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Method for preparing lithium iron phosphate positive electrode material by taking pickling iron oxide red as raw material

A cathode material, a technology for lithium iron phosphate, which is applied in the field of preparation of lithium iron phosphate cathode materials, can solve the problems of unsuitable large-scale production, cumbersome processing of iron red, etc., to alleviate the energy and environmental crisis, high rate performance, and simple preparation process. Effect

Active Publication Date: 2019-07-16
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although this method can make the processed iron red easy to prepare high-quality lithium iron phosphate, the treatment of iron red is extremely cumbersome and is not suitable for large-scale industrial production.

Method used

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  • Method for preparing lithium iron phosphate positive electrode material by taking pickling iron oxide red as raw material
  • Method for preparing lithium iron phosphate positive electrode material by taking pickling iron oxide red as raw material
  • Method for preparing lithium iron phosphate positive electrode material by taking pickling iron oxide red as raw material

Examples

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Effect test

Embodiment 1

[0078] In this example, the lithium iron phosphate positive electrode material was prepared using pickled iron red as a raw material according to the following method:

[0079] (1) Accurately weigh pickling iron red 500g, battery grade lithium carbonate 237.5g, and battery grade ammonium dihydrogen phosphate 718.8g, citric acid 401.3g and aluminum isopropoxide 50g, add deionized water in the stirring mill, Add the raw materials of the above quality into the ball mill for 4 hours in order, add an appropriate amount of deionized water to the mixed material, and adjust the solid-liquid ratio of the uniform slurry to 95%. Subsequently, the slurry was dried in an oven at 120° C. for 24 h.

[0080] (2) Under a nitrogen atmosphere, raise the temperature from room temperature to 350°C at a heating rate of 5°C / min, keep the temperature for 8 hours, cool to room temperature and pulverize, then raise the heating rate to 750°C at a heating rate of 5°C / min, and keep it for 10 hours. After...

Embodiment 2

[0084] In this example, the lithium iron phosphate positive electrode material was prepared using pickled iron red as a raw material according to the following method:

[0085] (1) Accurately weigh pickling iron red 500g, battery grade lithium carbonate 237.5g, and battery grade ammonium dihydrogen phosphate 718.8g, citric acid 401.3g and ammonium chloride 18.8g respectively, add deionized water in the stirring mill, Add the raw materials of the above quality and ball mill for 4 hours in sequence, add an appropriate amount of deionized water to the mixed material, and adjust the solid-to-liquid ratio of the homogeneous slurry to 25%. Subsequently, the slurry was placed in an oven and dried at 120° C. for 24 hours to obtain a mixture.

[0086] (2) Under a nitrogen atmosphere, the mixture prepared in step (1) was raised from room temperature to 350°C at a heating rate of 5°C / min, kept for 8 hours, cooled to room temperature, and pulverized, and then heated again at a heating rat...

Embodiment 3

[0093] In this example, the lithium iron phosphate positive electrode material was prepared using pickled iron red as a raw material according to the following method:

[0094] (1) Accurately weigh pickling iron red 500g, battery grade lithium carbonate 237.5g, and battery grade ammonium dihydrogen phosphate 718.8g, citric acid 401.3g and sodium carbonate 18.8g respectively, add deionized water in the stirring mill, according to Sequentially add the raw materials of the above quality and ball mill for 4 hours, add an appropriate amount of deionized water to the mixed material, and adjust the solid-to-liquid ratio of the homogeneous slurry to 25%. Subsequently, the slurry was dried in an oven at 120° C. for 24 h.

[0095] (2) Under an argon atmosphere, raise the temperature from room temperature to 350°C at a rate of 5°C / min, keep it warm for 8 hours, cool to room temperature and pulverize it, then raise it to 750°C at a rate of 5°C / min, and keep it warm for 10 hours , after c...

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Abstract

The invention provides a method for preparing a lithium iron phosphate positive electrode material by taking pickling iron oxide red as a raw material. The method comprises the steps of (1) mixing a lithium source, an iron source, a phosphate source and a carbon source to obtain a mixed material, wherein the iron source comprises the pickling iron oxide red; and (2) sintering the mixed material the step (1) under a protection gas to obtain a carbon-coated lithium iron phosphate positive electrode material. The product pickling iron oxide red is recycled by utilizing a pickling waste liquid andis used as the iron source, and the carbon-coated LiFePO4 positive electrode material is prepared by a carbon thermal reduction method; and meanwhile, the electrochemical performance of the lithium iron phosphate positive electrode material is improved by metal and non-metal ion doping on a product, the production cost of the carbon-coated LiFePO4 positive electrode material is reduced, and larger utilization space can be brought for industrial production. Moreover, the method is simple in preparation process and high in controllability and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a method for preparing a positive electrode material, in particular to a method for preparing a lithium iron phosphate positive electrode material by using pickled iron red as a raw material. Background technique [0002] With the rapid development of the world economy, the rapid consumption of energy and environmental pollution have become important factors that hinder the development of countries all over the world. For this reason, the development of clean and efficient energy storage devices is particularly critical. Lithium-ion batteries have the advantages of high energy density, clean and efficient, long life, safety and reliability. Among them, the cathode material of lithium-ion batteries is one of the important factors affecting lithium-ion batteries. Among the many cathode materials for lithium-ion batteries, olivine-structured LiFePO 4 Cathode material has ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 罗绍华侯鹏庆刘欢冯建李鹏伟赵鑫王庆张亚辉刘延国王志远刘宣文郭瑞郝爱民
Owner 东北大学秦皇岛分校
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