Preparation method of high-rate lithium iron phosphate positive electrode material
A technology of lithium iron phosphate and cathode materials, which is applied in the field of lithium-ion batteries, can solve the problems of high battery internal resistance and heat conduction requirements, small ion diffusion coefficient, and fast battery temperature rise, so as to reduce the internal and surface resistance of materials, and the process is simple , to promote the effect of rapid delivery
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[0025] A method for preparing a high-rate lithium iron phosphate positive electrode material, comprising the following steps:
[0026] Step 1: Phosphoric acid, ferrous sulfate, and lithium hydroxide with a molar ratio of 1:(0.95-1.05):(2.95-3.05) are used as phosphorus source, iron source, and lithium source, and dispersant polyvinylpyrrolidone and reducing agent ascorbic acid are added , mixed evenly, transferred to a reaction kettle at 150°C to 180°C, hydrothermally reacted for 8h to 12h to obtain a lithium iron phosphate precipitation solution, which was centrifuged, washed, and dried to obtain nanometer lithium iron phosphate primary particles;
[0027] Step 2: Using lithium hydroxide solution with a concentration of 8M ~ 10M as the reaction medium, mix titanium nitride nanoparticles and lithium hydroxide at a mass ratio of 1: (1 ~ 20), transfer to the reaction kettle at 120°C ~ 180°C ℃, alkali-thermal reaction for 8h to 24h to obtain a precipitation solution, pickling, wa...
Embodiment 1
[0032] A method for preparing a high-rate lithium iron phosphate positive electrode material, comprising the following steps:
[0033] Step 1: Phosphoric acid, ferrous sulfate, and lithium hydroxide are used as phosphorus sources, iron sources, and lithium sources, and the molar ratio is 1:0.95:2.95. Add polyvinylpyrrolidone as a dispersant and ascorbic acid as a reducing agent, mix evenly, transfer to a reactor at 150°C for hydrothermal reaction for 8 hours to obtain a lithium iron phosphate precipitation solution, centrifuge, wash, and dry to obtain primary nanoparticles of lithium iron phosphate;
[0034] Step 2: Use 8M lithium hydroxide solution as the reaction medium, add titanium nitride nanoparticles according to the mass ratio of titanium nitride nanoparticles to lithium hydroxide as 1:1, mix well, transfer to the reaction kettle for alkaline thermal reaction at 120°C 8h to obtain the precipitation solution, pickling, washing, centrifugation, and drying to obtain titan...
Embodiment 2
[0038] A method for preparing a high-rate lithium iron phosphate positive electrode material, comprising the following steps:
[0039] Step 1: Phosphoric acid, ferrous sulfate, and lithium hydroxide are used as phosphorus sources, iron sources, and lithium sources, and the molar ratio is 1:1:3. Add the dispersant polyvinylpyrrolidone and the reducing agent ascorbic acid, mix evenly, transfer to the reaction kettle for hydrothermal reaction at 170°C for 10 hours to obtain the lithium iron phosphate precipitation solution, centrifuge, wash, and dry to obtain the primary nano-lithium iron phosphate particles;
[0040] Step 2: Use 9M lithium hydroxide solution as the reaction medium, add titanium nitride nanoparticles according to the mass ratio of titanium nitride nanoparticles to lithium hydroxide as 1:5, mix evenly, transfer to the reaction kettle for alkali-thermal reaction at 150°C 20h to obtain the precipitation solution, pickling, washing, centrifugation and drying to obtai...
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