Recent results on aqueous electrolyte cells

Abstract

The improvedsafetyof aqueouselectrolytesmakesaqueous lithium-ionbatteries anattractivealternative to commercial cells utilizingflammable andexpensive organic electrolytes. Two important issues relating to their use have been addressed in this work. One is the extension of the usable voltage range by the incorporation of lithium salts, and the other is the investigation of a useful negative electrode reactant, LiTi2(PO4)3. The electrochemical stability of aqueous lithium salt solutions containing two lithium salts, LiNO3 and Li2SO4, has been characterized using a constant current technique. In both cases, concentrated solutions had effective electrolyte stability windows substantially greater than that of pure water under standard −2 tability of aqueous electrolytes queous cells over 2V conditions. At an electrolyte leakage current of 10 Acm between two platinum electrodes in 5M LiNO3 the cell voltage can reach 2.0V, whereas with a leakage current of 50 Acm−2 it can reach 2.3V. LiTi2(PO4)3 was synthesized using a Pechini method and cycled in pH-neutral Li2SO4. At a reaction potential near the lower limit of electrolyte stability, an initial discharge capacity of 118mAhg−1 was measured at a C/5 rate, while about 90% of this discharge capacity was retained after 100 cycles. This work demonstrates that it is possible to have useful aqueous electrolyte lithium-ion batteries using the ll vol LiTi2(PO4)3 anode with ce

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Cite this paper

@inproceedings{Wessells2010RecentRO, title={Recent results on aqueous electrolyte cells}, author={olin Wessells and Robert A. Huggins and Yi Cui}, year={2010} }