Walker Catherine N, Versek Craig, Touminen Mark, Tew Gregory N
Department of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States.
Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, United States.
ACS Macro Lett. 2012 Jun 19;1(6):737-741. doi: 10.1021/mz300090m. Epub 2012 May 31.
End-functionalized poly(ethylene glycol) (PEG) and polydimethylsiloxane (PDMS) were cross-linked by a thiolene reaction with a tetra-functional thiol to create robust, tunable networks. These networks were loaded with increasing amounts of lithium bis(trifluoromethane sulfonyl imide) (LiTFSI), and their ion conductivity was measured. A wide range of salt loading was achieved, allowing the investigation of both salt-in-polymer and polymer-in-salt regimes. Thermal, mechanical, and ion conductivity properties of LiTFSI-loaded PEG and PEG-PDMS networks were measured. Even at high salt loadings, both networks maintained rubber-like characteristics, which were stable over a range of temperatures (30-90 °C). The PEG network with the highest salt loading showed the greatest ion conductivity, 6.7 × 10 S cm at 30 °C, as measured by impedance spectroscopy. This system provides a route to optimize lithium ion conduction and mechanical properties.
末端功能化的聚乙二醇（PEG）和聚二甲基硅氧烷（PDMS）通过与四官能硫醇的硫醇-烯反应交联，形成坚固且可调的网络。这些网络负载了越来越多的双（三氟甲烷磺酰亚胺）锂（LiTFSI），并测量了它们的离子电导率。实现了广泛的盐负载量，从而能够研究盐在聚合物中和聚合物在盐中的两种体系。测量了负载LiTFSI的PEG和PEG-PDMS网络的热性能、机械性能和离子电导率性能。即使在高盐负载量下，两种网络都保持类似橡胶的特性，在一系列温度（30-90°C）范围内稳定。通过阻抗谱测量，盐负载量最高的PEG网络在30°C时显示出最大的离子电导率，为6.7×10 S/cm。该系统为优化锂离子传导和机械性能提供了一条途径。
