Nano lithium iron phosphate material and preparation method thereof

A lithium iron phosphate, nano-technology, applied in the field of nano-lithium iron phosphate materials and its preparation, can solve the problems of difficult electrode processing and low tap density, and achieve good cycle performance, good rate performance, and high charge and discharge capacity.

Inactive Publication Date: 2009-09-30
SHENZHEN DYNANONIC
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] U.S. Patent Application No. US2003 / 0077514 A1 discloses a method for manufacturing lithium iron phosphate. The method uses ferric salt as raw material, doping metal ions on the iron site, and mixing carbon materials in the raw material, which has excellent high-rate charge and discharge. characteristics, but due to the addition of more carbon black in the material, the tap density is low, which brings difficulties to the processing of the electrode to be produced

Method used

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Embodiment approach

[0008] Technical embodiment of the present invention is as follows:

[0009] (1) take by weighing certain quality lithium source, iron source, phosphate source, doping element compound by stoichiometric ratio and be dissolved in the aqueous solution containing complexing agent;

[0010] (2) adding certain additives to the carbon nanotubes and dispersing them into the aqueous solution by ultrasonic waves, and mixing with the aqueous solution described in (1);

[0011] (3) heating the obtained mixed aqueous solution at 100-200° C. for 1-2 hours under nitrogen gas flow to obtain a gel;

[0012] (4) Sinter the obtained gel at 500-900°C under an inert atmosphere, and keep the temperature at the sintering temperature for 3-16 hours to obtain powder LiFePO 4 Material.

[0013] The lithium source includes: one or more of lithium dihydrogen phosphate, lithium hydroxide, lithium carbonate, lithium nitrate, lithium chloride;

[0014] The iron source includes: one or more of ferric pho...

Embodiment 1

[0026] Take by weighing 29.2g ethylenediaminetetraacetic acid (EDTA) and put into 500ml water, heat, add a small amount of ammonia water and make it dissolve, add 40.4g ferric nitrate (molecular formula Fe(NO 3 ) 3 9H 2 O, 0.1mol), then add 3.75g aluminum nitrate (molecular formula Al(NO 3 ) 3 9H 2 O), add 11.5g ammonium dihydrogen phosphate (molecular formula NH 4 h 2 PO 4 , 0.1mol), with 3.7g lithium carbonate (molecular formula Li 2 CO 3 , 0.05mol) was first dissolved with nitric acid, and added to the above solution; 10g of polyvinyl alcohol was weighed and dissolved in 100g of water, and 1g of single-walled carbon nanotubes were added, ultrasonically dispersed for 10min, and the carbon nanotube dispersion was also added to the above solution; The mixed solution was heated at 100-200° C. for 2 hours under the protection of nitrogen to obtain a colloid, and the obtained colloid was sintered in a nitrogen atmosphere furnace at 700° C., and kept at 700° C. for 7 hours...

Embodiment 2

[0028] Take by weighing 34.2g sucrose, dissolve with 500ml water, add 40.4g ferric nitrate (molecular formula Fe(NO 3 ) 3 9H 2 O, 0.1mol), add 1.9g aluminum nitrate (molecular formula Al(NO 3 ) 3 9H 2 O), add 11.5g ammonium dihydrogen phosphate (molecular formula NH 4 h 2 PO 4 , 0.1mol), with 3.7g lithium carbonate (molecular formula Li 2 CO 3 , 0.05mol) was first dissolved with nitric acid, and added to the above solution; 10g of polyvinyl alcohol was weighed and dissolved in 100g of water, 1g of double-walled carbon nanotubes were added, ultrasonically dispersed for 10min, and the carbon nanotube dispersion was also added to the above solution Heating the mixed solution at 100-200°C for 2 hours under the protection of nitrogen to obtain a colloid, sintering the obtained colloid in a nitrogen atmosphere furnace at 650°C, and keeping the temperature at 650°C for 9 hours to obtain nano-lithium iron phosphate.

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Abstract

The invention relates to a nano lithium iron phosphate material and a preparation method thereof. A lithium source, an iron source, a phosphate radical source and a doped element compound are dissolved in water solution containing a complexing agent according to a stoichimetric proportion and added with high-conductive carbon nano tubes scattered by assistant to form a cladding material, the obtained solution is sintered in an inert atmosphere furnace, the reaction temperature is between 500 and 900 DEG C, and the reaction time is 3 to 16 hours. The method effectively controls the chemical components, phase components and grain diameters of LiFePO4; and the obtained lithium iron phosphate is the nano lithium iron phosphate clad by the carbon nano tubes, has fine and even grains with high purity, high charge / discharge capacity, good multiplying power performance and good cycle performance, and is an ideal material for manufacturing lithium ion batteries.

Description

technical field [0001] The invention relates to a lithium iron phosphate material and a preparation method thereof, in particular to a nanometer lithium iron phosphate material with carbon nanotubes as a coating material and a preparation method thereof. Background technique [0002] In 1997, the Goodenough group [A.K.Padhi, K.S.Nanjundaswamy, J.B.Goodenough, J.Electrochem.Soc, 144 (1997)] reported for the first time that lithium iron phosphate with an olivine structure can reversibly intercalate and deintercalate lithium ions, which has aroused people's great interest. big concern. LiFePO 4 The material has the characteristics of non-toxic, non-polluting, good safety performance, wide source of raw materials, high capacity (theoretical capacity is 170mAh / g, energy density 550Wh / Kg), good stability, etc. It is the most potential for development and application A new generation of cathode materials for lithium-ion batteries has broad application prospects and great market d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/04C01B25/45B22F1/02B01J19/00
CPCY02E60/12Y02E60/10
Inventor 孔令涌何艳艳吉学文王允实任诚黄蓉
Owner SHENZHEN DYNANONIC
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