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Preparation method and application of high-performance lithium iron phosphate

A technology of lithium iron phosphate and iron phosphate, which is applied in the field of preparation of high-performance lithium iron phosphate, can solve problems such as poor cycle performance, low capacity, and insufficient product consistency, and achieve the reduction of impurities in the finished product, round particle shape, excellent The effect of electrochemical performance and long cycle performance

Pending Publication Date: 2022-07-12
YICHANG BRUNP CONTEMPORARY AMPEREX CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the products on the market generally have disadvantages such as insufficient product consistency, low capacity and poor cycle performance.

Method used

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  • Preparation method and application of high-performance lithium iron phosphate
  • Preparation method and application of high-performance lithium iron phosphate
  • Preparation method and application of high-performance lithium iron phosphate

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0034] This embodiment prepares a kind of high-performance lithium iron phosphate, and the specific process is:

[0035] (1) Prepare solvent A with certain volatility and chemical mildness in advance with water and ethanol, wherein the quality of ethanol is 0.35 times that of water, and lithium carbonate is dispersed in solvent A, and the quality of lithium salt is controlled to be 0.2 times that of solvent A. , stir and disperse evenly, then add acetic acid to adjust the pH to 7.5 to obtain a mixed solution; the porous iron phosphate (particle size D50 is 8.5 μm, porosity is 36%, pore size is about 32 nm) is dispersed in the pre-prepared solvent B (solvent B). The composition of B is the same as that of solvent A), the mass of porous iron phosphate is controlled to be 0.5 times that of solvent B, and the molar ratio of Fe in porous iron phosphate to Li in lithium salt is controlled to be 0.96:1, and sucrose and polyethylene glycol are added. alcohol in solvent B, control the ...

Embodiment 2

[0039] This embodiment prepares a kind of high-performance lithium iron phosphate, and the specific process is:

[0040] (1) Solvent A with certain volatility and chemical mildness is prepared in advance with water and n-heptane, wherein the quality of n-heptane is 0.24 times that of water, and lithium hydroxide monohydrate is dispersed in solvent A, and the quality of lithium salt is controlled to be 0.3 times the mass of solvent A, stir and disperse evenly, and then add oxalic acid to adjust the pH to 7.8 to obtain a mixed solution; disperse porous iron phosphate (particle size D50 is 10.2 μm, porosity is 31%, pore size is about 24 nm) in In the pre-prepared solvent B (the composition of the solvent B is the same as that of the solvent A), the mass of the porous iron phosphate is controlled to be 0.4 times that of the solvent B, and the molar ratio of Fe in the porous iron phosphate to Li in the lithium salt is controlled to be 0.97:1 , then add anhydrous glucose and polyvin...

Embodiment 3

[0044] This embodiment prepares a kind of high-performance lithium iron phosphate, and the specific process is:

[0045] (1) Solvent A with certain volatility and chemical mildness is prepared in advance with water, ethanol and n-heptane, wherein the quality of ethanol is 0.12 times that of water, the quality of n-heptane is 0.15 times that of water, and lithium hydroxide is dispersed in the solvent In A, control the mass ratio of lithium salt to be 0.35 times that of the solvent, stir and disperse evenly, and then add citric acid and acetic acid to adjust the pH to 7.3 to obtain a mixed solution; porous iron phosphate (particle size D50 is 4.6 μm, porosity is 36% , the pore size is about 38 nm) dispersed in the pre-prepared solvent B (the composition of the solvent B is the same as that of the solvent A), the quality of the porous iron phosphate is controlled to be 0.3 times that of the solvent B, and the Fe in the porous iron phosphate and the lithium salt are controlled. Th...

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Abstract

The method comprises the following steps: dispersing a lithium salt in a solvent A, then adding an organic acid to adjust the pH value to obtain a mixed solution, dispersing porous iron phosphate in a solvent B, then adding an organic carbon source to obtain a mixed slurry A, adding the mixed slurry A into the mixed solution, and grinding the obtained slurry to obtain the high-performance lithium iron phosphate. And adding a dispersing agent into the ground material, stirring and dispersing to obtain mixed slurry B, aging and drying the mixed slurry B under the pressure of 100-1000Pa, and sintering the obtained dry material in an inert atmosphere to obtain the lithium iron phosphate. According to the invention, the lithium salt and the organic carbon source are stably embedded in the porous iron phosphate structure, the reaction is more effective and sufficient, the generation of impure phases of the finished product is reduced, and the prepared product has more uniform and rounded particle morphology and more excellent electrochemical performance and long cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery material preparation, and in particular relates to a preparation method and application of high-performance lithium iron phosphate. Background technique [0002] With the depletion of petroleum resources and people's higher standards for living environment, the new energy industry has emerged, the widespread popularity of electric vehicles has become a reality, and the demand for high-energy density, large-capacity, and low-cost battery materials has also intensified. . Compared with ternary materials, lithium iron phosphate has the advantages of high safety and low cost. Since the subsidy of the new energy vehicle policy has declined, the cost reduction pressure of power batteries has increased, making the relatively cheap lithium iron phosphate market competitive. Enhanced, the market demand is strong, and even in short supply. At present, the products on the market generally have ...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45H01M10/0525H01M4/58C01P2004/61C01P2004/62C01P2002/72C01P2004/03C01P2006/40Y02E60/10H01M4/5825
Inventor 张世庆李长东杜锐阮丁山孙金鸣秦存鹏
Owner YICHANG BRUNP CONTEMPORARY AMPEREX CO LTD