A Novel Aqueous Li4Fe(CN)6 Cathode And Hydrophobic Ionic Liquid Electrolyte Combined Lithium-ion Battery
Bikash Mandal, Indranarayan Basumallick and Susanta Ghosh
Volume 2, Issue 11, Page 745-748, Year 2017 | DOI: 10.5185/amp.2017/588
Keywords: Li4Fe(CN)6 aqueous cathode, cost effective method, hydrophobic ionic liquid electrolyte, charge-discharge, lithium-ion battery.
Abstract: Present study reports an easy and cost-effective method of synthesis of Li4Fe(CN)6 cathode from K4Fe(CN)6.3H2O and LiClO4 in aqueous medium for its use in lithium-ion battery. The synthesized Li4Fe(CN)6 is characterized by UV-Vis, FTIR and cyclic-voltammetry studies. A special laboratory model lithium-ion battery is designed, where aqueous Li4Fe(CN)6 solution acts as a cathode, metallic lithium as anode and 1 molar solution of LiPF6 dissolved in water immiscible ionic liquid, 1-Butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF6) as electrolyte. The cell exhibits an open circuit potential of 3.12 volt and a good charge-discharge cycling behaviour. The cell delivered a maximum discharge capacity of 86 mAhg-1 (theoretical capacity 112 mAhg-1) at 0.2 C rates with an average discharge potential of 2.1 volts. Although the ionic liquid is a little bit cost intensive, but the easy synthesis methodology with the cheapest raw materials and overall cycling efficiency, makes this technology available as a green economical energy storage device in the current battery industry. Copyright © 2017 VBRI Press.