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AIST TODAYNo.16 Spring 2005 [ PDF:17.6MB ]

Contents List Message:Toward the Second Research Phase Feature : Volcanic Eruptions and the Blessings from the Earth Research Hot Line In Brief

Novel Ionic Liquids Electrolyte for Li Metal Anode
- Ionic Liquids Based on Aliphatic Quaternary Ammonium -

We have synthesized new ionic liquids based on aliphatic quaternary ammonium and fluorine-contained anion. Especially, N-methyl-N-propylpiperidinium (PP13) bis(trifluoromethylsulfonyl) imide (TFSI) exhibits wide electrochemical windows comparing with conventional RTILs based on 1-ethyl-3-methylimidazolium (EMI) and TFSI. In the RTIL (PP13-TFSI), lithium metal could be electrochemically deposited on a metal electrode. The most striking feature was that the surface of the deposited lithium was very smooth comparing with a dendritic deposition in an conventional organic electrolyte.
Fig.1
Fig. 1 SEM pictures of electrochemically deposited Li metal.
(a) in an organic solvent (PC), (b) in PP13-TFSI.

Fig.2
Fig. 2 Various voltammograms taken in RTILs at 298 K. (blue) linear sweep voltammograms (LSV) of PP13-TFSI on glassy carbon electrode (GC); (green) LSV of EMI-TFSI on GC; (red) cyclic voltammogram of PP13-TFSI containing Li-TFSI. Scan rate = 50 mV/s.

Relational Information

AIST Today Vol.5,No3 (2005-No.16) 28

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