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Method for producing iron lithium manganese phosphate composite positive electrode material used in lithium ion battery through carbon reduction

A composite positive electrode material, lithium manganese iron phosphate technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low electronic conductivity and ion diffusion rate, low discharge voltage platform, and limit the electrochemical performance of positive electrode materials. Achieve the effects of low material cost, short production cycle and low processing cost

Inactive Publication Date: 2012-02-29
济宁市无界科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LiFePO 4 The electronic conductivity and ion diffusion rate are low, and the discharge voltage platform is low, which is close to 3.4V, which limits its electrochemical performance as a positive electrode material.

Method used

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  • Method for producing iron lithium manganese phosphate composite positive electrode material used in lithium ion battery through carbon reduction
  • Method for producing iron lithium manganese phosphate composite positive electrode material used in lithium ion battery through carbon reduction
  • Method for producing iron lithium manganese phosphate composite positive electrode material used in lithium ion battery through carbon reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take a certain amount of iron orthophosphate (FePO 4 ﹒ 2H 2 O), bake at 450°C for 5 hours, and measure the iron content by removing all crystal water in theory. Weigh the FePO with the water of crystallization removed 4 , Li 2 CO 3 、TiO 2 , Nb 2 o 5、 MnCO with a small amount of rare earth 3 , LiH 2 PO 4 , glucose, FePO 4 , Li 2 CO 3 、TiO 2 , Nb 2 o 5 , MnCO 3 , LiH 2 PO 4The molar ratio is 1.8:0.89:0.02:0.01:0.2:0.2, 12% glucose is added to the total mass of lithium carbonate and iron phosphate, and they are put into a roller mill with zirconium ball media and mixed for 5 hours, and the raw materials are mixed After uniformity, put it into the sagger and send it to the atmosphere furnace with nitrogen gas. The atmosphere furnace heats up at a rate of 300 ° C per hour. When the temperature reaches 400 ° C, it is roasted at a constant temperature for 2 hours, and then the temperature is raised again. When the temperature reaches 750 ° C Calcined at con...

Embodiment 2

[0025] Take a certain amount of iron orthophosphate (FePO 4 ﹒ 2H 2 O), bake at 450°C for 5 hours, and measure the iron content by removing all crystal water in theory. Weigh the FePO with the water of crystallization removed 4 , Li 2 CO 3 , MnCO containing a small amount of rare earth 3 , LiH 2 PO 4 , glucose, FePO 4 , Li 2 CO 3 , MnCO 3 , LiH 2 PO 4 The molar ratio is 1.8:0.875:0.2:0.2. Add 12% glucose relative to the total mass of lithium carbonate and iron phosphate, and put them into a roller mill with zirconium ball media and mix them for 5 hours. After the raw materials are mixed evenly, load Put it into the sintered sagger, and send it to the atmosphere furnace mixed with nitrogen and carbon dioxide. The atmosphere furnace heats up at a rate of 300 ° C per hour. When the temperature reaches 400 ° C, it is roasted at a constant temperature for 2 hours, and then the temperature is raised again. Roasting at the rear constant temperature for 7h, then naturally...

Embodiment 3

[0027] Take a certain amount of iron orthophosphate (FePO 4 ﹒ 2H 2 O), bake at 450°C for 5 hours, and measure the iron content by removing all crystal water in theory. Weigh the FePO with the water of crystallization removed 4 , Li 2 CO 3 、TiO 2 , Nb 2 o 5、 MnCO with a small amount of rare earth 3 , LiH 2 PO 4 , glucose, FePO 4 , Li 2 CO 3 、TiO 2 , Nb 2 o 5 , MnCO 3 , LiH 2 PO 4 The molar ratio is 1.6: 0.677: 0.02: 0.01: 0.4: 0.4. Add 12% glucose to the total mass of lithium carbonate and iron phosphate, and put it into a roller mill with zirconium ball media. Mix and grind for 5 hours until the raw materials are mixed evenly Finally, put it into the sagger and send it to the nitrogen atmosphere furnace. The atmosphere furnace heats up at a rate of 300 ° C per hour. When the temperature reaches 400 ° C, it is roasted at a constant temperature for 2 hours, and then the temperature is raised again. When the temperature reaches 770 ° C, the temperature is const...

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Abstract

The invention discloses an iron lithium manganese phosphate composite positive electrode material used in a lithium ion battery, and a preparation method thereof. The method provided by the invention is mainly aimed at improving the performance of a lithium ion battery positive electrode material. The method comprises specific steps that: a lithium source is mixed with an iron source, a manganesesource, a phosphorous source, a reducing agent, and doped elements; the mixture is subject to a reaction, such that a compound of an iron lithium manganese phosphate precursor, a lithium source, manganese phosphate, ferric phosphate, phosphate and doped elements is prepared; the compound is mixed with a lithium source and a reducing agent carbon source; and the mixture is sintered under a protective atmosphere, such that the iron lithium manganese phosphate composite positive electrode material is obtained. The method provided by the invention is advantaged in simple technology, low material cost, low production cost, short production period, and low energy consumption. The method can be applied in large-scale productions. The product prepared with the method is advantaged in high bulk density, good conductivity and high specific capacity.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material for a lithium ion battery, in particular to a method for preparing a lithium manganese iron phosphate composite positive electrode material for a lithium ion battery by carbon reduction. Background technique [0002] With the continuous expansion of the application field of lithium-ion batteries, countries all over the world, especially the governments of developed countries, and group companies are investing heavily in technology research and development and market applications. Lithium-ion battery applications range from mobile phones, notebook computers, digital cameras, MP3, video recorders and other portable electronic products to the aerospace field, and gradually move towards the field of power equipment applications and military applications. In lithium-ion batteries, the cathode material is the most important component and the key to determining the performance of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 蒋永乐蒋宁蒋永善贺兆书李俊峰
Owner 济宁市无界科技有限公司
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