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A preparation method of lithium iron phosphate positive electrode active material and the prepared lithium iron phosphate positive electrode active material

A positive electrode active material, lithium iron phosphate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of unsatisfactory specific capacity and volume energy, low compaction density of lithium iron phosphate positive electrode active material, etc.

Active Publication Date: 2015-12-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the technical problems of low compaction density and unsatisfactory specific capacity and volume energy of the lithium iron phosphate cathode active material synthesized by the existing hydrothermal method, the present invention provides a high compaction density, higher specific capacity and volume energy Lithium iron phosphate positive electrode active material and preparation method thereof

Method used

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  • A preparation method of lithium iron phosphate positive electrode active material and the prepared lithium iron phosphate positive electrode active material
  • A preparation method of lithium iron phosphate positive electrode active material and the prepared lithium iron phosphate positive electrode active material
  • A preparation method of lithium iron phosphate positive electrode active material and the prepared lithium iron phosphate positive electrode active material

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Embodiment 1

[0044] This example illustrates the preparation of the lithium iron phosphate positive electrode active material provided by the present invention.

[0045] Weigh 30mol ferrous sulfate heptahydrate (purity 100wt%), 30mol phosphoric acid (purity 85wt%), 0.075mol cetyltrimethylammonium bromide (Tianjin Damao Chemical Reagent Factory) and 40kg deionized water and mix well To obtain a mixed solution, weigh 90 mol of lithium hydroxide monohydrate (purity 100wt%) and 30 kg of deionized water and mix them uniformly, then add them to the mixed solution at 120° C., and react for 30 minutes to obtain solution A.

[0046] Weigh 30mol ferrous sulfate heptahydrate (purity 100wt%), 30mol phosphoric acid (purity 85wt%), 0.075mol sodium dodecylbenzenesulfonate (Tianjin Kemiou Chemical Reagent Co., Ltd.) and 40kg deionized water and mix well , Weighed 90mol of lithium hydroxide monohydrate (purity 100wt%) and 30kg of deionized water and mixed them evenly, then added to the above mixed solution...

Embodiment 2

[0051] This example illustrates the preparation of the lithium iron phosphate positive electrode active material provided by the present invention.

[0052] The positive electrode active material S2 was prepared by the same method as in Example 1, the different cationic surfactant was laurate quaternary ammonium salt, and the anionic surfactant was lauryl glyceryl ether carboxylate.

[0053] The SEM photos (magnified 2000 times and 50000 times) of the above-mentioned lithium iron phosphate composite material sample S2 obtained by using the SSX-550 scanning electron microscope produced by Shimadzu, Japan are as follows: image 3 and Figure 4 shown. From image 3 and Figure 4 It can be seen from the SEM photo that there is obvious agglomeration phenomenon between the particles, and the secondary particles are obvious. Due to the obvious reason for the agglomeration, and the close contact between the particles, the gap between the primary particles becomes smaller and less ...

Embodiment 3

[0055] This example illustrates the preparation of the lithium iron phosphate positive electrode active material provided by the present invention.

[0056] Weigh 30mol ferrous sulfate heptahydrate (purity 100wt%), 30mol phosphoric acid (purity 85wt%), 0.075mol cetyltrimethylammonium bromide (Tianjin Damao Chemical Reagent Factory) and 40kg deionized water and mix well To obtain a mixed solution, weigh 90 mol of lithium hydroxide monohydrate (purity 100wt%) and 30 kg of deionized water and mix them uniformly, then add them to the mixed solution at 50° C., and react for 30 minutes to obtain solution A.

[0057] Weigh 30mol ferrous sulfate heptahydrate (purity 100wt%), 30mol phosphoric acid (purity 85wt%), 0.075mol sodium dodecylbenzenesulfonate (Tianjin Kemiou Chemical Reagent Co., Ltd.) and 40kg deionized water and mix well , Weighed 90mol of lithium hydroxide monohydrate (purity 100wt%) and 30kg of deionized water, mixed evenly, added to the above mixed solution at 50°C, and ...

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Abstract

The invention provides a lithium iron phosphate anode active material and a preparation method thereof. The preparation method of the lithium iron phosphate anode active material comprises the following steps: allowing a first phosphorus source, a first iron source and a cationic surfactant to contact with a first lithium source to obtain a solution A, allowing a second phosphorus source, a second iron source and an anionic surfactant to contact with a second lithium source to obtain a solution B, and reacting the solution A with the solution B at a high temperature under a high pressure to obtain lithium iron phosphate. The method is simple and can be easily realized, and the prepared anode active material has the advantages of high compacted density, high specific capacity and high volume energy.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and more specifically relates to a method for preparing a lithium iron phosphate positive electrode active material and the prepared lithium iron phosphate positive electrode active material. Background technique [0002] As a chemical power source with high specific capacity, lithium-ion batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields. preferred. [0003] Lithium iron phosphate (LiFePO 4 ) is a research hotspot of positive electrode active materials for lithium-ion batteries. Preliminary studies have shown that LiFePO 4 Concentrated LiCoO 2 , LiNiO 2 , LiMnO 4 The respective advantages of other materials: no precious metals, cheap raw materials, extremely rich resources; moderate working voltage (3.4V); good platform characteristics, stable voltage, large theoretical capacity (170mAh / g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCH01M4/5825H01M4/62Y02E60/10
Inventor 李阳曹文玉覃广文张文伟连水平
Owner BYD CO LTD
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