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Preparation method of battery-grade iron phosphate composite material

A composite material, iron phosphate technology, applied in phosphorus compounds, battery electrodes, chemical instruments and methods, etc., can solve the problems of serious environmental pollution, strong acidity of waste liquid, and large water consumption, so as to reduce energy consumption and reduce vibration. The effect of high density and cost saving of raw materials

Active Publication Date: 2014-07-23
GUANGZHOU LIBODE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of the above preparation method are: the waste liquid is highly acidic during precipitation and separation, and contains a large amount of phosphate, sulfate and sodium ions, causing serious environmental pollution; and it needs to consume a large amount of water resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 202.96g ferrous oxalate (purity 97.5%), 129.07g ammonium dihydrogen phosphate (chemically pure), 1.75g ​​copper oxide (analytical pure), use 400ml deionized water as solvent to mix ferrous oxalate, ammonium dihydrogen phosphate and oxide Copper is uniformly dispersed and ground for 4 hours before spray drying; set the spray drying parameters, the inlet temperature is 350°C, the outlet temperature is 120°C, the rotation speed of the atomizing disc is 20,000 rpm, and then the spherical material obtained by spray drying is sintered at high temperature in the air , the air flow rate is 30 cubic meters per hour, the sintering temperature is 750°C, and the battery-grade iron phosphate composite material is obtained after sintering for 6 hours.

Embodiment 2

[0017] Take 100.96g ferrous oxalate (purity 97.5%), 45.27g iron oxide red (purity 97.0%), 148.00g diammonium hydrogen phosphate (chemically pure), 1.33g magnesium oxide (analytical pure), use 230ml deionized water as solvent Uniformly disperse and grind ferrous oxalate, red iron oxide, diammonium hydrogen phosphate and magnesium oxide for 6 hours and then spray dry; set the spray drying parameters, the inlet temperature is 300°C, the outlet temperature is 90°C, and the rotation speed of the atomizing disc is 8000 rpm , and then sinter the spherical material obtained by spray drying at high temperature in oxygen, the oxygen flow rate is 10 cubic meters per hour, the sintering temperature is 650°C, and the battery-grade iron phosphate composite material is obtained after sintering for 8 hours.

Embodiment 3

[0019] Take 100.96g ferrous oxalate (purity 97.5%), 45.27g iron oxide red (purity 97.0%), 65.50g ammonium dihydrogen phosphate (chemically pure), 65.00g industrial phosphoric acid (85% mass concentration), 0.88g titanium oxide ( Analytical pure), use 280ml deionized water as solvent to uniformly disperse and grind ferrous oxalate, red iron oxide, ammonium dihydrogen phosphate, industrial phosphoric acid and titanium oxide for 4 hours and then spray dry; set the spray drying parameters, the inlet temperature is 300℃ , the outlet temperature is 100°C, the rotation speed of the atomizing disc is 12000 rpm, and then the spherical material obtained by spray drying is sintered at high temperature in oxygen, the oxygen flow rate is 15 cubic meters per hour, the sintering temperature is 680°C, and the battery grade is obtained after sintering for 12 hours. Iron phosphate composite.

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Abstract

The invention discloses a method for preparing a battery-grade iron phosphate composite material, which comprises the following steps: adding an iron source, a phosphorus source and additives into deionized water for thorough mixing and grinding for 2 to 8 hours, the iron source, phosphorus source and The molar ratio of additives is (0.97~1.03):(0.97~1.03):(0~0.03); then spray drying to obtain spherical iron phosphate precursor; then the spherical iron phosphate precursor is sintered at high temperature under air or oxygen atmosphere , the sintering temperature is 500-850°C, and the battery-grade iron phosphate composite material is obtained after sintering for 6-12 hours. The preparation method of the present invention has mild reaction conditions, good equipment reliability, and no waste liquid pollution, which helps to improve the performance of lithium iron phosphate materials in large-scale power batteries such as electric vehicles, electric tools, automobile 42V batteries, and photovoltaic energy storage batteries. Competitiveness.

Description

technical field [0001] The invention relates to a preparation method of an iron phosphate composite material. Background technique [0002] In the field of power batteries, there are very strict requirements on battery materials. The first is safety. Due to the stability of the structure of lithium iron phosphate itself, oxygen will not be released at high temperatures, which completely eliminates the safety brought by traditional cathode materials. The safety of the power battery is improved; the second is the excellent electrochemical performance, and the material has excellent rate characteristics after carbon coating and metal ion doping. Due to the good structural stability of the phosphate radical, it can theoretically be achieved The cycle life of 2000 times is especially suitable for various high-power electrical appliances and automotive power batteries. Therefore, lithium iron phosphate is currently recognized as the most suitable material for large-capacity power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/37
CPCY02E60/10
Inventor 蒋华锋骆宏钧
Owner GUANGZHOU LIBODE NEW MATERIAL
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