Carbon-coated lithium iron phosphate composite material and preparation method thereof, lithium ion battery
A technology of carbon-coated lithium iron phosphate and composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve uneven carbon coating, temperature differences, and inability to effectively improve lithium iron phosphate ion conductivity and electronic conduction rate and other issues
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[0040] The embodiment of the present invention provides a method for preparing a carbon-coated lithium iron phosphate composite material, comprising the following steps:
[0041] S10. After mixing the lithium source, iron phosphate, carbon source and water, grinding and granulating to obtain the first powder;
[0042] S20. Obtain an iron-based metal-organic framework, mix the iron-based metal-organic framework with the first powder, and grind to obtain a second powder;
[0043] S30. Calcining the second powder in a protective gas atmosphere to obtain a carbon-coated lithium iron phosphate composite material.
[0044] The preparation method of the carbon-coated lithium iron phosphate composite material provided by the embodiment of the present invention firstly mixes the lithium source, iron phosphate, carbon source and water, and then grinds and granulates, so that the lithium source and iron phosphate are fully mixed evenly, and the carbon source The first coating is carried o...
Embodiment 1
[0074] A method for preparing a carbon-coated lithium iron phosphate composite material, comprising the steps of:
[0075] S10. Mix iron phosphate, lithium carbonate, glucose and water, and grind to obtain the first mixed slurry with a particle size of 200-1000 nm, and then use spray granulation to obtain the first powder with a particle size of 5-20 μm. Wherein, the molar ratio of the lithium source, the iron phosphate and the carbon source is 1.02:1:0.2.
[0076] S20. After mixing MOF-74 with the first powder, grind it into a second powder with a particle size of 0.5-5 μm. Wherein, the molar ratio of the iron phosphate to the iron-based metal-organic framework in the second powder is 1:0.05.
[0077] S30. Calcining the second powder for 10 hours under a protective gas atmosphere at a temperature of 780° C., each raw material component fully reacts to form a carbon-coated lithium iron phosphate three-dimensional network composite material with a particle size of about 1 micr...
Embodiment 2
[0079] A method for preparing a carbon-coated lithium iron phosphate composite material, comprising the steps of:
[0080] S10. Mix iron phosphate, lithium carbonate, glucose and water, and grind to obtain the first mixed slurry with a particle size of 200-1000 nm, and then use spray granulation to obtain the first powder with a particle size of 5-20 μm. Wherein, the molar ratio of the lithium source, the iron phosphate and the carbon source is 1.02:1:0.2.
[0081] S20. After mixing MOF-74 with the first powder, grind it into a second powder with a particle size of 0.5-5 μm. Wherein, the molar ratio of the iron phosphate to the iron-based metal-organic framework in the second powder is 1:0.1.
[0082] S30. Calcining the second powder for 10 hours under a protective gas atmosphere at a temperature of 780° C., each raw material component fully reacts to form a carbon-coated lithium iron phosphate three-dimensional network composite material with a particle size of about 1 micro...
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Abstract
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