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Preparation method for spherical LiMnPO4 anode material

A technology of lithium manganese phosphate, cathode material, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of limited phase purity, high energy consumption, poor product performance, etc.

Inactive Publication Date: 2013-04-17
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electronic conductivity of lithium manganese phosphate is worse than that of lithium iron phosphate. Studies have shown that the synthesis method has an important impact on the structure and properties of the product. Therefore, it is necessary to develop new methods to prepare LiMnPO 4 Materials become one of the important ways to improve their performance
Currently used to prepare LiMnPO 4 The method is mainly the traditional solid-phase method, which is simple and quick, but the mixing is uneven, the raw materials are heated unevenly, the particle size of the product is uneven, the purity of the phase is limited, the cost is high, the energy consumption is high, and the product performance is poor.

Method used

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  • Preparation method for spherical LiMnPO4 anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) The three raw materials of manganese acetate, phosphoric acid and lithium hydroxide according to Mn: Li: PO 4 =1:1:1 molar ratio is added to deionized water, wherein the molar concentration of Mn in the mixed solution is 1mol / L, stirred to make it evenly mixed.

[0019] 2) Adding 8% sucrose in mass ratio as an organic carbon source to the obtained mixed liquid, stirring to make it evenly mixed.

[0020] 3) The obtained mixed liquid is sprayed and pyrolyzed through a spray dryer, and the inlet temperature is controlled to be 220° C., and the outlet temperature is 120° C. to obtain a lithium manganese phosphate precursor powder uniformly mixed with materials.

[0021] 4) The obtained lithium manganese phosphate precursor powder was put into a crucible, placed in a microwave sintering furnace, and heated at 1 kW for 3 hours to obtain a spherical lithium manganese phosphate positive electrode material with good crystallinity and uniform phase.

[0022] The present inven...

Embodiment 2

[0024] 1) The three raw materials of manganese acetate, phosphoric acid and lithium hydroxide according to Mn: Li: PO 4 =1:1:1 molar ratio is added to deionized water, wherein the molar concentration of Mn in the mixed solution is 1mol / L, stirred to make it evenly mixed.

[0025] 2) Adding 10% sucrose by mass ratio as an organic carbon source to the obtained mixed liquid, stirring to make it evenly mixed.

[0026] 3) Spray pyrolyze the obtained mixed solution through a spray dryer (control the inlet temperature at 220° C. and the outlet temperature at 120° C.) to obtain lithium manganese phosphate precursor powder uniformly mixed with materials.

[0027] 4) The obtained lithium manganese phosphate precursor powder was put into a crucible, placed in a microwave sintering furnace, and heated at 2 kW for 2 hours to obtain a spherical lithium manganese phosphate positive electrode material with good crystallinity and uniform phase.

Embodiment 3

[0029] 1) The three raw materials of manganese acetate, phosphoric acid and lithium hydroxide according to Mn: Li: PO 4 =1:1:1 molar ratio is added to deionized water, wherein the molar concentration of Mn in the mixed solution is 1mol / L, stirred to make it evenly mixed.

[0030] 2) Adding 12% sucrose by mass ratio as an organic carbon source to the obtained mixed liquid, stirring to make it evenly mixed.

[0031] 3) Spray pyrolyze the obtained mixed solution through a spray dryer (control the inlet temperature at 220° C. and the outlet temperature at 120° C.) to obtain lithium manganese phosphate precursor powder uniformly mixed with materials.

[0032] 4) The obtained lithium manganese phosphate precursor powder was put into a crucible, placed in a microwave sintering furnace, and heated at 3 kW for 1 hour to obtain a spherical lithium manganese phosphate positive electrode material with good crystallinity and uniform phase.

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Abstract

The invention relates to the preparation technology for anode materials for lithium ion batteries, in particular to a preparation method for a spherical LiMnPO4 anode material. The preparation method is characterized by including steps as follows: (1) adding three raw materials of an Mn compound, a P compound and an Li compound into deionized water; (2) adding a dissolved organic carbon source; (3) subjecting the obtained mixed liquor to spray pyrolysis through a spray dryer to obtain LiMnPO4 precursor powder with materials evenly mixed; and (4), heating for 2-3h at 1-3kW. The invention provides a new method for preparing the spherical LiMnPO4 anode material. The raw materials are evenly mixed and dispersed in the solution; then the spray pyrolysis method is adopted for sedimentation to guarantee even mixing of the raw materials; the prepared spherical LiMnPO4 anode material is even in particle size, primary particles are nanoscale and secondary particles are micron-sized; the electrical conductivity of the material can be improved effectively; and the cycle performance and the stability of LiMnPO4 are improved.

Description

technical field [0001] The invention relates to the preparation technology of positive electrode materials of lithium ion batteries, in particular to a method for preparing spherical lithium manganese phosphate positive electrode materials. Background technique [0002] In lithium-ion batteries, the cathode material is the most important component and the key to determining the performance of lithium-ion batteries. Lithium manganese phosphate material has the characteristics of high voltage of 4.1V, stability in the air, good safety, environmental friendliness, and wide source of raw materials. Among them, lithium, manganese, and phosphorus are all elements with abundant reserves on the earth, and the price is low. The low cost can be kept in the mass usage of the battery. Moreover, manganese compounds have been used in the battery industry for a long time, and manganese compounds have rich experience in processing and recycling, which will not cause great pollution to the ...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/10
Inventor 王少卿郭彩霞
Owner IRICO
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