Preparation And Electrochemical Performance Of Lithium Vanadate/FSN-1 Anode Materials

Li₃VO₄ was coated on graphite carbon to prepare an anode material Li₃VO₄/C（LVC）for lithium batteries.It was found that poly vinyl alcohol（PVA）could improve the wetting and distribution of Li₃VO₄ over graphite surface and form conductive carbon network around the crystals of Li₃VO₄.The conductive carbon network could tightly anchor the Li₃VO₄ crystals to the graphite surface and,therefore,improve the conductivity of the material for both lithium ions and electrons.The excellent conductivity of the material guarantees its high stability at high cycling rate.When the current density increased from 100 mA/g to 400 mA/g,the specific capacity of the material only reduced from 386 mAh/g to 345 mAh/g.In this material（contain 40wt%of Li₃VO₄）,the Li₃VO₄ phase contributed a specific capacity of 500 mAh/g,corresponding to intercalate/deintercalate 2.5 mol lithium ions for each mol of Li₃VO₄.In this investigation,the electrochemistry performance of material was investigated in terms of different electrode coating thicknesses on current collector and material firing temperatures.The material was coated with thickness of 30 μm,60μm,and 90 μm.It was found that electrode coated with a thickness of 30 μm performance the best.The material LVCP-10（with a PVA content of 10%）reaches a specific capacity of 390 mAh/g.The material fired at 450℃ has the best cycling stability with the least attenuation.After charging and discharging at 100 mA/g,200 mA/g,and 500 mA/g for hundred cycles,a specific capacity of 99%of it’s initial specific capacity is still kept.