Method for preparing superfine and high-dispersibility lithium iron phosphate

A technology of lithium iron phosphate and ferrous sulfate, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve problems such as irregularity, irregular product shape, and wide particle size distribution

Inactive Publication Date: 2012-11-07
成都联禾化工医药有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of ball milling and drying, the following two defects will inevitably occur: 1. Due to the destruction of the shape and particle size distribution of the precursor in the ball milling process, the product has irregular shape and wide particle size distribution, thus It has a great impact on the processing performance of the product in the process of making batteries
2. The segregation and loss of carbon in the drying process lead to uneven distribution of carbon in the product and the content is difficult to control, resulting in poor consistency and stability of lithium iron phosphate, which is a big problem affecting the industrialization of lithium iron phosphate materials big bottleneck
[0010] The purpose of the present invention is to overcome the deficiencies such as uneven physical and chemical composition, large particle size and irregularity of the product existing in the preparation process of existing lithium iron phosphate, and to provide a new synthesis method, which can significantly reduce the particle size, It can effectively improve the uniformity and performance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Use high-quality ferrous nitrate as the iron source, prepare a 0.5mol / L solution with secondary water, slowly add ethanol solution of oxalic acid (0.10.5mol / L) and ammonia water to the solution, and control the adding speed to 10mL / L Min, to slowly crystallize ferric oxalate, stir continuously during the addition process, and at intervals of 3 times, 10 minutes each time; during the interval, the particles can be analyzed for particle size. When the particles are large, the feeding speed can be appropriately reduced.

[0024] 2) Control the conditions in the same way to prepare high-purity nano-scale lithium salt.

[0025] 3) Weigh the iron salt, lithium salt and phosphoric acid or ammonium phosphate prepared above in a molar ratio of 1:1:1, add 5% ethanol and 15% glucose, and add 0.1% surfactant span80, 5% Starch, so that the solution maintains a large concentration and viscosity, and stirred in a ball mill for 2 hours.

[0026] 4) The stirred slurry is freeze-drie...

Embodiment 2

[0030] 1) Use high-quality ferrous sulfate as the iron source, use secondary water to prepare a 0.3mol / L solution, slowly add oxalic acid ethanol solution (0.10.5mol / L) and ammonia water to the solution, and control the addition rate to 10mL / L Min, to slowly crystallize ferric oxalate, stir continuously during the addition process, and at intervals of 20 minutes each time; during the interval, take particles to analyze the particle size, and when the particles are large, the feeding speed can be appropriately reduced.

[0031] 2) Control the conditions in the same way to prepare high-purity nano-scale lithium salt.

[0032] 3) Take the iron salt, lithium salt and phosphoric acid or ammonium phosphate prepared above with a molar ratio of 1:1:1, add 5% ethanol and 30% sucrose, and add the required doping elements at the same time, 0.005 (molar ratio ) of nano-copper powder (average particle diameter 200nm), and add 0.5% surfactant span80, 10% starch, make the solution keep larger ...

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PUM

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Abstract

The invention discloses a novel method for preparing a lithium iron phosphate power battery anode material, which belongs to the field of novel materials and new energy resources. The method comprises the following steps of: firstly, carrying out nano processing on lithium salt and iron salt of raw materials of lithium iron phosphate, to obtain a raw material with small and uniform particles; andfurther uniformly mixing the raw materials under the action of a dispersant, a surface active agent and ball milling, preventing nonuniformity generation in the drying process by freezing and drying and preventing the growth of particles by low-temperature synthesis and high-temperature rapid crystallization so as to obtain the lithium iron phosphate anode material with small particles, uniform dispersion and stable quality.

Description

technical field [0001] The invention relates to a method for preparing a material, discloses a new method for preparing a positive electrode material of a lithium iron phosphate power battery, and belongs to the field of battery materials. Background technique [0002] At present, lithium-ion batteries, as a secondary green power source with excellent performance, have been more and more widely used in various mobile tools. The convening of the Copenhagen World Climate Conference at the end of 2009 further requires the world's awareness of environmental protection to increase day by day. As a result, the production of lead-acid batteries currently mainly used in electric vehicles has been more strictly controlled, while electric vehicles driven by high-energy secondary lithium-ion batteries and hybrid electric vehicles powered by fuel and lithium-ion batteries are becoming more and more It has been paid more and more attention by the country and large enterprises. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 严晞
Owner 成都联禾化工医药有限责任公司
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