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Room Temperature Molten Salts (Ionic Liquids) as Electrolytes in Rechargeable Lithium Batteries
Technical Paper
1999-01-1403
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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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Citation
Caja, J., Don, T., Dunstan, J., Katovic, V. et al., "Room Temperature Molten Salts (Ionic Liquids) as Electrolytes in Rechargeable Lithium Batteries," SAE Technical Paper 1999-01-1403, 1999, https://doi.org/10.4271/1999-01-1403.Also In
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