- Title
- Cycling and rate performance of Li-LiFePO₄ cells in mixed FSI-TFSI room temperature ionic liquids
- Creator
- Lewandowski, A. P.; Hollenkamp, A. F.; Donne, S. W.; Best, A. S.
- Relation
- Journal of Power Sources Vol. 195, Issue 7, p. 2029-2035
- Publisher Link
- http://dx.doi.org/10.1016/j.jpowsour.2009.10.059
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2010
- Description
- A study is conducted of the performance of lithium iron(II) phosphate, LiFePO₄, as a cathode material in a lithium secondary battery that features an ionic liquid electrolyte solution and a metallic lithium anode. The electrolyte solution comprises an ionic liquid of a N-methyl-N-alkyl-pyrrolidinium (alkyl = n-propyl or n-butyl) cation and either the bis(fluorosulfonyl)imide [(FSO₂)₂N⁻] or bis(trifluoromethanesulfonyl)imide [(F₃CSO₂)₂N⁻] anion, together with 0.5 mol kg⁻¹ of lithium bis(trifluoromethanesulfonyl)imide salt. For N-methyl-N-propyl-pyrrolidinium bis(fluorosulfonyl)imide, coin cells discharging at rates of C/10 and 4C yield specific capacities of 153 and 110 mAh g⁻¹, respectively, at an average coulombic efficiency of 99.8%. This performance is maintained for over 400 cycles at 50 °C and therefore indicates that these electrolyte solutions support long-term cycling of both LiFePO₄ and metallic lithium while, due to the negligible volatility of ionic liquids, surrounding the lithium in an inherently safe, non-flammable medium.
- Subject
- lithium; battery; lithium iron phosphate; ionic liquid; pyrrolidinium; specific capacitance
- Identifier
- http://hdl.handle.net/1959.13/927782
- Identifier
- uon:10246
- Identifier
- ISSN:0378-7753
- Language
- eng
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