Vanadium-titanium ion-codoped lithium iron phosphate material and preparation method thereof
A lithium iron phosphate, vanadium ion technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problem of difficult to improve the rate performance and specific capacity of lithium iron phosphate at the same time, can not well meet the requirements of lithium ion power batteries, phosphoric acid. The effect of iron and lithium ion conductivity is not obvious, and the effect of superior rate discharge performance, superior cycle stability and superior electrochemical performance is achieved.
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Embodiment 1
[0035] The preparation steps are as follows: lithium carbonate, ferrous oxalate, ammonium dihydrogen phosphate, ammonium metavanadate and titanium dioxide are mixed according to the molar ratio of Li + : Fe 2+ : Ti 4+ :V 5+ :PO 4 3- =1.00: 0.975: 0.005: 0.02: 1.00 Weighing, adding glucose according to 35% of the mass of lithium carbonate, and then adding absolute ethanol according to 80% of the total mass of the reactant material, and ball milling for 4 hours to obtain a uniformly mixed slurry. Then it was placed in a tube furnace protected by a nitrogen atmosphere, and the temperature was raised to 400 °C at a heating rate of 2 °C / min for pre-sintering, and the temperature was kept for 4 hours; Hour. Naturally cool down to room temperature with the furnace to get titanium and vanadium ion co-doped lithium iron phosphate material, the molecular formula is LiFe 1-x-y Ti x V y (PO 4 ) / C, where x=0.005, y=0.02.
[0036] In order to compare needs, titanium-doped lithium...
Embodiment 2
[0040] The preparation steps are as follows: lithium oxalate, iron oxide, diammonium hydrogen phosphate, ammonium metavanadate and tetramethyl titanate are mixed according to the molar ratio of Li + : Fe 3+ : Ti 4+ :V 5+ :PO 4 3- =1.00:0.98:0.01:0.01:1 Weighing, add glucose according to 30% of the mass of lithium oxalate, then add absolute ethanol according to 80% of the total mass of reactant materials, and ball mill and mix for 6 hours to obtain a uniformly mixed slurry. Then it was placed in a tube furnace protected by a nitrogen atmosphere, and the temperature was raised to 400 °C at a heating rate of 2 °C / min for pre-sintering, and the temperature was kept for 4 hours; Hour. Naturally cool down to room temperature with the furnace to get titanium and vanadium ion co-doped lithium iron phosphate material, the molecular formula is LiFe 1-x-y Ti x V y (PO 4 ) / C, where x=0.01, y=0.01.
[0041] The lithium iron phosphate material co-doped with titanium and vanadium ...
Embodiment 3
[0043] The preparation steps are as follows: lithium oxalate, ferrous acetate, ammonium phosphate, vanadium pentoxide and titanium dioxide are mixed according to the molar ratio of Li + : Fe 2+ : Ti 4+ :V 5+ :PO 4 3- =1.00:0.97:0.01:0.02:1.00 Weighing, adding sucrose according to 40% of the mass of lithium oxalate, and then adding acetone according to 90% of the total mass of the reactant material, ball milling and mixing for 6 hours to obtain a uniform slurry, and then It is placed in a tube furnace protected by a nitrogen atmosphere, and the temperature is raised to 350°C at a rate of 2°C / min for pre-sintering, and the temperature is kept for 6 hours; then the temperature is raised to 720°C for calcination at a rate of 2°C / min, and the temperature is kept for 8 hours. Naturally cool down to room temperature with the furnace to get titanium and vanadium ion co-doped lithium iron phosphate material, the molecular formula is LiFe 1-x-y Ti x V y (PO 4 ) / C, where x=0.01,...
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