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Lithium iron phosphate, preparation method thereof and lithium ion battery

A lithium iron phosphate and lithium source technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of many heterogeneous phases and low compaction density of lithium iron phosphate, and achieve the effect of improving the compaction density

Active Publication Date: 2022-04-15
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a kind of lithium iron phosphate, its preparation method and lithium ion battery, to solve the problems of low compaction density and more impurity phases in lithium iron phosphate prepared by existing methods

Method used

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  • Lithium iron phosphate, preparation method thereof and lithium ion battery
  • Lithium iron phosphate, preparation method thereof and lithium ion battery
  • Lithium iron phosphate, preparation method thereof and lithium ion battery

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preparation example Construction

[0022] As described in the background art, the lithium iron phosphate produced by the existing method has the problems of low compaction density and many impurity phases. In order to solve the above technical problems, the present application provides a method for preparing lithium iron phosphate, the method for preparing lithium iron phosphate includes: mixing a soluble lithium source compound, a soluble ferrous iron source compound and water to obtain a first raw material solution; After the first raw material liquid is raised to a predetermined temperature, in the first inert atmosphere and acidic conditions, the aqueous solution of the soluble phosphorus source compound is mixed with the first raw material liquid by spraying, and the first hydrothermal synthesis reaction is carried out to obtain A first hydrothermal synthesis product system containing lithium iron phosphate; under a second inert atmosphere, the first hydrothermal synthesis product system is subjected to a s...

Embodiment 1

[0039] A preparation method of lithium iron phosphate with high compacted density, comprising:

[0040] Step 1, raw material liquid preparation:

[0041] In a 100L reactor, add 5mol lithium nitrate, 5mol ferrous nitrate, 0.01mol polyvinylpyrrolidone, dissolve in 80L deionized water, stir until completely dissolved, add sodium hydroxide to adjust the pH value to 6.5, and obtain a clear solution (No. - raw material solution); feed high-purity N 2 , after removing the air in the kettle, seal it, continue to stir and heat to 100°C, the heating rate is 5°C / min; dissolve 5mol ammonium dihydrogen phosphate in 20L deionized water, add sodium hydroxide to adjust the pH value to 6.5, and obtain phosphorus source solution.

[0042] Step 2, the first hydrothermal synthesis reaction:

[0043] With the above reaction kettle kept stirring rapidly, inject the phosphorus source solution into the reaction kettle at a speed of 1.0L / min, and keep it warm at 100°C for 3h, and cool to below 50°C...

Embodiment 2

[0047] A preparation method of lithium iron phosphate with high compacted density, comprising:

[0048] Step 1, raw material liquid preparation:

[0049] In a 100L reactor, add 6mol lithium nitrate, 6mol ferrous nitrate, 0.01mol polyvinylpyrrolidone, dissolve in 80L deionized water, stir until completely dissolved, add sodium hydroxide to adjust the pH value to 6.5, and obtain a clear solution (No. - raw material solution); feed high-purity N 2 , after removing the air in the kettle, seal it, continue to stir and heat to 100°C, the heating rate is 5°C / min; dissolve 6mol ammonium dihydrogen phosphate in 20L deionized water, add sodium hydroxide to adjust the pH value to 6.5, and obtain phosphorus source solution;

[0050] Step 2, the first hydrothermal synthesis reaction:

[0051] With the reactor kept stirring rapidly, inject the phosphorus source solution into the reactor at a rate of 1.0 L / min, and keep it at 100°C for 3 hours, and cool to below 50°C after the reaction is...

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Abstract

The invention provides lithium iron phosphate, a preparation method thereof and a lithium ion battery. The method comprises the following steps: mixing a soluble lithium source compound, a soluble ferrous source compound and water to obtain a first raw material solution; heating the first raw material solution to a predetermined temperature, mixing an aqueous solution of a soluble phosphorus source compound with the first raw material solution in a spraying manner in a first inert atmosphere and an acidic condition, and carrying out a first hydrothermal synthesis reaction to obtain a first hydrothermal synthesis product system containing lithium iron phosphate; and in a second inert atmosphere, the first hydrothermal synthesis product system and the raw material replenishing liquid are subjected to a second hydrothermal synthesis reaction, lithium iron phosphate is obtained, and the heating rate of the second hydrothermal synthesis reaction is lower than that of the aqueous solution of the soluble phosphorus source compound. By adopting the method, particle size distribution of large and small particle size grading can be formed, the compaction density is improved, and the problem that impure phases exist in large particles is also solved.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a lithium iron phosphate, a preparation method thereof and a lithium ion battery. Background technique [0002] In recent years, new energy vehicles have been widely recognized and promoted as an emerging efficient and clean transportation tool. As the core component of new energy vehicles, lithium-ion power battery technology has become the core of the development of the new energy vehicle industry. While ensuring energy density, there is an increasingly urgent demand for power batteries to reduce costs and improve safety performance. The lithium iron phosphate material has the advantages of wide sources, low cost, low toxicity, easy recycling, good safety performance, long service life and high specific capacity, and is currently one of the most potential positive electrode materials. [0003] At present, the preparation methods of lithium iron phosphate materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/45
CPCY02E60/10
Inventor 陈巍陈子龙褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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