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Iron phosphate dihydrate and preparation method thereof, iron phosphate, lithium iron phosphate and lithium ion battery

A technology of ferric phosphate dihydrate and ferric phosphate, which is applied in secondary batteries, chemical instruments and methods, circuits, etc., can solve the problems of high cost and low purity of ferric phosphate, and achieve low cost, good lithium battery performance and high purity Effect

Active Publication Date: 2022-04-26
云南航开科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a kind of ferric phosphate dihydrate and preparation method thereof, to solve the problem of high cost of existing ferric phosphate dihydrate preparation method and low purity of ferric phosphate question

Method used

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  • Iron phosphate dihydrate and preparation method thereof, iron phosphate, lithium iron phosphate and lithium ion battery
  • Iron phosphate dihydrate and preparation method thereof, iron phosphate, lithium iron phosphate and lithium ion battery
  • Iron phosphate dihydrate and preparation method thereof, iron phosphate, lithium iron phosphate and lithium ion battery

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preparation example Construction

[0039] This application provides a preparation method of ferric phosphate dihydrate, please refer to figure 1 ,include:

[0040] S10: Using pyrite slag as a raw material to perform acid leaching to remove impurities to obtain an acid leaching solution.

[0041] Specifically, pyrite slag is the residue of sulfuric acid produced by pyrite, and is one of the main industrial solid wastes in my country. It is mainly used to make cement, bricks, etc. Pyrite slag contains a large amount of iron source, so it can be used as Free iron source, using pyrite slag as raw material can reduce the cost. The iron source in the pyrite slag can be dissolved by acid leaching, and the undissolved impurities can be removed by filtration. The reaction formula is as follows:

[0042] Fe 2 o 3 +6H + =2Fe 3+ +3H 2 O.

[0043] Preferably, the acid leaching and impurity removal by using the pyrite slag as raw material to obtain the acid leaching solution includes:

[0044] Take pyrite slag, add s...

Embodiment 1

[0079] Embodiment 1 prepares the concrete steps of ferric phosphate dihydrate as follows:

[0080] a. Acid leaching to remove impurities: Take pyrite slag, add sulfuric acid for acid leaching, the acid concentration is 3mol / L, the amount added is 2 times the molar mass of iron, the acid leaching temperature is 60 degrees, and the acid leaching is completed and filtered to remove Acid insoluble matter, to obtain pickling solution.

[0081] b. Precipitation and impurity removal: add lye to the pickling solution to adjust the pH to 3.3, so that the ferric hydroxide is completely precipitated and the impurity ions remain in the filtrate. The acid solution was filtered to obtain ferric hydroxide, and the filter cake was washed with water to pH 9.

[0082] c. Acid dissolution: add the filter cake to the phosphoric acid solution, the concentration of the phosphoric acid solution is 3mol / L, the phosphoric acid addition is 3 times the molar mass of iron, and a complexing agent is adde...

Embodiment 2

[0085] Embodiment 2 prepares the concrete steps of ferric phosphate dihydrate as follows:

[0086] a. Acid leaching to remove impurities: take pyrite slag, add hydrochloric acid for acid leaching, the acid concentration is 1mol / L, the amount added is 4 times the molar mass of iron, the acid leaching temperature is 40 degrees, and the acid leaching is completed and filtered to remove Acid insoluble matter, to obtain pickling solution.

[0087] b. Precipitation and impurity removal: add lye to the pickling solution to adjust the pH to 1.6, so that the ferric hydroxide is completely precipitated and the impurity ions remain in the filtrate. The acid solution was filtered to obtain ferric hydroxide, and the filter cake was washed with water to pH 7.

[0088] c, acid soluble: add filter cake in phosphoric acid solution, the concentration of phosphoric acid solution is 1mol / L, and the phosphoric acid addition amount is 7 times of iron molar mass, simultaneously adds complexing agen...

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Abstract

The invention provides iron phosphate dehydrate and a preparation method thereof, iron phosphate, lithium iron phosphate and a lithium ion battery, and relates to the field of lithium batteries, the preparation method of iron phosphate dehydrate uses pyrite cinder to obtain a free iron source, high-purity iron hydroxide is obtained through acid leaching and pH adjustment, and then through introduction of a complexing agent, high-purity iron phosphate is obtained. The dissolution of ferric hydroxide is realized under a relatively low ferrophosphorus ratio, a clarified ferrophosphorus solution is obtained, and the cost is much lower than that of BOM in the prior art. The iron phosphate dihydrate is synthesized through a two-step method, the first step is to add an iron complexing agent, the second step is to dilute a ferrophosphorus solution, and the iron phosphate dihydrate is precipitated at high temperature. By adding the iron complexing agent, it is guaranteed that ferrophosphorus is not subjected to precipitation reaction under the high concentration, wrapping and entrainment of iron oxide red or ferric hydroxide are avoided through the two-step reaction of dissolving first and then precipitating, the purity of obtained iron phosphate dihydrate is higher, and the electrical performance of synthesized lithium iron phosphate is better.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, in particular to ferric phosphate dihydrate and a preparation method thereof, ferric phosphate, lithium iron phosphate and lithium ion batteries. Background technique [0002] Ferric phosphate dihydrate is a white, pink-white monoclinic crystal, and the anhydrous ferric phosphate after dehydration is the precursor for preparing lithium iron phosphate battery materials. Among them, the main synthesis method of ferric phosphate dihydrate is liquid phase precipitation. The process is as follows: change ferrous iron into ferric iron by oxidation or directly add phosphoric acid or phosphate to the solution containing ferric iron ions, and adjust the pH to make the dihydrate Iron phosphate precipitates out. After repeated washing, the soluble salts carried in the ferric phosphate dihydrate are removed, and finally dried and dehydrated to obtain anhydrous ferric phosphate. This met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01B25/45H01M10/0525
CPCC01B25/375C01B25/45H01M10/0525C01P2002/72C01P2004/03C01P2006/40C01P2006/80Y02E60/10
Inventor 李二阳
Owner 云南航开科技有限公司
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