Application of lithium nonafluoro-1-butane sulfonate (nonaflate) based non-aqueous liquid electrolytes (NALE) in lithium-ion batteries

The non-aqueous electrolyte system comprising of the lithium nonafluoro-1-butane sulfonate (LiNfO) as a potential lithium ion-conducting salt in an equivalent binary mixture of propylene carbonate (PC) and 1, 2-dimethoxyethane (DME) as the solvent was explored for the lithium battery applications. The LiNfO based non-aqueous liquid electrolyte (NALE) system showed the highest ionic conductivity of 2.66 x 10-3 S cm-1 at ambient temperature, and a potential window stability of ~5 V. The lithium ion cells, Li/NALE//LiCoO2 werefabricated with the proposed non-aqueous electrolyte. The cell with particular composition of electrolyte delivered a high specific discharge capacity of 154 mA h g-1 at ambient temperature. The potential advantages of the proposed NALE are discussed in detail

Temperature-Dependent Raman Spectroscopy of Lithium Triflate−PEO Complexes: Phase Equilibrium and Component Interactions

International audiencePoly(ethylene oxide) and complexes of lithium trifluorosulfonate−poly(ethylene oxide) (LiTf−PEO) with 4 ≤ O/Li ≤ 18 have been studied by Raman spectroscopy from room temperature up to 160 °C. The Raman spectrum of the (PEO)3LiTf defined compound has been deduced from the experimental data. Subtraction of the Raman spectrum due to (PEO)3LiTf in each sample allowed us to determine for the first time the composition and the Li+−Tf− and Li+−PEO interactions in the part of the polymer not crystallized as (PEO)3LiTf. It is shown that the local interactions between cation and anion or between cation and PEO chain persist even in the melted state, up to near the liquidus temperature. In particular, the Li+−PEO interactions decrease significantly just below the liquidus temperature with a simultaneous strong increase in the ion pair concentration