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Preparation method of lithium iron phosphate and product and application of lithium iron phosphate

A technology of lithium iron phosphate and phosphoric acid, applied in the field of new energy materials, can solve the problems of difficult control of synthesis conditions, difficult control of components, and high production costs, and achieve the effects of low cost, environmental friendliness, and reduced production costs.

Pending Publication Date: 2021-10-22
唐山亨坤新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned technical problems, the present invention provides a preparation method of lithium iron phosphate and its products and applications. The method solves the technical problems in the prior art that the process is complicated, the synthesis conditions are not easy to control, the production cost is high, and the composition control is difficult.

Method used

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  • Preparation method of lithium iron phosphate and product and application of lithium iron phosphate
  • Preparation method of lithium iron phosphate and product and application of lithium iron phosphate
  • Preparation method of lithium iron phosphate and product and application of lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) 57.6 parts by weight of 85% phosphoric acid is added to 142.6 parts by weight of deionized water to prepare a phosphoric acid solution, add 37.5 parts by weight of natural magnetite powder under stirring, continue to stir, and mix well , to obtain a stable mixed solution, add it to a nano sand mill for ball milling, and obtain a black slurry with a particle size distribution D50 of about 400nm after ball milling. The material was taken out, and the obtained slurry was heated at 60 °C for 6 h, and then H 2 o 2 , until the black slurry is oxidized to white iron phosphate dihydrate slurry, and then the white slurry is spray-dried and placed in a muffle furnace for calcination at 600° C. for 8 hours to obtain a dry powder (anhydrous iron phosphate powder).

[0035] (2) Mix 150 parts of the dry powder obtained in step (1) with 38.8 parts of lithium carbonate and 15.8 parts of sucrose in deionized water and stir evenly, ball mill in a sand mill until D50 is below 200nm, ...

Embodiment 2

[0039] Same as Example 1, the difference is that the heating temperature of the black slurry in step 1 is 70°C.

[0040] The anhydrous iron phosphate powder and lithium iron phosphate powder prepared in this embodiment were tested using an X-ray diffractometer, and the XRD detection results of the obtained results were consistent withfigure 1 and figure 2 similar. After refinement by software (EXPGUI), the diffraction spectrum can be confirmed to correspond to anhydrous iron phosphate (PDF#77-0094) and lithium iron phosphate (PDF#81-1173) respectively without obvious impurity peaks. The precursor anhydrous iron phosphate prepared by the method and the final product lithium iron phosphate are pure phase substances.

[0041] Gained lithium iron phosphate battery material is carried out scanning electron microscope (SEM, Japan Electronics 6700F) test, the SEM observation result of gained is consistent with image 3 Similarly, the obtained carbon-coated lithium iron phosphate c...

Embodiment 3

[0043] Same as Example 1, the difference is that the heating temperature of the black slurry in step 1 is 80°C.

[0044] The anhydrous iron phosphate powder and lithium iron phosphate powder prepared in this embodiment were tested using an X-ray diffractometer, and the XRD detection results of the obtained results were consistent with figure 1 and figure 2 similar. After refinement by software (EXPGUI), the diffraction spectrum can be confirmed to correspond to anhydrous iron phosphate (PDF#77-0094) and lithium iron phosphate (PDF#81-1173) respectively without obvious impurity peaks. The precursor anhydrous iron phosphate prepared by the method and the final product lithium iron phosphate are pure phase substances.

[0045] Gained lithium iron phosphate battery material is carried out scanning electron microscope (SEM, Japan Electronics 6700F) test, the SEM observation result of gained is consistent with image 3 Similarly, the obtained carbon-coated lithium iron phosphate...

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Abstract

The invention discloses a preparation method of lithium iron phosphate and a product and application of lithium iron phosphate, and belongs to the field of new energy materials. According to the invention, the natural mineral raw material magnetite is creatively used as an iron source, and the lithium ion battery material lithium iron phosphate is successfully prepared through a simple and feasible technical route. No waste water or waste gas is discharged in the synthesis process, so that the purpose of green synthesis is achieved. Meanwhile, due to the fact that the cost of the mineral raw material magnetite is low, the production cost is further reduced through the technology, and the requirement of the downstream industry for the material is met. The method is expected to replace the current industrial production technology and is popularized and used in the industry.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of lithium iron phosphate and its product and application. Background technique [0002] In recent years, due to increasingly serious energy and environmental problems, lithium iron phosphate (LiFePO 4 ) as a power battery has gradually entered a stage of rapid development. At present, the power batteries used by most new energy vehicles in China are mainly lithium iron phosphate batteries and ternary batteries. At the same time, the safety performance of lithium iron phosphate is better, and due to the development in recent years, the production process has become more mature, and the production cost has gradually decreased. Considering the maturity, safety, and economy of lithium-ion battery technology, lithium iron phosphate is currently The battery is still a very mainstream electric vehicle power battery. [0003] The lithium iron phosp...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01B32/05H01M4/58H01M4/62H01M10/0525
CPCC01B25/45C01B32/05H01M4/5825H01M10/0525H01M4/625C01P2002/72C01P2004/03C01P2004/62C01P2006/40C01P2006/80H01M2004/028Y02E60/10
Inventor 付永跃
Owner 唐山亨坤新能源材料有限公司
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