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A preparation method of lithium iron phosphate

A lithium iron phosphate and phosphorus source technology, applied in the field of lithium-ion batteries, can solve the problems of high overall energy consumption, cumbersome operation, and a large amount of solvents, and achieve the effects of low overall energy consumption, environmental friendliness, and improved processing performance

Active Publication Date: 2019-01-11
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the operation of this method is cumbersome, requiring the use of a large amount of solvent and heating, and subsequent treatment of the tail gas is required, and the overall energy consumption is greater

Method used

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  • A preparation method of lithium iron phosphate
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  • A preparation method of lithium iron phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A preparation method of lithium iron phosphate cathode active material includes the following steps:

[0044] 723g of lithium carbonate (19.6mol), 1471.8g of iron oxide (18.4mol), and 14.9g of titanium dioxide (0.2mol) were added to the tank-type mixing and dispersing machine and mixed for 15 minutes, and then 2185.6g of ammonium dihydrogen phosphate ( 19 mol) and 240 g of glucose (added at 8 wt% of the theoretical mass of the produced lithium iron phosphate, here theoretically produced 3000 g of lithium iron phosphate), all the materials were mixed and dispersed for 15 minutes to obtain a mixture. Take out the mixed material in the trough-type mixing and dispersing machine and transfer it to the double-cone rotary vacuum dryer, vacuum the tank, adjust the vacuum in the tank to 0.08MPa, and mix and dry at a drying temperature of 150℃ 9h, get dry material. Then use a jet mill to crush and refine the obtained dry material, where the gas pressure in the jet mill is adjusted ...

Embodiment 2

[0048] A preparation method of lithium iron phosphate cathode active material includes the following steps:

[0049] Add 872.1g of lithium hydroxide (36.4mol), 2738.7g of iron oxide (34.3mol), and 93g of niobium oxide (0.7mol) into the tank-type mixing and dispersing machine for 30 minutes, and then add 4026g of ammonium dihydrogen phosphate in sequence (35 mol) and 552.2 g of glucose (added at 10 wt% of the theoretical mass of the produced lithium iron phosphate), all materials were mixed and dispersed for 20 minutes to obtain a mixture. Take out the mixed material in the trough-type mixing and dispersing machine and transfer it to the double-cone rotary vacuum dryer, vacuum the tank, adjust the vacuum in the tank to 0.06MPa, and mix and dry at a drying temperature of 200℃ 8h, get dry material. Then use a jet mill to crush and refine the obtained dry material, where the gas pressure in the jet mill is adjusted to 0.95MPa, the rotation frequency of the classification wheel is 35...

Embodiment 3

[0052] A preparation method of lithium iron phosphate cathode active material includes the following steps:

[0053] Add 1359.4g of lithium acetate (20.6mol), 3918.6g of iron sulfate (19.6mol), and 16.1g of magnesium oxide (0.4mol) into a tank-type mixing and dispersing machine for 30 minutes, and then add 2300.6g of dihydrogen phosphate in sequence Ammonium (20 mol) and 189.3 g of glucose (added at 6 wt% of the theoretical mass of the produced lithium iron phosphate), all materials are mixed and dispersed for 20 minutes to obtain a mixture. Take out the mixed material in the trough-type mixing and dispersing machine and transfer it to the double-cone rotary vacuum dryer, vacuum the tank body, adjust the vacuum degree in the tank to 0.07MPa, and mix and dry at 170℃ 8h, get dry material. Then use a jet mill to crush and refine the obtained dry material, where the gas pressure in the jet mill is adjusted to 0.9MPa, the rotation frequency of the classification wheel is 35Hz, the fe...

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Abstract

The invention provides a preparation method of a lithium iron phosphate positive electrode active material, comprising: (1) firstly mixing a lithium source, an iron source and a doped element source,then sequentially adding a phosphorus source and a carbon source, uniformly mixing to obtain a mixed material; the mixture is placed in a double-cone dryer under solvent-free conditions, and the mixture is dried in a temperature range of 150 DEG C to 400 DEG C, and that heat preservation is performed for 8-12h to obtain dry material, crushing and refine that dry material by adopting a jet mill toobtain powder particles having a primary particle size of 100-200 nm; 2, sintering that powder particle to obtain a primary sintering material under a protective atmosphere, and crushing and refine the primary sintering material by a gas flow crusher to obtain a lithium iron phosphate positive electrode active material. The preparation method comprises the following steps of: adding raw materialsrequired for synthesizing lithium iron phosphate in a certain order without using a solvent; and sintering the raw materials in one step to obtain an end product with uniform size and excellent performance. The preparation method has the advantages of simple process, low energy consumption and environment friendliness.

Description

Technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing lithium iron phosphate. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries that are increasingly showing important roles in various fields. As an important part of lithium-ion batteries, the cathode material of lithium-ion batteries determines the performance, price and development of lithium batteries. Currently, the most studied cathode material is LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiFePO 4 (Lithium iron phosphate). Among them, lithium iron phosphate cathode materials concentrate LiCoO 2 , LiNiO 2 , LiMn 2 O 4 It has the advantages of high structural stability, good safety performance, moderate working voltage, good platform characteristics, and large theoretical capacity. It has gradually become a hot spot for battery workers to compete for research. [0003] In the prior art, the liquid phase method is ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/362H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 孔令涌陈俊奇陈玲震
Owner SHENZHEN DYNANONIC
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