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Nanoscale iron phosphate precursor and preparation method thereof, and lithium iron phosphate and preparation method thereof

A technology of lithium iron phosphate and iron phosphate, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of different precipitation speeds, limited applications, uneven material composition, etc., and achieve stable performance , the effect of high conductivity

Inactive Publication Date: 2021-01-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the co-precipitation method is prepared by stirring and mixing the ferric salt and the phosphate solution in a certain proportion. The co-precipitation method does not need to be carried out under high temperature and high pressure, and the operation is simple, but the precipitation speed of each component in the solution is different, resulting in different material compositions. Uniform, which limits the application of this method in production

Method used

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  • Nanoscale iron phosphate precursor and preparation method thereof, and lithium iron phosphate and preparation method thereof
  • Nanoscale iron phosphate precursor and preparation method thereof, and lithium iron phosphate and preparation method thereof
  • Nanoscale iron phosphate precursor and preparation method thereof, and lithium iron phosphate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] S1: Prepare liquid A: 0.1mol / L 100mL NH 4 h 2 PO 4 Solution; B solution: 0.2mol / L 50mL of FeCl 3 Dissolve 0.9mL of furfuryl alcohol in the solution;

[0040] S2: Pour liquid A into a 250mL three-neck flask, stir and keep warm at 93°C for a period of time, then drop liquid B into liquid A at a rate of 1mL / min;

[0041] S3: Add 1mL ammonia water to the system, stir and react for 6h, the precipitate is filtered, washed and dried to obtain spherical FePO 4 Precursor;

[0042] S4: Combine the precursor obtained in S3 with Li 2 CO 3 Put it into a mortar at a ratio of 1:0.5 and add absolute ethanol for wet grinding for 1 hour, then dry it, place the dry material in an Ar atmosphere at 700°C, and calcinate it at a high temperature for 6 hours to obtain lithium iron phosphate.

Embodiment 2

[0044] S1: Prepare liquid A: 0.1mol / L 100mL NH 4 h 2 PO 4 Solution; B solution: 0.2mol / L 50mL of FeCl 3 Dissolve 0.9mL of furfuryl alcohol in the solution;

[0045] S2: Pour liquid A into a 250mL three-neck flask, stir and keep warm at 93°C for a period of time, then drop liquid B into liquid A at a rate of 1mL / min;

[0046] S3: Add 0.5mL ammonia water to the system, stir and react for 6h, the precipitate is filtered, washed and dried to obtain spherical FePO 4 Precursor;

[0047] S4: Combine the precursor obtained in S3 with Li 2 CO 3 Put it into a mortar at a ratio of 1:0.5 and add absolute ethanol for wet grinding for 1 hour, then dry it, place the dry material in an Ar atmosphere at 700°C, and calcinate it at a high temperature for 6 hours to obtain lithium iron phosphate.

Embodiment 3

[0049] S1: Prepare liquid A: 0.1mol / L 100mL NH 4 h 2 PO 4Solution; B solution: 0.2mol / L 50mL of FeCl 3 Dissolve 0.9mL of furfuryl alcohol in the solution;

[0050] S2: Pour liquid A into a 250mL three-neck flask, stir and keep warm at 93°C for a period of time, then drop liquid B into liquid A at a rate of 1mL / min;

[0051] S3: Add 2mL ammonia water to the system, stir and react for 6h, the precipitate is filtered, washed and dried to obtain spherical FePO 4 Precursor;

[0052] S4: Combine the precursor obtained in S3 with Li 2 CO 3 Put it into a mortar at a ratio of 1:0.5 and add absolute ethanol for wet grinding for 1 hour, then dry it, place the dry material in an Ar atmosphere at 700°C, and calcinate it at a high temperature for 6 hours to obtain lithium iron phosphate.

[0053] figure 1 It is the microscopic morphology of the iron phosphate precursor prepared in Example 1, which is amorphous and has a uniform particle size distribution, about 50 nm.

[0054] fi...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a nanoscale iron phosphate precursor, a preparation method of the nanoscale iron phosphate precursor,lithium iron phosphate and a preparation method of the lithium iron phosphate. The method comprises the following steps: 1) preparing an aqueous solution of NH4H2PO4; and preparing an aqueous solution of FeCl3 and furfuryl alcohol; 2) heating the aqueous solution of NH4H2PO4 obtained in the step 1) to 90-95 DEG C while stirring, and dropwise adding the aqueous solution of FeCl3 and furfuryl alcohol obtained in the step 1) under the conditions of heating, heat preservation and stirring; and 3) adding ammonia water into a mixed system obtained in the step 2), stirring to react, and filtering, washing and drying the precipitate to obtain the spherical nanoscale iron phosphate precursor. The lithium iron phosphate provided by the invention is high in conductivity and stable in performance asa positive electrode material, so that the lithium battery is ensured to have high and stable charging and discharging performance and charging and discharging efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nanoscale iron phosphate precursor and a preparation method thereof, and lithium iron phosphate and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in various portable electronic devices since they were commercialized in 1991 because of their high specific capacity, high operating voltage, high stability, environmental friendliness, and almost no memory effect. Such as laptops, smart phones, digital cameras and other high-end electronic products. With the continuous development of energy storage technology and social needs, all kinds of high-end electronic products and power vehicles have higher and higher requirements for battery stability, safety, service life, energy density, rate performance, etc., and cathode materials It is also one of the most important factors affecting and restric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/04H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/5825H01M4/625H01M4/0471H01M10/0525B82Y30/00B82Y40/00H01M2004/028H01M2220/20H01M2220/30Y02E60/10
Inventor 韩建涛卢宇方淳
Owner HUAZHONG UNIV OF SCI & TECH
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