Method for preparing special diamond structure lithium iron phosphate 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 inability to realize fast and high-power charging and discharging of batteries, and limited improvement of conductivity and lithium ion diffusion rate. Lithium iron phosphate lithium-ion battery application and other issues, to achieve the effect of short and efficient preparation method, improved electrochemical performance, fast and high-power charge and discharge
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Embodiment 1
[0032] 1) Mix lithium carbonate, ferric chloride, and ammonium dihydrogen phosphate with lithium source, iron source, and phosphorus source at a molar ratio of Li:Fe:P=1:1.05:1, and use 0.2% of the mass of the dispersion system as a dispersant Sodium polycarboxylate, forcibly dispersed by an ultrasonic disperser to form a dispersed state;
[0033] 2) Heat 2 times the theoretical amount of sodium sulfate decahydrate in the reaction kettle to 60-80°C. After it is completely melted, add the dispersion obtained in step 1) and add 10% of the system mass at the same time Glycerin, after stirring for 20min, a slurry was formed;
[0034] 3) Send the slurry obtained in step 2) into a high-pressure homogenizer. Under the action of high pressure of 30-35MPa, the slurry passes through a long-necked valve with a length of 50cm and an aperture of 0.15mm, and the homogenization channel is heated by an oil bath. The setting is constant at 235-245°C. Under the action of shear and temperature,...
Embodiment 2
[0038] 1) Mix lithium oxalate, iron phosphate, diammonium hydrogen phosphate, lithium source, iron source, and phosphorus source in a molar ratio Li: Fe: P = 1: 1.1: 1, and use 0.3% of the mass of the dispersion system as a dispersant acrylic acid - Acrylate-sulfonate copolymer, forcedly dispersed by an ultrasonic disperser to form a dispersed state;
[0039] 2) Heat 2.5 times the theoretical amount of sodium sulfate decahydrate in the reaction kettle to 60-80°C. After it is completely melted, add the dispersion obtained in step 1) and add 12% of the system mass at the same time Glycerin, after stirring for 30min, a slurry was formed;
[0040] 3) Send the slurry obtained in step 2) into a high-pressure homogenizer. Under the action of high pressure of 30-35MPa, the slurry passes through a long-necked valve with a length of 60cm and an aperture of 0.15mm, and the homogenization channel is heated by an oil bath. The setting is constant at 235-245°C. Under the action of shear an...
Embodiment 3
[0044] 1) Mix lithium nitrate, iron oxide, and ammonium dihydrogen phosphate with lithium source, iron source, and phosphorus source at a molar ratio of Li:Fe:P=1:1.15:1, and use 0.5% of the mass of the dispersion system as a dispersant to polymerize Ammonium carboxylate is forcibly dispersed by an ultrasonic disperser to form a dispersed state;
[0045] 2) Heat 3 times the theoretical amount of sodium sulfate decahydrate as the sodium source in the reactor to 60-80°C. After it is completely melted, add the dispersion obtained in step 1) and add 15% of the system mass at the same time Glycerol, after stirring for 45min, a slurry was formed;
[0046] 3) Send the slurry obtained in step 2) into a high-pressure homogenizer. Under the action of high pressure of 30-35MPa, the slurry passes through a long-necked valve with a length of 80cm and an aperture of 0.2mm, and the homogenization channel is heated by an oil bath. The setting is constant at 235-245°C. Under the action of she...
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