙二醇单甲醚（mPEG）链段，它们分别作为柔性和离子导电链段。发现引入PDMS链段可防止低温区域离子电导率下降，但导致高温区域离子电导率降低。另一方面，引入mPEG链段提高了高温区域的离子电导率。引入较长链的mPEG链段导致低温区域离子电导率显著降低。
