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Method for preparing lithium iron phosphate with high rate discharge by using ultrasonic coprecipitation

A discharge rate, lithium iron phosphate technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems that affect the high rate performance of materials, it is difficult to control the particle size and particle size distribution of precursors, and achieve good electrochemical performance , low cost and low energy consumption

Inactive Publication Date: 2010-08-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is difficult to control the particle size and particle size distribution of the precursor during the co-precipitation process, which ultimately affects the high-rate performance of the material.

Method used

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  • Method for preparing lithium iron phosphate with high rate discharge by using ultrasonic coprecipitation
  • Method for preparing lithium iron phosphate with high rate discharge by using ultrasonic coprecipitation
  • Method for preparing lithium iron phosphate with high rate discharge by using ultrasonic coprecipitation

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Effect test

Embodiment 1

[0026] 1) preparation concentration is the ferrous ammonium sulfate aqueous solution of 0.5mol / L, the concentration is that the ammonium dihydrogen phosphate aqueous solution of 0.5mol / L and the lithium hydroxide aqueous solution that concentration is 1mol / L;

[0027] 2) the ferrous ammonium sulfate aqueous solution, the ammonium dihydrogen phosphate aqueous solution and the lithium hydroxide aqueous solution in the step 1) in N 2 Add it into the reaction kettle for co-precipitation, stir and carry out ultrasonic treatment at the same time, the temperature is 30 °C, the molar ratio of ferrous ammonium sulfate, ammonium dihydrogen phosphate and lithium hydroxide is 1:1:1; the ultrasonic treatment time is 5 hours , the frequency of ultrasonic treatment is 28KHz, the power is 120W, filtered to get LiFePO 4 Precursor;

[0028] 3) LiFePO obtained in step 2) 4 The precursor and starch were added to water and mixed to obtain a mixed solution, and then the mixed solution was ultraso...

Embodiment 2

[0033] 1) preparation concentration is the ferrous ammonium sulfate aqueous solution of 0.1mol / L, the concentration is the lithium dihydrogen phosphate aqueous solution of 0.1mol / L and the concentration is the lithium hydroxide aqueous solution of 0.2mol / L;

[0034] 2) Mix the ferrous ammonium sulfate aqueous solution, lithium dihydrogen phosphate aqueous solution and lithium hydroxide aqueous solution in step 1) in 1%~10%H 2 Under argon gas, add it into the reaction kettle for co-precipitation, stir and carry out ultrasonic treatment at the same time, the temperature is 50 ° C, the molar ratio of ferrous ammonium sulfate, lithium dihydrogen phosphate and lithium hydroxide is 1:1:1; For 12 hours, the frequency of ultrasonic treatment is 28KHz, the power is 50W, and LiFePO is obtained by filtration 4 Precursor;

[0035] 3) LiFePO obtained in step 2) 4 The precursor and sucrose were added to water and mixed to obtain a mixed solution, and then the mixed solution was ultrasonic...

Embodiment 3

[0039] 1) preparation concentration is the ferrous sulfate aqueous solution of 0.8mol / L, the concentration is the diammonium hydrogen phosphate aqueous solution of 0.8mol / L and the concentration is the lithium hydroxide aqueous solution of 0.24mol / L;

[0040] 2) the ferrous sulfate aqueous solution, the diammonium hydrogen phosphate aqueous solution and the lithium hydroxide aqueous solution in the step 1) in N 2 Add it into the reactor for co-precipitation, stir and carry out ultrasonic treatment at the same time, the temperature is 50 ° C, the molar ratio of ferrous sulfate, diammonium hydrogen phosphate and lithium hydroxide is 1: 1: 1; the ultrasonic treatment time is 5 hours, The frequency of ultrasonic treatment is 50KHz, the power is 120W, and LiFePO is obtained by filtration 4 Precursor;

[0041] 3) LiFePO obtained in step 2) 4 The precursor and polyethylene glycol-30000 were added to water and mixed to obtain a mixed solution, and then the mixed solution was ultraso...

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Abstract

The invention relates to a method for preparing lithium iron phosphate with high rate discharge by using ultrasonic coprecipitation, belonging to the technical field of energy source materials. The method comprises the following steps of: adding a ferrous source water solution, a phosphorus water solution and a lithium source water solution into a reaction kettle under a non-oxidizing atmosphere for coprecipitation, stirring and ultrasonic-processing to obtain a LiFePO4 precursor; adding the LiFePO4 precursor and a carbon source compound into water and mixing to obtain a mixture of the carbon source compound and LiFePO4, i.e. a final LiFePO4 precursor; merging the mixture into a tubular furnace for processing to obtain nanometer carbon coated LiFePO4. In the invention, the obtained nanometer carbon coated LiFePO4 has high rate charge, favorable electrochemical property and uniform grain diameter size distribution. The invention has the advantages of low cost, simple process route and low energy consumption.

Description

technical field [0001] The invention relates to a method for preparing lithium iron phosphate with high discharge rate synthesized by ultrasonic co-precipitation, which belongs to the technical field of energy materials, and specifically relates to a nano-carbon-coated LiFePO synthesized by ultrasonic-assisted co-precipitation with high discharge rate 4 Methods. Background technique [0002] In recent years, the application of portable power sources has brought continuous R&D impetus to advanced energy storage devices, especially for sustainable, environment-friendly power sources. With the advent of the era of automobile popularization, the air pollution and greenhouse effect brought by automobile exhaust have brought unprecedented pressure on the earth's climate and environment, which has aroused the attention of governments of various countries to global climate and environment issues. Electric vehicles (including hybrid and pure electric vehicles) powered by secondary b...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 曹传宝刘又勇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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