Preparation method of lithium titanium phosphate anode material

A negative electrode material, lithium titanium phosphate technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor electrochemical performance and high production cost, and achieve stable quality, improved conductivity, and simple and easy process Effect

Active Publication Date: 2017-01-04
江西省金锂科技股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is aimed at existing LiTi 2 (PO 4 ) 3 To solve the problems of low conductivity, poor electrochemical performance and high production cost of the negative electrode material, a method for preparing a lithium titanium phosphate negative electrode material with good conductivity, excellent electrochemical performance and suitable for industrial production is provided

Method used

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  • Preparation method of lithium titanium phosphate anode material
  • Preparation method of lithium titanium phosphate anode material
  • Preparation method of lithium titanium phosphate anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 24.6 kg (236.7 mol) of lithium dihydrogen phosphate, 51.5 kg (445 mol) of ammonium dihydrogen phosphate, 36.8 kg (453.8 mol) of titanium dioxide, and 7.12 kg of beta cyclodextrin in a ball mill, and then add 180 kg of deionized water for Ball milling, ball milling time is 4 hours, makes dispersion mixture (solid content is 40%); Then with diaphragm pump, dispersion mixture is squeezed into the mixing tank of sand mill and carries out superfine grinding, high-speed sand milling 4h, makes the material The particle size is controlled between 500-800nm ​​to prepare slurry. (calculated according to the amount of lithium source, titanium source and phosphorus source, the theoretical production amount of titanium lithium phosphate is 227.25mol, 88.14Kg.)

[0031] The resulting slurry was placed in a spray dryer for spray granulation, keeping the inlet temperature at 200-250° C. and the outlet temperature at 100° C. to obtain 108 kg of the initial precursor. Then 108 kg of...

Embodiment 2

[0037] 9.90 kilograms (233.7mol) of lithium hydroxide, 8.72 kilograms (75.6mol, diluted with 20 kilograms of deionized water before mixing), 70.04 kilograms of ammonium dihydrogen phosphate (605.12mol ), 36.8 kilograms (453.8mol) of titanium dioxide, and 8 kilograms of maltodextrin are placed in a ball mill, and then 175 kilograms of deionized water are added to carry out ball milling. The ball milling time is 4 hours to make a dispersion mixture (solid content is 40%). Then use a diaphragm pump to pump the dispersed mixture into the sand mill mixing tank of the sand mill for ultra-fine grinding, high-speed grinding for 4 hours, so that the particle size of the material is between 500-800nm, and the slurry is obtained.

[0038]The resulting slurry was placed in a spray dryer for spray granulation, keeping the inlet temperature at 200-250° C. and the outlet temperature at 100° C. to obtain 108 kg of the initial precursor. Then, 108 kg of the initial precursor and 10 kg of gluco...

Embodiment 3

[0043] Put 24.8 kg (238.3 mol) of lithium dihydrogen phosphate, 51.2 kg (442.5 mol) of ammonium dihydrogen phosphate, 36.8 kg (453.8 mol) of titanium dioxide, 3Kg of beta-cyclodextrin, 1Kg of phenolic resin and 0.587Kg of carbon black in a ball mill , then add 121.5 kilograms of deionized water and carry out ball milling, and the ball milling time is 10 hours to make a dispersion mixture (solid content is 50%); then the dispersion mixture is squeezed into the mixing tank of the sand mill with a diaphragm pump and carried out ultrafine grinding , high-speed sanding for 1 hour, so that the particle size of the material is controlled between 500-800nm, and the slurry is prepared. (calculated based on the amount of lithium source, titanium source and phosphorus source, the theoretical production amount of titanium lithium phosphate is 226.9mol, 88.0Kg.)

[0044] The resulting slurry was placed in a spray dryer for spray granulation, keeping the inlet temperature at 370-400° C. and...

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Abstract

The invention belongs to the technical field of green energy source material, and more specifically relates to a preparation method of a lithium titanium phosphate anode material of lithium ion batteries taking an aqueous solution as the electrolyte. According to the preparation method, a primary carbon source with a relatively high glass transition temperature is added into a slurry so as to avoid adhering on the wall in spray drying process caused by adding of an organic carbon source completely; carbon sources are added in two times, a secondary carbon source is added in a second time after an initial precursor is formed, and the secondary carbon source is mixed with the initial precursor at a high speed, adoption of composite carbon sources is capable of achieving excellent carbon coating effect on the surface of lithium titanium phosphate; electrical conductivity among the LiTi2(PO4)3 particles is increased via coating by the secondary carbon source, the electrical conductivity of LiTi2(PO4)3 is increased obviously, and carbon coated LiTi2(PO4)3 possesses excellent cycling stability in aqueous electrolyte. The production process is continuous; product characteristics are uniform; quality is stable; the preparation method is simple and convenient, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of green energy materials, in particular to a preparation method of a lithium titanium phosphate negative electrode material used for a lithium ion battery using an aqueous solution as an electrolyte. Background technique [0002] At present, most of the negative electrode materials of lithium-ion batteries use various lithium-intercalated carbon materials. However, the potential of the carbon electrode is very close to that of metal lithium. When the battery is overcharged, metal lithium is easy to precipitate on the surface of the carbon electrode, forming dendrites and causing a short circuit; when the temperature is too high, it is easy to cause thermal runaway. At the same time, the repeated intercalation and deintercalation of lithium ions will damage the structure of the carbon material, resulting in capacity attenuation. Therefore, it is very necessary to find new anode materials that can intercalat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 杨安臣
Owner 江西省金锂科技股份有限公司
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