کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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190711 | 459705 | 2010 | 5 صفحه PDF | دانلود رایگان |

In this work we have explored the electrochemical properties of two lithiated iron oxide powders for supercapacitor purposes. These samples mainly consisted of α-LiFeO2 in nanosized or micrometric form. Electrolyte was an aqueous 0.5 M Li2SO4 solution and voltage range studied was between 0 and −0.7 V vs. a Ag/AgCl reference electrode. As expected, electrochemical performance was dependent on the particle size. When electrolyte was deaerated a stable capacitance of ≈50 F g−1 is provided by the nanosized sample for several hundred cycles. Other sulfate based salts (Na2SO4, K2SO4, Cs2SO4) were investigated as electrolytes but only Li2SO4 leads to a stable capacitance upon cycling, probably due to lithium intercalation. An hybrid cell consisting of this sample and MnO2 as negative and positive electrodes, respectively, delivered 0.3 F cm−2 (10 F g−1). Although these values are lower than reported for other aqueous hybrid cell, α-LiFeO2/MnO2 asymmetric capacitor is interesting from both, an economic and an environmental point of view.
Journal: Electrochimica Acta - Volume 55, Issue 25, 30 October 2010, Pages 7511–7515