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Preparation method of lithium iron phosphate

A technology of lithium iron phosphate and lithium salt, which is applied in the field of preparation of lithium iron phosphate materials, can solve the problems of poor high-rate charge and discharge performance, difficulties in practical application of materials, and large grain size of products, and achieve high-rate charge and discharge performance Good, large specific capacity, high conductivity effect

Inactive Publication Date: 2011-02-02
SHENZHEN KOTO NEW ENERGY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the grain size of the product is large, the powder is composed of irregular particles, and the conductivity is poor, and the high-rate charge and discharge performance is not good, which makes the practical application of the material difficult.

Method used

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  • Preparation method of lithium iron phosphate
  • Preparation method of lithium iron phosphate
  • Preparation method of lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 42 grams of HEDP in 100 grams of water, stir well until completely dissolved, add 80.8 grams of ferric nitrate, 1.8 grams of glucose and 8.4 grams of lithium hydroxide to mix, and at the same time heat and stir in a water bath at 100°C for 2 hours to remove water, namely Obtain lithium iron phosphate precursor. Move the precursor into a high-temperature atmosphere furnace, heat up to 400°C at a rate of 5°C / min in an atmosphere of argon, nitrogen or nitrogen-hydrogen mixture, roast at a constant temperature for 4 hours, and then raise the temperature to 600°C at the same rate, Calcined at a constant temperature for 10 hours and then cooled naturally to room temperature to obtain lithium iron phosphate, a positive electrode material for a lithium ion battery.

[0031] figure 1 is its X-ray diffraction pattern, and the obtained product is pure-phase olivine-type lithium iron phosphate. figure 2 It is the first and second charge and discharge curves of lithium i...

Embodiment 2

[0033] Dissolve 61 grams of ATMP in 100 grams of water, stir well until it is completely dissolved, add 80.8 grams of ferric citrate and 8.4 grams of lithium hydroxide to mix, and heat and stir in a water bath at 100°C for 2 hours, then remove the water to obtain ferric phosphate Lithium precursor. Move the precursor into a high-temperature atmosphere furnace, heat up to 400°C at a rate of 5°C / min in an atmosphere of argon, nitrogen or nitrogen-hydrogen mixture, roast at a constant temperature for 4 hours, and then raise the temperature to 600°C at the same rate, Calcined at a constant temperature for 10 hours and then cooled naturally to room temperature to obtain lithium iron phosphate, a positive electrode material for a lithium ion battery.

Embodiment 3

[0035] First dissolve 42 grams of HEDP in 100 grams of water, stir well until completely dissolved, add 49 grams of ferric nitrate, 1.8 grams of glucose and 8.4 grams of lithium hydroxide to mix, and at the same time heat and stir in a water bath at 100°C for 2 hours to remove water, namely Obtain lithium iron phosphate precursor. Move the precursor into a high-temperature atmosphere furnace, heat up to 400°C at a rate of 5°C / min in an atmosphere of argon, nitrogen or nitrogen-hydrogen mixture, roast at a constant temperature for 4 hours, and then raise the temperature to 600°C at the same rate, Calcined at a constant temperature for 10 hours and then cooled naturally to room temperature to obtain lithium iron phosphate, a positive electrode material for a lithium ion battery.

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Abstract

The invention discloses a preparation method of lithium iron phosphate. The preparation method comprises the following steps of: dissolving an iron salt, a lithium salt and a carbon source into aqueous solution of a phosphoric chelating agent, fully stirring the mixture, and filtering the mixture to remove water and obtain a precursor of the lithium iron phosphate; and putting the precursor into a high-temperature atmosphere furnace, heating to raise the temperature in an atmosphere with an argon gas, a nitrogen gas or a nitrogen-hydrogen gas mixture, and naturally cooling the precursor to the room temperature after constant temperature baking to obtain the lithium iron phosphate which is a lithium ion battery anode material. The lithium iron phosphate prepared by the method is suitable for a high-multiplying-power discharge power battery, and has the advantages of high conductivity, large specific capacity, high high-multiplying-power charge-discharge performance, and high electrochemical performance.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a preparation method of a lithium iron phosphate material with high-rate discharge performance. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has many advantages such as high voltage, high specific energy density, long cycle life, small self-discharge, no memory effect, and wide operating temperature range. It is widely used in mobile phones, notebook computers, digital Cameras, video cameras, electronic instruments, etc. also have bright application prospects in UPS, electric mobility tools, electric vehicles, energy storage batteries and other fields. In recent years, the output of lithium-ion batteries has grown rapidly, and the application fields have continued to expand. It has become a high-tech product that is of great significance to the national economy and people's lives in the 21st century. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
Inventor 李汝文
Owner SHENZHEN KOTO NEW ENERGY MATERIAL
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