Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6612750 | Electrochimica Acta | 2014 | 7 Pages |
Abstract
Electrospun polymer nanofibrous mats loaded with ionic liquids (ILs) and lithium salts are promising non-volatile electrolytes owing to their high ionic conductivities. However, the large cations of ILs are difficult to diffuse into solid electrodes, whereas the lithium ions in ILs tend to form anionic complexes with the IL anions, reducing the number of free lithium ions. To address these issues, octa(3-hydroxy-3-methylbutyldimethylsiloxy) polyhedral oligomeric silsesquioxane (POSS-OH), which has large specific surface area and functionality number, is incorporated into electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) nanofibrous mats, and the mats are used to host LiClO4/1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF4â). It is found that POSS-OH can significantly increase both ionic conductivity and lithium transference number of the electrolytes owing to the Lewis acid-base interactions of POSS-OH with ClO4â and BF4â. The electrochromic device using the hybrid mat (with 5 wt% POSS-OH) loaded with LiClO4/BMIM+BF4â as the electrolyte shows significantly improved transmittance contrast and switching time, as a result of increased number of free lithium ions.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Rui Zhou, Kumari Pallathadka Pramoda, Wanshuang Liu, Dan Zhou, Guoqiang Ding, Chaobin He, Yew Wei Leong, Xuehong Lu,