A kind of nano lithium iron phosphate and preparation method thereof
A lithium iron phosphate, iron phosphate technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as poor electrochemical performance of lithium iron phosphate, and achieve good conductivity.
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[0013] A preparation method of nano lithium iron phosphate, comprising the following preparation steps:
[0014] The nanoplatelet iron phosphate, lithium source, organic solvent, carboxylic acid source and surfactant are mixed and subjected to wet ball milling to form a mixture. Lithium sources include lithium carbonate, lithium hydroxide or lithium oxalate, with no other impurities introduced. Organic solvents include ethylene glycol. The molar ratio of nanosheet iron phosphate, lithium ion in lithium source, organic solvent, carboxylic acid in carboxylic acid source and surfactant is 1:1-1.05:1-3:0.2-1:0.005-0.05.
[0015] The organic solvent includes ethylene glycol. Iron phosphate, lithium source and carboxylic acid source are dissolved in the organic solvent, wet ball milling is performed first, and iron phosphate, lithium source and carboxylic acid source are fully mixed and dissolved in the organic solvent. The particle size becomes smaller, which is beneficial to the...
Embodiment 1
[0032] A nanometer lithium iron phosphate, the preparation method of this nanometer lithium iron phosphate comprises the following preparation steps:
[0033]Ferrous acetate, ferrous phosphate and oxalic acid were mixed in the reaction kettle, then slowly adding hydrogen peroxide with a mass concentration of 20%, then adding phosphoric acid to adjust the pH value of the reaction system to 2, and then reacting at a temperature of 80°C for 300min. Wherein, the molar ratio of ferrous ion, phosphate radical, oxalic acid and hydrogen peroxide in the reaction system is 1:1.2:0.03:0.8. After the reaction is completed, the reaction system is filtered, the product obtained by filtration is ultrasonically washed with ethanol to obtain a precipitate, and the precipitate is dried to obtain nano-flaky iron phosphate.
[0034] The nanosheet iron phosphate, lithium hydroxide, ethylene glycol, oxalic acid and cetyltrimethylammonium bromide in a molar ratio of 1:1:2:0.4:0.005 were mixed and su...
Embodiment 2
[0036] A nanometer lithium iron phosphate, the preparation method of this nanometer lithium iron phosphate comprises the following preparation steps:
[0037] Ferric acetate, ferrous phosphate and acetic acid were mixed in the reaction kettle, then slowly adding hydrogen peroxide with a mass concentration of 25%, then adding phosphoric acid to adjust the pH value of the reaction system to 3, and then reacting at a temperature of 100 ° C for 100 min. Wherein, the molar ratio of iron ion, phosphate radical, acetic acid and hydrogen peroxide in the reaction system is 1:1:0.02:0.5. After the reaction is completed, the reaction system is filtered, the product obtained by filtration is ultrasonically washed with ethanol to obtain a precipitate, and the precipitate is dried to obtain nano-flaky iron phosphate.
[0038] The nanosheet iron phosphate, lithium carbonate, polyol, citric acid, and polysorbate with a molar ratio of 1:0.51:1:0.6:0.01 were mixed and subjected to wet ball mill...
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