Sorry, you need to enable JavaScript to visit this website.

Recent developments in the ENEA lithium metal battery project

TitleRecent developments in the ENEA lithium metal battery project
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2005
AuthorsShin, J.-H., Henderson W.A., Appetecchi Giovanni Battista, Alessandrini F., and Passerini S.
JournalElectrochimica Acta
KeywordsElectrochemistry, Ionic liquid, Lithium batteries, Lithium battery project, Organic solvents, Phase separation, Plastic films, Polyelectrolytes, Pyrrolidinium, Room temperature ionic liquid (RTIL), TFSI, Thermal effects

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 PYR 14TFSI 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 × 10-4 S/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/V 2O5 cells with the polymer electrolyte (PYR 14+/Li+ = 1.92) showed a 60% capacity retention after 80 cycles at 40 °C (the initial capacity was 210 mA h/g). Li/V 2O5 cells (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.


cited By 91

Citation KeyShin20053859