title: Ionic-liquid-assisted synthesis of nanostructured and carbon-coated Li3V2(PO4)3 for high-power electrochemical storage devices.
abstract: Carbon-coated Li3V2(PO4)3 (LVP) displaying nanostructured morphology can be easily prepared by using ionic-liquid-assisted sol-gel synthesis. The selection of highly viscous and thermally stable ionic liquids might promote the formation of nanostructures during the sol-gel synthesis. The presence of these structures shortens the diffusion paths and enlarges the contact area between the active material and the electrolyte; this leads to a significant improvement in lithium-ion diffusion. At the same time, the use of ionic liquids has a positive influence on the coating of the LVP particles, which improves the electronic conductivity of this material; this leads to enhanced charge-transfer properties. At a high current density of 40 C, the LVP/N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide material delivered a reversible capacity of approximately 100 mA h g(-1), and approximately 99 % of the initial capacity value was retained even after 100 cycles at 50 C. The excellent high rate and cycling stability performance make Li3V2(PO4)3 prepared by ionic-liquid-assisted sol-gel synthesis a very promising cathode material for high-power electrochemical storage devices.
authors.affiliation: Westfälische Wilhelms Universität, Institut für Physikalische Chemie-MEET, Corrensstrasse 28/30, 48149 Münster (Germany).
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Zhang
authors.forename: Nils
authors.initials: N
authors.lastname: Böckenfeld
authors.forename: Frank
authors.initials: F
authors.lastname: Berkemeier
authors.forename: Andrea
authors.initials: A
authors.lastname: Balducci
mesh_terms: D002244:Carbon / Q000737:chemistry*; D058266:Dielectric Spectroscopy; D011211:Electric Power Supplies; D004563:Electrochemistry; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D013449:Sulfonamides / Q000737:chemistry; D017968:Vanadium Compounds / Q000737:chemistry*
chemical_list: C517865:1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide; D007093:Imidazoles; D052578:Ionic Liquids; D010710:Phosphates; D013449:Sulfonamides; D017968:Vanadium Compounds; D002244:Carbon; D008094:Lithium
keywords: cathodes; ionic liquids; lithium vanadium phosphate; lithium-ion batteries; nanostructures