A kind of preparation method of rhombic structure lithium iron phosphate special for secondary lithium battery
A secondary lithium battery and diamond-shaped structure technology, which is applied in secondary batteries, phosphates, phosphorus oxyacids, etc., can solve the problem of limited improvement in the conductivity of lithium ion diffusion rate, and the inability to realize rapid and high-power charging and discharging of batteries. Lithium iron phosphate lithium-ion battery application and other issues, to achieve the effect of improving electrochemical performance, short and efficient preparation method, fast high-power charge and discharge
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Embodiment 1
[0031] 1) Mix lithium carbonate, ferric chloride, and ammonium dihydrogen phosphate with lithium source, iron source, and phosphorus source in molar ratio Li:Fe:P=1:1.05:1, and use 0.2% dispersant based on the mass of the dispersion system Sodium polycarboxylate is forcibly dispersed by an ultrasonic disperser to form a dispersed state;
[0032] 2) The sodium sulfate decahydrate is twice the theoretical amount of the sodium source, heated to 60-80°C in the reactor, and after it is completely melted, the dispersion obtained in step 1) is added, and 10% of the system mass is added at the same time. Glycerol, stirred for 20min to form a slurry;
[0033] 3) The slurry obtained in step 2) is sent to a high pressure homogenizer, and the slurry is heated by an oil bath through a long neck valve with a length of 50cm and a hole diameter of 0.15mm under the action of a high pressure of 30-35MPa. The setting is constant at 235-245°C. Under the action of shear and temperature, the slurr...
Embodiment 2
[0037] 1) Mix lithium oxalate, iron phosphate, and diammonium hydrogen phosphate with lithium source, iron source, and phosphorus source in a molar ratio Li:Fe:P=1:1.1:1, and use 0.3% dispersant acrylic acid based on the mass of the dispersion system -Acrylate-sulfonate copolymer, which is forcibly dispersed by ultrasonic disperser to form a dispersed state;
[0038] 2) Heat 2.5 times the theoretical amount of sodium sulfate decahydrate in the reaction kettle to 60-80°C, and after it is completely melted, add the dispersion obtained in step 1), and add 12% of the system mass at the same time. Glycerol, stirred for 30min to form a slurry;
[0039] 3) The slurry obtained in step 2) is sent to a high-pressure homogenizer, and the slurry is heated by an oil bath through a long-neck valve with a length of 60cm and a hole diameter of 0.15mm under the action of a high pressure of 30-35MPa. The setting is constant at 235-245°C. Under the action of shear and temperature, the slurry mo...
Embodiment 3
[0043] 1) Mix lithium nitrate, iron oxide, and ammonium dihydrogen phosphate with lithium source, iron source, and phosphorus source in a molar ratio Li:Fe:P=1:1.15:1, and use 0.5% of the mass of the dispersion system to polymerize a dispersant. Ammonium carboxylate is forcibly dispersed by an ultrasonic disperser to form a dispersed state;
[0044] 2) 3 times the theoretical amount of sodium sulfate decahydrate of the sodium source is heated to 60-80 ℃ in the reactor, and after it is completely melted, the dispersion obtained in step 1) is added, and 15% of the system mass is added at the same time. Glycerol, stirred for 45min to form a slurry;
[0045] 3) The slurry obtained in step 2) is sent to a high-pressure homogenizer, and the slurry is heated by an oil bath through a long-neck valve with a length of 80cm and a hole diameter of 0.2mm under the action of a high pressure of 30-35MPa. The setting is constant at 235-245°C. Under the action of shear and temperature, the sl...
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