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Method for preparing lithium manganese phosphate positive material of lithium battery by spray pyrolysis

A technology of lithium manganese phosphate and cathode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of inability to effectively control the particle size and phase composition of lithium manganese phosphate, and achieve good electrochemical performance, fine and uniform particles, and purity. high effect

Active Publication Date: 2013-03-27
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the particle size and phase composition of lithium manganese phosphate cannot be effectively controlled in the prior art, and provides a preparation method of lithium manganese phosphate cathode material, which can effectively control the particle size and phase composition of lithium manganese phosphate, and improve The electrical conductivity of the material improves its electrochemical performance

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  • Method for preparing lithium manganese phosphate positive material of lithium battery by spray pyrolysis

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Embodiment 1

[0024] A method for preparing lithium manganese phosphate lithium cathode material by spray pyrolysis, comprising the following process steps:

[0025] A. Weigh the lithium source compound, the manganese source compound, the phosphorus source compound and the carbon source compound in a molar ratio of 1:1:1:0.01, dissolve them in deionized water, alcohol, amyl alcohol or acetone to make their solid content be 10%, stir evenly to obtain mixed slurry;

[0026] B. Perform high-temperature spray pyrolysis of the mixed slurry obtained in step A in an inert atmosphere in a spray pyrolysis furnace at 350° C. to obtain lithium manganese phosphate precursor powder;

[0027] C. Put the lithium manganese phosphate precursor powder obtained in step B in an inert atmosphere protection furnace, bake at 500° C. for 2 hours, and cool naturally to obtain a lithium manganese phosphate lithium cathode material.

Embodiment 2

[0029] A method for preparing lithium manganese phosphate lithium cathode material by spray pyrolysis, comprising the following process steps:

[0030] A. Weigh the lithium source compound, the manganese source compound, the phosphorus source compound and the carbon source compound in a molar ratio of 1.05:1:1:0.5, dissolve them in deionized water, alcohol, pentanol or acetone to make their solid content be 60%, stir evenly to obtain mixed slurry;

[0031] B. Perform high-temperature spray pyrolysis of the mixed slurry obtained in step A in an inert atmosphere in a spray pyrolysis furnace at 650° C. to obtain lithium manganese phosphate precursor powder;

[0032] C. Place the lithium manganese phosphate precursor powder obtained in step B in an inert atmosphere protection furnace, bake at 850° C. for 6 hours, and cool naturally to obtain a lithium manganese phosphate lithium cathode material.

Embodiment 3

[0034] A method for preparing lithium manganese phosphate lithium cathode material by spray pyrolysis, comprising the following process steps:

[0035] A. Weigh the lithium source compound, the manganese source compound, the phosphorus source compound and the carbon source compound in a molar ratio of 1.03:1:1:0.26, dissolve them in deionized water, alcohol, amyl alcohol or acetone to make their solid content be 35%, stir evenly to obtain mixed slurry;

[0036] B. Perform high-temperature spray pyrolysis of the mixed slurry obtained in step A in an inert atmosphere in a spray pyrolysis furnace at 500° C. to obtain lithium manganese phosphate precursor powder;

[0037] C. Place the lithium manganese phosphate precursor powder obtained in step B in an inert atmosphere protection furnace, bake at 675° C. for 4 hours, and cool naturally to obtain a lithium manganese phosphate lithium cathode material.

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Abstract

The invention relates to a method for preparing a lithium manganese phosphate positive material of a lithium battery by spray pyrolysis and belongs to the technical field of the positive materials of lithium batteries. According to the method, homogeneous nucleation of lithium manganese phosphate is promoted through the high-temperature spray pyrolysis under the condition of an inert atmosphere, so as to reduce the temperature and the time of the follow-up reaction to obtain the lithium manganese phosphate positive material with excellent electrochemical performance. The method disclosed by the invention is simple; and since raw materials are mixed in molecular ion level and the temperature and the time of the follow-up reaction are reduced after the high-temperature spray pyrolysis, the obtained lithium manganese phosphate material has the advantages of high purity, complete crystal structure, fine and uniform particles and the excellent electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium battery, more specifically, the invention relates to a preparation method of a lithium manganese phosphate lithium positive electrode material by spray pyrolysis, which belongs to the technical field of lithium battery positive electrode materials. Background technique [0002] Lithium-ion battery, as a new type of green battery, has developed rapidly since it came out. At present, the development and application of positive electrode materials for lithium-ion batteries mainly include lithium cobaltate, lithium manganate, nickel-cobalt lithium manganate and lithium iron phosphate, and these positive electrode materials are more or less insufficient. It is becoming more and more important to develop cathode materials with high energy density, good safety and excellent cycle performance. Among them, olivine-type LiMnPO 4 The material has a theoretical specific c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 郑威吴仕明朱睿王珂
Owner DONGFANG ELECTRIC CORP LTD
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