The mechanism of lithium ion transport in polyacrylonitrile-based polymer electrolytes

✍ Scribed by Biying Huang; Zhaoxiang Wang; Liquan Chen; Rongjian Xue; Fosong Wang

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 430 KB
• Volume: 91
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)83030-x

✦ Synopsis

A dozen polyacrylonitrile (PAN)-based polymer electrolytes containing various plasticizers, have shown ionic conductivities higher than 1 X lo-' S cm-' at room temperature. In order to explain the high ionic conduction in these systems, X-ray diffraction (XRD), nuclear magnetic resonance (NMR), Raman scattering and infrared (IR) spectra have been measured systematically. Based on these results, a mechanism of Li' ran transport in PAN-based polymer electrolytes has been suggested. There are three kinds of Li' ions: one in the gel state of PAN, the other in solid PAN and the third in the plasticizer. The high ionic conduction is mainly caused by the Li' ions in the gel state. These Li' ions are coupled with the C=N group in PAN and the C=O group in the plasticizer. The Li' ions can jump from one position to the next along a chain, while moving together with the chain.