Preparation method for low-temperature nanometer lithium iron phosphate cathode material

A technology of lithium iron phosphate and cathode material, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as poor low temperature performance

Active Publication Date: 2012-08-01
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the low-temperature performance of the lithium iron phosphate cathode material prepared by the current technology is poor, and to pr

Method used

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  • Preparation method for low-temperature nanometer lithium iron phosphate cathode material
  • Preparation method for low-temperature nanometer lithium iron phosphate cathode material
  • Preparation method for low-temperature nanometer lithium iron phosphate cathode material

Examples

Experimental program
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Embodiment 1

[0019] 2.55molLi 2 CO 3 , 2.5molFe 2 o 3 , 5.0mol NH 4 h 2 PO 4 Add to the mixing tank, add 2L deionized water, add 0.01molMnO while stirring 2 , 0.01molTiO 2 and 30g of glucose, stirred evenly, transferred to a ball mill, and performed a high-energy ball mill for 2 to 3 hours, and the D50 of the obtained slurry must be less than 0.1 μm. Then carry out spray drying to form powder, and sieve. put the powder in N 2 In the atmosphere, it was sintered in a rotary furnace at 350° C. for 5 hours. Cool, sieve, transfer to a ball mill jar, add 150g chitosan and 900ml deionized water, stir evenly, transfer to a ball mill, perform a second high-energy ball mill until the D50 of the slurry is less than 0.1 μm, and spray dry to form a spherical shape Powder, sieved. After the powder is subjected to airflow pulverization, it is added to the rotary kiln, and the N 2 Sinter at 650°C for 8 hours in the atmosphere, then heat up to 800°C for 20 hours, cool, sieve and obtain the prod...

Embodiment 2

[0022] 2.55molLi 2 CO 3 , 5.0molFePO 4 Add to the mixing tank, add 2L deionized water, add 0.01molMnO while stirring 2 , 0.01molTiO 2 , 0.02mol MgO and 30g glucose, stirred evenly, transferred to a ball mill, and performed a high-energy ball mill for 2 to 3 hours, and the D50 of the obtained slurry must be less than 0.1 μm. Then carry out spray drying to form powder, and sieve. put the powder in N 2 In the atmosphere, it was sintered in a rotary furnace at 350° C. for 5 hours. Cool, sieve, transfer to a ball mill jar, add 150g chitosan and 900ml deionized water, stir evenly, transfer to a ball mill, perform a second high-energy ball mill until the D50 of the slurry is less than 0.1 μm, and spray dry to form a spherical shape Powder, sieved. After the powder is subjected to airflow pulverization, it is added to the rotary kiln, and the N 2 Sinter at 650°C for 8 hours in the atmosphere, then heat up to 800°C for 20 hours, cool, sieve and obtain the product.

[0023] The...

Embodiment 3

[0025] 2.55molLi 2 CO 3 , 2.5molFe 2 o 3 , 5.0mol NH 4 h 2 PO 4 Add to the mixing tank, add 2L deionized water, add 0.01molMnO while stirring 2 , 0.01molTiO 2 and 30g of sucrose, stirred evenly, transferred to a ball mill, and carried out a high-energy ball mill for 2 to 3 hours, and the D50 of the obtained slurry must be less than 0.1 μm. Then carry out spray drying to form powder, and sieve. put the powder in N 2 In the atmosphere, it was sintered in a rotary furnace at 350° C. for 5 hours. Cool, sieve, transfer to a ball mill tank, add 180g of modified starch and 900ml of deionized water, stir evenly, transfer to a ball mill, perform a second high-energy ball mill until the D50 of the slurry is less than 0.1 μm, and spray dry to form a spherical shape Powder, sieved. After the powder is subjected to airflow pulverization, it is added to the rotary kiln, and the N 2 Sinter at 650°C for 8 hours in the atmosphere, then heat up to 800°C for 20 hours, cool, sieve and...

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Abstract

The invention discloses a preparation method for a low-temperature nanometer lithium iron phosphate cathode material. The preparation method comprises the following steps of: adding a lithium source compound, a ferric source compound, a phosphorous source compound and water according to a proportion for mixing, adding metal ion doped oxide and a primary carbon source for mixing, performing primary high-energy superfine pulverization for 2 to 3 hours, performing spray-drying to obtain powder, and performing sieving; pre-treating the powder in an inert atmosphere at the temperature of 300 to 500 DEG C for 2 to 10 hours, performing cooling, adding a secondary carbon source and water, stirring the mixture, performing secondary high-energy superfine pulverization to obtain spherical powder, and performing sieving; and performing jet milling on the spherical powder, performing treatment in the inert atmosphere at 500 to 600 DEG C for 6 to 30 hours, performing thermal treatment at the high temperature of 600 to 900 DEG C for 10 to 30 hours, and performing cooling to obtain the low-temperature nanometer lithium iron phosphate cathode material with the granularity of 60 to 70 nanometers. When the low-temperature nanometer lithium iron phosphate cathode material is used for manufacturing the anode of a lithium ion battery, the battery has high low-temperature discharge performance.

Description

technical field [0001] The invention relates to the preparation technology of lithium ion battery cathode materials, in particular to a preparation method of low-temperature nano lithium iron phosphate cathode materials. Background technique [0002] As a cathode material for lithium-ion batteries, lithium iron phosphate has the advantages of good safety performance, excellent cycle performance and environmental friendliness, and is rich in raw materials and high specific capacity (theoretical capacity is 170mAh / g, energy density is 550Wg / Kg). However, the lithium iron phosphate cathode material also has the following three problems: (1) According to its lithium ion deintercalation migration model, the ion conductivity and electronic conductivity of pure lithium iron phosphate are both low, and the electronic conductivity Se is 10 -9 s / cm order of magnitude, while the ion transmission rate Si is 10 -11 s / cm order, the two directly lead to low electrode transmission rate Sw ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/12Y02E60/10
Inventor 杨金洪王耀南章明张文新陈惠明
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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