Solvent-free P(EO)20LiTFSI + PYR14TFSI polymer electrolyte films with PYR14+/Li+mole ratios ranging from 0.96 to 3.22 were prepared by hot-pressing mixtures composed of PEO, LiTFSI and PYR14TFSI of selected stoichiometries. The PYR14TFSI room temperature ionic liquid (RTIL) is homogeneously incorporated into the P(EO)20LiTFSI membrane without phase separation. For a PYR14+/Li+mole ratio of 3.22, the ionic conductivity was about 2 × 10-4S/cm at 20 °C, i.e., more than one order of magnitude higher than that of the RTIL-free electrolyte. The electrochemical stability window of the polymer electrolyte containing the RTIL was about 6 V (versus Ag/Ag+). Li/V2O5cells with the polymer electrolyte (PYR14+/Li+= 1.92) showed a 60% capacity retention after 80 cycles at 40 °C (the initial capacity was 210 mA h/g). Li/V2O5cells (PYR14+/Li+= 1.28) held at 30 °C delivered about 93 mA h/g (at 0.057 mA/cm2), which corresponds to approximately 34% utilization of the active material. These results suggest that the incorporation of the RTILs into PEO-based polymer electrolytes is very promising for the future realization of solid-state lithium metal polymer batteries operating near ambient temperatures. © 2005 Elsevier Ltd. All rights reserved.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
Shin, J-H., Henderson, W. A., Appetecchi, G. B., Alessandrini, F., & Passerini, S. (2005). Recent developments in the ENEA lithium metal battery project. Electrochimica Acta, 50(19), 3859 - 3865. https://doi.org/10.1016/j.electacta.2005.02.049