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Method for adopting spray pyrolysis technology to prepare spherical anode material lithium iron phosphate

A spray thermal decomposition, lithium iron phosphate technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of low volume energy density, uneven particle size distribution, low tap density, etc., to achieve volume energy density High, high tap density, stable quality effect

Inactive Publication Date: 2011-08-10
江西省金锂科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the shortcomings of the current commercialized lithium iron phosphate materials such as irregular morphology, non-concentrated particle size distribution, low tap density, and low volumetric energy density, the present invention proposes the preparation of LiFePO for lithium-ion batteries by spray pyrolysis technology. 4 Cathode materials to meet the needs of the high energy density market

Method used

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  • Method for adopting spray pyrolysis technology to prepare spherical anode material lithium iron phosphate
  • Method for adopting spray pyrolysis technology to prepare spherical anode material lithium iron phosphate
  • Method for adopting spray pyrolysis technology to prepare spherical anode material lithium iron phosphate

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Embodiment 1

[0032] Lithium hydroxide monohydrate (LiOH·H 2 O) 4.194 kg, ferrous oxalate (FeC 2 o 4 2H 2 O) 18.00 kg, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 11.50 kg and 0.8 kg of sucrose are placed in a ball mill, then add 67.39 kg of deionized water and carry out ball milling to make a slurry, the ball milling time is 4 hours, then carry out ultrafine grinding, the slurry particle size is controlled at 0.8 microns, and a homogeneous mixture is obtained slurry. The above-mentioned mixed slurry is atomized into fine droplets under the pressure of 5Mpa high-purity nitrogen gas, and the droplets are calcined at 300-900° C. under a nitrogen protective atmosphere to obtain lithium iron phosphate powder.

[0033] For the SEM image of the lithium iron phosphate powder prepared in Example 1, please refer to figure 1 , please refer to the XRD diagram figure 2 .

[0034] At the same time, the lithium iron phosphate powder material prepared in Example 1 is charged and discharged. T...

Embodiment 2

[0036] Lithium dihydrogen phosphate (LiH 2 PO4) 10.39 kg, ferrous oxalate (FeC 2 o 4 2H 2 O) 18.00 kg, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 11.50 kilograms and 0.8 kilograms of glucose are placed in a ball mill, then add 67.39 kilograms of deionized water and carry out ball milling to make a slurry, the ball milling time is 4 hours, then carry out ultrafine grinding, the slurry particle size is controlled at 0.8 microns, and a homogeneous mixture is obtained slurry. The above slurry is atomized into fine droplets under a pressure of 5Mpa high-purity nitrogen gas, and the droplets are calcined at 300-900°C under a nitrogen protective atmosphere to obtain lithium iron phosphate powder.

[0037] For the SEM image of the lithium iron phosphate powder prepared in Example 2, please refer to Figure 4 , please refer to the XRD diagram Figure 5 ..

[0038] At the same time, charge and discharge tests were carried out on the lithium iron phosphate powder material pr...

Embodiment 3

[0040] Lithium dihydrogen phosphate (LiH 2 PO 4 ) 10.39 kg, iron oxide (Fe 2 o 3 ) 8.00 kg and 1.0 kg of polyvinyl alcohol are placed in a ball mill. In the present embodiment, lithium dihydrogen phosphate can be used as a lithium source and a phosphorus source at the same time, then add 47.00 kg of deionized water and carry out ball milling to make slurry. The ball milling time is 4 hour, and then carry out ultra-fine grinding, the slurry particle size is controlled to 0.8 microns, and a homogeneous mixed slurry is obtained. The above slurry is atomized into fine droplets under a pressure of 5Mpa high-purity nitrogen gas, and the droplets are calcined at 300-900°C under a nitrogen protective atmosphere to obtain lithium iron phosphate powder. The tap density of lithium iron phosphate prepared in this example reaches 1.2g / cm 3 , the specific surface area is 25m2 / g, the particle size D50 is 18 microns, and the half-cell capacity is 139mAh / g.

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Abstract

The invention relates to a method for adopting a spray pyrolysis technology to prepare spherical anode material lithium iron phosphate, which comprises the steps which are as follows: a lithium source, a phosphorus source and an organic carbon source soluble in water, and an iron source insoluble in water are mixed in a ball milling-super fine milling way by taking de-ionized water as a dispersing agent according to a certain proportion; then high purity nitrogen is used as a flow carrier gas to atomize the pulp into small drops in a high temperature reaction furnace full of nitrogen protection; finally, the small drops are calcined under the protection of the nitrogen to obtain lithium iron phosphate powder. The spherical anode material lithium iron phosphate prepared by the method has high tap density, uniform size distribution, and excellent electrochemistry performance; moreover, the surfaces of the particles are spherical porous and are suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing lithium iron phosphate, a positive electrode material for lithium ion batteries, in particular to a method for preparing spherical positive electrode material lithium iron phosphate by using spray pyrolysis technology, which belongs to the field of green energy materials. Background technique [0002] Since Goodenough et al. reported LiFePO with olivine structure in 1997 4 After it can be used as a cathode material for lithium-ion batteries, it has become one of the most potential cathode materials due to its cheap price, no pollution, no moisture absorption, and good thermal stability, and has attracted the attention of many scientific research and commercial organizations. At present, the application fields of lithium-ion batteries have begun to expand to electric vehicles, energy storage power stations, military and other large battery fields. Among the core components of lithium-ion batteries-positiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397C01B25/45
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 高旭光肖水龙罗邵滨
Owner 江西省金锂科技股份有限公司
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