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Preparation method of nano-structure iron phosphate

A nanostructure, iron phosphate technology, applied in the field of chemical materials, can solve the problems of large influence of raw material addition, increased process complexity, complicated process, etc., and achieves the effect of shortening time, simple process and reducing usage amount.

Active Publication Date: 2021-02-23
JINCHI ENERGY MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis of iron phosphate using this method requires the introduction of surfactants, citric acid, and nitric acid, and the process is complex and uneconomical
[0005] Moreover, in the prior art, the recycling of ferric phosphate slurry mother liquor is mainly to recycle the phosphorus element in it to make it directly participate in the reaction, but this will have a great impact on the amount of subsequent reaction raw materials added, which increases the complexity of the process

Method used

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  • Preparation method of nano-structure iron phosphate
  • Preparation method of nano-structure iron phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Step S1, preparation of ferrous sulfate solution:

[0037] Take a certain amount of titanium dioxide by-product ferrous sulfate heptahydrate, add pure water to dissolve, filter, take the filtrate, add ferric phosphate slurry mother liquor to it to adjust its pH value<2.0, then add concentrated sulfuric acid to adjust its pH value<1.0, and finally Add pure water to prepare 100L solution A with a molar concentration of 1.2 mol / L, and set aside;

[0038] Step S2, preparation of the mixed solution of phosphoric acid and hydrogen peroxide:

[0039] Take a certain amount of industrial-grade phosphoric acid, first add 100L of pure water to prepare a phosphoric acid solution with a molar concentration of 1.2 mol / L, and then add hydrogen peroxide at a molar ratio of phosphoric acid to hydrogen peroxide of 1:0.6 to obtain a mixed solution B for later use;

[0040] Step S3, synthesis reaction process:

[0041]Add solution A in step S1 into the reactor, heat up to 50°C, stir at a...

Embodiment 2

[0048] Step S1, preparation of ferrous sulfate solution:

[0049] Take a certain amount of titanium dioxide by-product ferrous sulfate heptahydrate, add pure water to dissolve, filter, take the filtrate, add ferric phosphate slurry mother liquor to it to adjust its pH value<2.0, then add concentrated sulfuric acid to adjust its pH value<1.0, and finally Add pure water to prepare 100L of a solution with a molar concentration of 1.5 mol / L, and set aside;

[0050] Step S2, preparation of phosphate solution:

[0051] Take a certain amount of industrial-grade phosphoric acid, first add 100L of pure water to prepare a phosphoric acid solution with a molar concentration of 1.5 mol / L, and then add hydrogen peroxide at a molar ratio of phosphoric acid to hydrogen peroxide of 1:0.8 to obtain a mixed solution B for later use;

[0052] Step S3, synthesis reaction process:

[0053] Add solution A in step S1 into the reactor, heat up to 60°C, stir at a frequency of 500rpm, then pump solut...

Embodiment 3

[0060] Step S1, preparation of ferrous sulfate solution:

[0061] Take a certain amount of titanium dioxide by-product ferrous sulfate heptahydrate, add pure water to dissolve, filter, take the filtrate, add ferric phosphate slurry mother liquor to it to adjust its pH value to <2.0, then add concentrated sulfuric acid to adjust its pH value <1.0, Finally, add pure water to prepare 100 L of a solution with a molar concentration of 1.8 mol / L, and set aside;

[0062] Step S2, preparation of the mixed solution of phosphoric acid and hydrogen peroxide:

[0063] Take a certain amount of industrial-grade phosphoric acid, first add 100L of pure water to prepare a phosphoric acid solution with a molar concentration of 1.8mol / L, and then add hydrogen peroxide at a molar ratio of phosphoric acid to hydrogen peroxide of 1:1 to obtain a mixed solution B for later use;

[0064] Step S3, synthesis reaction process:

[0065] Add solution A in step S1 into the reactor, heat up to 100°C, stir...

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Abstract

The invention belongs to the technical field of chemical materials, and provides a preparation method of nano-structure iron phosphate, which comprises the following steps: S1: dissolving titanium dioxide byproduct ferrous sulfate in deionized water, filtering, and adding an iron phosphate slurry mother solution and concentrated sulfuric acid to obtain a solution A for later use; s2, mixing hydrogen peroxide with phosphate or concentrated phosphoric acid to obtain a solution B for later use; s2, adding the solution A in the step S1 into a reaction kettle, heating, stirring, and slowly pumpingthe solution B in the step S2 into the reaction kettle by using a peristaltic pump; finally, slowly introducing ammonia water into the reaction kettle to adjust the pH value, thereby obtaining white iron phosphate slurry; and carrying out solid-liquid separation on the iron phosphate slurry, recycling clear liquid, and carrying out dehydration treatment on solid to obtain anhydrous nano-structureiron phosphate. The iron phosphate synthesized by the method is iron phosphate with a nano structure, the primary particle size is 80-200nm, the tap density is high, the specific surface area is large, and the iron phosphate is a lithium iron phosphate precursor material with excellent performance.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a preparation method of nanostructure iron phosphate. Background technique [0002] Lithium iron phosphate cathode material has the advantages of wide range of raw materials, high safety factor, long service life and low cost, and has attracted more and more attention and application in the lithium battery industry. At present, mainstream lithium battery manufacturers have optimized lithium iron phosphate batteries at the battery pack level to further their application in electric vehicles and other fields. However, for the lithium iron phosphate cathode material itself, the theoretical capacity is limited, and due to its special two-dimensional ion channel, it is difficult to transfer the charge quickly, which limits its electrochemical performance. Existing researches mainly use methods such as ion doping and surface coating to improve the performance of lithium iro...

Claims

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Application Information

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IPC IPC(8): C01B25/37B82Y40/00
CPCB82Y40/00C01B25/375C01P2004/03C01P2004/62C01P2004/64C01P2006/11C01P2006/12
Inventor 刘宙熊意球胡志兵张海艳刘庭杰黎力张娉婷吴泽盈
Owner JINCHI ENERGY MATERIALS CO LTD
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