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Shape-controlled battery grade iron phosphate and preparation method thereof

An iron phosphate and battery-level technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low lithium ion diffusion rate and limited battery reaction kinetics, and achieve good monodispersity and short ion migration The effect of distance and high purity

Active Publication Date: 2013-09-04
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The low diffusion rate of lithium ions inside the cathode material limits the reaction kinetics during charging and discharging of the battery

Method used

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  • Shape-controlled battery grade iron phosphate and preparation method thereof
  • Shape-controlled battery grade iron phosphate and preparation method thereof
  • Shape-controlled battery grade iron phosphate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Measure deionized water 55.0mL and ethylene glycol 5.0mL, configure reaction mother liquor; Weigh 0.82g ferric chloride hexahydrate (99%), 2.08g phosphoric acid (85%), 0.33g urea (99%) respectively and Dissolve in the above mother liquor to form a reaction solution; transfer the reaction solution to a 100mL hydrothermal reaction kettle, and react at 180°C for 2 hours; filter, wash and dry the product to obtain spherical ferric phosphate with a particle size of about 6 μm. The scanning electron microscope photo is as follows: figure 2 .

Embodiment 2

[0027] Measure the filtrate 60mL in embodiment 1 as reaction mother liquor; Take by weighing 0.82g ferric chloride hexahydrate (99%), 0.69g phosphoric acid (85%), 0.33g urea (99%) respectively and be dissolved in above-mentioned mother liquor, form Reaction solution; transfer the reaction solution to a 100mL hydrothermal reaction kettle, and react at 180°C for 2 hours; filter, wash and dry the product to obtain solid spherical iron phosphate with a particle size of about 5 μm, and the scanning electron microscope photo is as follows image 3 .

Embodiment 3

[0029] Measure 30mL of deionized water and 30mL of ethylene glycol to configure the reaction mother liquor; weigh 0.82g of ferric chloride hexahydrate (99%), 2.08g of phosphoric acid (85%), and 0.33g of urea (99%) respectively and dissolve them in The above mother liquor was used to form a reaction solution; the reaction solution was transferred to a 100mL hydrothermal reaction kettle, and reacted at 180°C for 2 hours; the product was filtered, washed and dried to obtain a disc-shaped iron phosphate with a diameter of about 4 μm, scanning electron microscope photos Such as Figure 4 .

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Abstract

The invention discloses shape-controlled battery grade iron phosphate and a preparation method thereof. The method comprises the following steps of: (1) preparing reaction mother liquor; (2) dissolving raw materials in the mother liquor to form reaction liquor; (3) carrying out a hydrothermal reaction; and (4) filtering, washing and drying the product. The preparation method disclosed by the invention is simple in technical process and less in control parameters, and iron phosphate with regular shape can be obtained without any plasticizers and dispersants. The filtrate in the step (4) is recovered as the reaction mother liquor which can be repeatedly used, so that the method is saving and environmental-friendly. The iron phosphate prepared by the method is high in purity, wherein the ratio of phosphorus to iron is 1:1. The iron phosphate is formed by iron phosphate particles with regular shapes. The particles are combined by sheet or columnar primary particles in nanoscale. The shapes of the particles after combination are circular sheets, similar spheres, spheres or porous spheres. The monodispersity of the iron phosphate particles is good, and the diameter size is adjusted in the range of 1-50 mu m.

Description

technical field [0001] The invention belongs to the technical field of iron phosphate material preparation technology, and in particular relates to a battery-grade iron phosphate with controllable morphology and a preparation method thereof. Background technique [0002] Iron phosphate is a widely used chemical raw material, which can be used as food additives, pigments, ceramic glazes and catalysts, etc. The traditionally synthesized iron phosphate particles have poor morphology, and the ratio of phosphorus to iron is not fixed, often containing a large amount of ferrous iron or Sodium, potassium, sulfate, ammonium and other impurities. [0003] In recent years, lithium iron phosphate has been considered as the preferred positive electrode for power lithium-ion secondary batteries due to its high theoretical capacity, high safety, suitable for high-rate charge and discharge, long cycle life, environmental friendliness, and no memory effect. one of the materials. Iron phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37
Inventor 唐月锋沈飞谢双飞戎葆华陆彦文刘学文陈庆霖唐琨杨华珍吴星云倪亮刘盼星彭慕洋陈延峰
Owner NANJING UNIV
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