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Manganese ferrous phosphate as well as preparation method and application thereof

A technology of ferrous manganese phosphate and ferrous phosphate, which is applied in the preparation of ferrous manganese phosphate, application of ferrous manganese phosphate in lithium iron manganese phosphate battery, in the field of ferrous manganese phosphate, can solve the problem that the proportion of ferrous manganese phosphate is different Stability and other issues, to achieve the effect of stable ratio, low impurity content, and uniform distribution of elements

Active Publication Date: 2022-02-18
HUBEI RT ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In view of this, the present application provides a method for preparing manganese ferrous phosphate and the obtained manganous ferrous phosphate, aiming to improve the problem of unstable ratio of ferromanganese phosphate obtained by the existing method for preparing manganese ferrous phosphate

Method used

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  • Manganese ferrous phosphate as well as preparation method and application thereof
  • Manganese ferrous phosphate as well as preparation method and application thereof
  • Manganese ferrous phosphate as well as preparation method and application thereof

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preparation example Construction

[0033] see figure 1 , the embodiment of the present application provides a method for preparing battery-grade manganese ferrous phosphate, comprising the following steps:

[0034] A: dissolving divalent manganese salt and ferrous salt in water to obtain a mixed salt solution of manganese salt and iron salt;

[0035] B: adding a phosphorus source to the mixed salt solution to obtain a precursor solution;

[0036] C: adding alkali to the precursor solution, and co-precipitating to obtain ferrous manganese phosphate slurry, which contains ferrous phosphate precipitation and ferromanganese phosphate precipitation;

[0037] D: Washing, filtering and drying the ferrous manganese phosphate slurry to obtain ferrous manganese phosphate, and the ferrous manganese phosphate is a mixture of ferrous phosphate and ferromanganese phosphate.

[0038] In the step A:

[0039] The divalent manganese salt is a water-soluble divalent manganese salt. The water-soluble divalent manganese salt may ...

Embodiment 1

[0062] 120.000g of ferrous sulfate heptahydrate (0.432mol) and 110.466g of battery grade manganese sulfate (0.648mol) were dissolved in 300g of water to obtain a mixed salt solution;

[0063] 225.583g of trisodium phosphate (0.582mol) was dissolved in 700g of water to obtain trisodium phosphate solution, and 24g of phosphoric acid solution (0.209mol) with a concentration of 85.4% was added dropwise to the mixed salt solution while stirring, and then added dropwise The trisodium phosphate solution;

[0064] Use sodium hydroxide to adjust the pH value of the system to 7, and then continue to stir at room temperature for 2 hours to obtain ferrous manganese phosphate slurry;

[0065] The ferrous manganese phosphate slurry is washed with water, filtered and dried to obtain ferrous manganese phosphate.

[0066] The ferrous manganese phosphate of the present embodiment is (Mn 0.6 Fe 0.4 ) 3 (PO 4 ) 2 ·yH 2 O.

Embodiment 2

[0068] Dissolve 120.000g of ferrous sulfate heptahydrate (0.432mol) and 110.466g of battery grade manganese sulfate (0.647mol) in 300g of water to obtain a mixed salt solution;

[0069] 225.583g of trisodium phosphate (0.582mol) was dissolved in 700g of water to obtain trisodium phosphate solution, and 24g of phosphoric acid solution (0.209mol) with a concentration of 85.4% was added dropwise to the mixed salt solution while stirring, and then added dropwise The trisodium phosphate solution;

[0070] Adjust the pH value of the system to 6.5 with sodium hydroxide, and then continue to stir at room temperature for 2 hours to obtain ferrous manganese phosphate slurry;

[0071] The ferrous manganese phosphate slurry is washed with water, filtered and dried to obtain ferrous manganese phosphate.

[0072] The ferrous manganese phosphate of the present embodiment is (Mn 0.6 Fe 0.4 ) 3 (PO 4 ) 2 ·yH 2 O.

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Abstract

The invention discloses manganese ferrous phosphate and a preparation method and application thereof, wherein the preparation method comprises the following steps: dissolving divalent manganese salt and divalent iron salt in water to obtain a mixed salt solution of manganese salt and iron salt; adding a phosphorus source into the mixed salt solution to obtain a precursor solution; adding alkali into the precursor solution for co-precipitation to prepare ferrous phosphate manganese slurry, which contains ferrous phosphate precipitates and ferromanganese phosphate precipitates; and washing, filtering and drying the manganese ferrous phosphate slurry to obtain manganese ferrous phosphate. According to the preparation method of the manganese ferrous phosphate, nitrogen does not need to be introduced, so that nitrogen oxide waste gas cannot be generated, and environmental pollution cannot be caused. Besides, the proportion of iron, phosphorus and manganese in the manganese ferrous phosphate prepared by the preparation method of the manganese ferrous phosphate is stable, the impurity content is low, and the requirements of a lithium iron manganese phosphate positive electrode material on a precursor raw material can be met.

Description

technical field [0001] The present application relates to the technical field of battery anode material manufacturing, and in particular to a preparation method of manganese ferrous phosphate, manganese ferrous phosphate prepared by the preparation method, and the production of manganese ferrous phosphate in lithium iron manganese phosphate batteries. application. Background technique [0002] The power lithium-ion battery has the advantages of high specific energy, high specific power, high safety and long cycle life, and is an ideal power source for electric vehicles and various electric tools. Among the positive electrode materials of lithium-ion batteries, lithium iron manganese phosphate (LMFP) has the same specific capacity as lithium iron phosphate (theoretical capacity is 170mAh / g), and has a higher voltage platform (about 4.1V), which can be used in phosphoric acid Based on lithium iron, the energy density is increased by about 20%. Therefore, lithium iron mangane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCC01B25/45H01M4/5825C01P2002/72C01P2006/80Y02E60/10
Inventor 刘海娟魏义华孙杰许中柱梅京江南权立李浩何中林
Owner HUBEI RT ADVANCED MATERIALS CO LTD
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