Preparation method of high-power lithium iron phosphate material

A lithium iron phosphate, high-power technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of restricting the industrialization development of materials, high energy consumption, long time, etc., and achieve excellent product quality stability and power performance. Good, loose synthesis effect

Inactive Publication Date: 2015-06-24
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the solvent in the system needs to be evaporated during the gel forming process adopted by this method, and the time is quite long, generally more than 8 hours, the energy consumption is large, which limits the industrialization of materials

Method used

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  • Preparation method of high-power lithium iron phosphate material
  • Preparation method of high-power lithium iron phosphate material
  • Preparation method of high-power lithium iron phosphate material

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preparation example Construction

[0033] A method for preparing a high-power lithium iron phosphate material is characterized in that the preparation steps include:

[0034] ⑴Preparation of liquid-phase rapid gelation precursor

[0035] ①According to the ratio of molar ratio lithium:iron:phosphorus=0.99-1.02:1:1, put the soluble lithium source compound, iron source compound and phosphorus source compound in the mixer, and stir at the speed of 200-1400 rpm , to form a mixed solution; add the dispersant to the mixed solution at a ratio of 5%-25% of the volume of the mixed solution and continue stirring, then add ammonia water to the mixer to adjust the pH value, and reduce the stirring speed of the mixer to below 8% of the initial speed ;Turn to 20-140 rpm, stop stirring; form a gelatinous mixture in the mixer;

[0036] ②Place the colloidal mixture in step ⑴①in a vacuum drying oven, and dry at 60°C-120°C for 4-12 hours to obtain a light yellow foam as a liquid-phase rapid gelling precursor;

[0037] ⑵ Pre-burn...

Embodiment 1

[0048] ⑴Preparation of liquid-phase rapid gelation precursor

[0049] ① Using lithium hydroxide, ferric nitrate and phosphoric acid as solute and water as solvent, respectively prepare lithium hydroxide transparent solution with lithium hydroxide content of 1.2mol / L and ferric nitrate transparent solution with ferric nitrate content of 2.2mol / L solution and a phosphoric acid transparent solution with a phosphoric acid content of 2mol / L; then put lithium hydroxide transparent solution, ferric nitrate transparent solution and phosphoric acid transparent solution into a mixer according to the molar ratio lithium: iron: phosphorus = 0.99:1:1, to mix Add Tween-80 dispersant to the mixed solution at 20% of the volume content of the solution; stir the lithium hydroxide transparent solution, ferric nitrate transparent solution, phosphoric acid transparent solution and Tween-80 dispersant at a speed of 700 rpm To form a uniform mixed solution, add ammonia water to the mixed solution, a...

Embodiment 2

[0060] ⑴Preparation of liquid-phase rapid gelation precursor

[0061] ① Using lithium acetate, ferric nitrate and phosphoric acid as solute and water as solvent, respectively prepare lithium acetate transparent solution with lithium acetate content of 2mol / L, ferric nitrate transparent solution with ferric nitrate content of 1.5mol / L and phosphoric acid content Phosphoric acid transparent solution of 2.5mol / L; then according to the molar ratio of lithium: iron: phosphorus = 1.02:1:1 lithium acetate transparent solution, iron nitrate transparent solution and phosphoric acid transparent solution are placed in the mixer, and the volume content of the mixed solution is Add 5% Tween-80 dispersant to the mixed solution; stir the lithium acetate transparent solution, ferric nitrate transparent solution, phosphoric acid transparent solution and Tween-80 dispersant into a uniform mixed solution at a speed of 200 rpm , add ammonia water in the mixed solution, adjust the pH value in the ...

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Abstract

The invention relates to a preparation method of a high-power lithium iron phosphate material. The preparation method comprises the following steps: 1. preparing a liquid-phase rapid gel forming precursor: (1) stirring a soluble lithium-source compound, an iron-source compound and a phosphorus-source compound to form a mixed solution; adding a dispersing agent into the mixed solution, adding ammonia water into a stirrer, and forming a jelly mixture in the stirrer; (2) drying the jelly mixture in the step 1 (1) to obtain the precursor; 2. pre-sintering and granulating the precursor; 3. carrying out the high-temperature heat treatment on the material. The lithium iron phosphate precursor synthesized in the liquid phase has the characteristic of small primary particle size, various raw materials are uniformly mixed on the molecular level, and various liquid-phase process parameters are controlled, so that the quality stability of the material in a same batch and among different batches can be realized; solvent evaporation is not needed, the material production cost is lowered, and the method is extremely suitable for industrial production of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, and in particular relates to a preparation method of a high-power lithium ferrous phosphate material. Background technique [0002] In order to relieve environmental pressure, countries around the world are racing to develop hybrid electric vehicles (HEVs) that use both batteries and fuel. According to market forecasts in Japan, the United States and Europe, after 2013 automotive batteries will gradually be dominated by lithium-ion batteries. In the development process of lithium-ion batteries, the cathode material has become a bottleneck restricting its large-scale application. Therefore, the production of cathode materials with superior performance and low price is a key factor in the commercialization of lithium-ion power batteries. [0003] Among many cathode materials, lithium iron phosphate (LiFePO 4 ) material has been recognized as an ideal material for lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397
CPCY02E60/10
Inventor 许寒刘兴江刘浩杰彭庆文卢志威任丽彬
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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