Competition between the plasticizer and polymer on associating with Li{sup +} ions in polyacrylonitrile-based electrolytes
- Chinese Academy of Sciences, Beijing (China)
The Raman and infrared spectra of the systems of plasticizer/LiClO{sub 4} and plasticizer/polyacrylonitrile (PAN)/LiClO{sub 4} have been recorded, where the plasticizer includes dimethylformamide (DMF) and propylene carbonate (PC). By comparing the spectra, it is found that the association of Li{sup +} ion is more competitive with DMF than with PC in the liquid or gel electrolytes. Moreover, the addition of PAN into DMF/LiClO{sub 4} solution has less influence on the Li{sup +}-solvent association than into PC/LiClO{sub 4} solution. Although a strong interaction has been observed between Li{sup +} ions and PAN in PC/LiClO{sub 4}/PAN electrolytes, no similar interaction is observed between Li{sup +} ion and PAN in DMF/PAN/LiClO{sub 4} system. However, after the plasticizer is removed from the gel electrolytes, apparent interaction is observed between Li{sup +} ion and PAN. These phenomena lead to a conclusion that there is a competition between the plasticizer and the polymer for association with the Li{sup +} ions in the PAN-based electrolytes. In addition, it is found that the multiple ion aggregates are formed without the appearance of the usual solvent-shared ion aggregates in the plasticizer-free electrolyte, which suggests that the Li{sup +} ions may move both in the gel state and with the segmental chain of PAN while the ClO{sub 4}{sup {minus}} anion migrates mainly in the gel state in a practical PAN-based electrolyte.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 483774
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 3 Vol. 144; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Polyacrylonitrile-based electrolytes: How processing and residual solvent affect ion transport and stability
A vibrational spectroscopic study on the interaction between lithium salt and ethylene carbonate plasticizer for PAN-based electrolytes