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Method for preparing ferric pyrophosphate for lithium battery and ferric pyrophosphate prepared by method

A technology of iron orthophosphate and lithium batteries, which is applied in the direction of phosphate, battery electrodes, phosphorus oxyacids, etc., can solve the problems of high cost, achieve the effects of ensuring utilization rate, reducing production cost, and high purity

Active Publication Date: 2013-05-08
GUIZHOU ANDA TECH ENERGY 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 problem of high cost of the preparation method of iron orthophosphate for lithium ion batteries in the prior art, the invention provides a preparation method of iron orthophosphate for lithium ion batteries

Method used

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  • Method for preparing ferric pyrophosphate for lithium battery and ferric pyrophosphate prepared by method
  • Method for preparing ferric pyrophosphate for lithium battery and ferric pyrophosphate prepared by method
  • Method for preparing ferric pyrophosphate for lithium battery and ferric pyrophosphate prepared by method

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preparation example Construction

[0022] The preparation method of ferric orthophosphate disclosed by the invention comprises:

[0023] S1, pulverizing ferrophosphorus raw materials to obtain ferrophosphorus fines;

[0024] S2. Mix the ferrophosphorus fine material with the acid solution, then pass through the oxidizing gas, and filter to obtain solution A; wherein, the acid solution is selected from one or more of sulfuric acid, hydrochloric acid or nitric acid;

[0025] S3, adding a phosphorus source to solution A to obtain solution B; the phosphorus source is selected from phosphoric acid and / or phosphate;

[0026] S4, in the stirring state, add solution B and lye into the container in parallel, and control the pH value of the solution in the container to remain at 2.0-2.5, continue stirring to obtain a slurry with ferric orthophosphate;

[0027] S5. Separating the solid phase and mother liquor in the slurry, washing and drying the solid phase to obtain ferric orthophosphate.

[0028] The invention adopts...

Embodiment 1

[0055] This example is used to illustrate the preparation method of the ferric orthophosphate disclosed by the present invention.

[0056] Weigh 1000 g of ferrophosphorus slag from the yellow phosphorus electric furnace, and crush it to 60 mesh with a jaw crusher to obtain ferrophosphorus fines.

[0057] Determine that wherein the massfraction of iron is 72.5%, the massfraction of phosphorus is 23.4%, the massfraction of silicon is 1.8%, the massfraction of manganese is 1.1%, the massfraction of nickel is 0.8%, and the massfraction of titanium is determined by ICP test. 0.1%, the mass fraction of carbon is 0.1%, the mass fraction of calcium is 0.09%, and the mass fraction of sulfur is 0.05%.

[0058] Add 5000g of deionized water into a 10L reactor lined with a PE jacketed electric heater, weigh 500g of the above-mentioned ferrophosphorus fine material, add it to the reactor and stir, add 800g of industrial concentrated solution with a mass fraction of 98% to the reactor. Sulf...

Embodiment 2

[0063] This example is used to illustrate the preparation method of the ferric orthophosphate disclosed by the present invention.

[0064] Weigh 1000 g of ferrophosphorus slag from the yellow phosphorus electric furnace, and crush it to 60 mesh with a jaw crusher to obtain ferrophosphorus fines.

[0065] Determine that wherein the massfraction of iron is 74.3%, the massfraction of phosphorus is 22.1%, the massfraction of silicon is 1.5%, the massfraction of manganese is 1.3%, the massfraction of nickel is 0.4%, and the massfraction of titanium is determined by ICP test. 0.2%, the mass fraction of carbon is 0.06%, the mass fraction of calcium is 0.03%, and the mass fraction of sulfur is 0.03%.

[0066] Add 5000g of deionized water to a 10L reactor lined with a PE jacketed electric heater, weigh 500g of the above ferrophosphorus fines, add to the reactor and stir, add 1600g of industrial hydrochloric acid with a mass fraction of 36.5% to the reactor , turn on the electric heate...

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Abstract

The invention provides a method for preparing ferric pyrophosphate for a lithium battery. The method comprises the following steps: 1. crushing ferrophosphorus raw materials to obtain ferrophosphorus fine powder; 2. mixing the ferrophosphorus fine powder and an acid solution, introducing oxidative gas and filtering to obtain a solution A, wherein the acid solution is selected from one or more of sulfuric acid, hydrochloric acid or nitric acid; 3. adding a phosphorus source into the solution A to obtain a solution B, wherein the phosphorus source is selected from phosphoric acid and / or phosphate; 4. adding the solution B and an alkali liquor into a container in parallel in a stirring state, controlling the pH value of the solution in the container, keeping the pH value to be 2.0-2.5, continuously stirring to obtain slurry with ferric pyrophosphate; and 5. separating a solid phase from a mother solution in the slurry, washing and drying the solid phase to obtain the ferric pyrophosphate. Meanwhile, the invention also discloses ferric pyrophosphate prepared by the method. The method for preparing the ferric pyrophosphate for the lithium battery is simple in process and low in cost.

Description

technical field [0001] The invention relates to a method for preparing ferric orthophosphate and ferric orthophosphate prepared by the method, in particular to a method for preparing ferric orthophosphate used for preparing lithium ion batteries and ferric orthophosphate prepared by the method. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has many advantages such as high voltage, high energy density, long life, small self-discharge, no memory effect, and wide operating temperature range. It is used in small mobile energy fields, such as mobile phones, digital cameras, etc. , and large-scale mobile energy fields, such as plug-in hybrid vehicles, pure electric vehicles, etc., and stationary energy fields, such as energy storage power stations, UPS, etc., have a wide range of applications and application prospects. [0003] Cathode materials are an important part of lithium-ion batteries, and their performance largely de...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/26
CPCY02E60/12Y02E60/10
Inventor 刘建波
Owner GUIZHOU ANDA TECH ENERGY CO LTD
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