کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
183633 | 459555 | 2015 | 7 صفحه PDF | دانلود رایگان |

• A quaternary PEC-LiTFSI-Pyr14TFSI-Silica fiber electrolyte was prepared by a solvent casting method.
• Both electrochemical and mechanical properties were improved by the presence of the Silica fiber.
• The electrolyte showed a tLi+ value of 0.36 with an anodic stability extended up to 4.5 V vs. Li/Li+.
• A prototype Li/LiFePO4 polymer cell delivered a discharge capacity of about 100 mAh g−1 (75 °C, C/15).
Poly(ethylene carbonate) (PEC) is known as an alternating copolymer derived from carbon dioxide (CO2) and an epoxide as monomers. Here, we describe a new quaternary PEC-based composite electrolyte containing lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) salt, N-n-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (Pyr14TFSI) ionic liquid, and an electrospun silica (SiO2) fiber (SiF) with a submicron diameter in view of its possible applications in solid-state Li polymer batteries. A free-standing electrolyte membrane is prepared by a solvent casting method. The Pyr14TFSI ionic liquid enhances the ionic conductivity of the electrolyte as a result of its plasticizing effect. The electrochemical properties, such as ionic conductivity and Li transference number (tLi+), as well as mechanical strength of the electrolyte, are further improved by the SiF. We show that the quaternary electrolyte has a conductivity of the order of 10−7 S cm−1 at ambient temperature and a high tLi+ value of 0.36 with an excellent flexibility. A prototype Li polymer cell using LiFePO4 as a cathode material is assembled and tested. We demonstrate that this battery delivers a reversible charge-discharge capacity close to 100 mAh g−1 at 75 °C and C/15 rate. We believe that this work may pave the road to utilize CO2 as a carbon source for highly-demanded, functional battery materials in future.
Journal: Electrochimica Acta - Volume 175, 1 September 2015, Pages 134–140