Molten salts are ionic, nonflammable, nonvolatile liquids with high ionic conductivity, oxidation voltage greater than 5 V vs. Li and high thermal stability (>300°C). So far the application of molten salts in batteries has been limited to those operating at relatively high temperature (>150°C). Rechargeable lithium-ion and lithium batteries have attained wide acceptance in both commercial and military applications. However, most of the solvents used in these cells are volatile and flammable; hence, they represent a significant safety hazard, especially, when operated at higher temperatures. Therefore the application of molten salts as electrolytes in lithium and lithium-ion cells containing LiMn2O4 (cathode) was investigated. The preliminary results show that rechargeable lithium and lithium-ion cells can be constructed and operated using molten salts as electrolytes. Test cells were cycled at ambient temperature and at higher temperature (55°C). They were cathode limited and their capacities ranged from 0.6 to 2 mAh. The open circuit voltage of charged cell was 4.2 V. Charge/discharge efficiencies were high (80%). However, the cells showed an increase of cell resistance with cycling which decreased the charge capacity (voltage limited) and efficient utilization of the cell capacity.


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    Title :

    Room Temperature Molten Salts (Ionic Liquids) as Electrolytes in Rechargeable Lithium Batteries


    Additional title:

    Sae Technical Papers


    Contributors:
    Ryan, David M. (author) / Dunstan, J. (author) / Caja, Josip (author) / Don, T. (author) / Katovic, Vladimir (author)

    Conference:

    Aerospace Power Systems Conference ; 1999



    Publication date :

    1999-04-06




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English