Method for measuring iron content of lithium iron phosphorous oxide iron source raw material of lithium ion power battery anode material

A technology for power batteries and positive electrode materials, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators. It can solve human health hazards, mercury salt environmental pollution, and test accuracy. Poor and other problems, to achieve the effect of reducing pollution, accurate test results, and easy control

Inactive Publication Date: 2012-07-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

[0004] At present, there are many chemical analysis methods for testing the iron content of iron sources, the most commonly used of which is the classic SnCl 2 -HgCl 2 Preredox Potassium Dichromate (K 2 Cr 2 o 7 ) method to determine iron content, although the accuracy of this method is relative...

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  • Method for measuring iron content of lithium iron phosphorous oxide iron source raw material of lithium ion power battery anode material
  • Method for measuring iron content of lithium iron phosphorous oxide iron source raw material of lithium ion power battery anode material

Examples

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Embodiment 1

[0035] Example 1 : Weigh about 2.0125g of FeC with two crucibles 2 o 4 2H 2 O was placed in a muffle furnace, set the calcination temperature to 200°C, started heating, opened the furnace door after 2 hours, and weighed 1.0g KClO in a crucible 3 Put it into a muffle furnace, close the furnace door, adjust the calcination temperature to 600°C, and close the muffle furnace after calcination for 4 hours. When the furnace temperature drops below 200°C, the calcined product Fe 2 o 3 Place in a desiccator, cool to room temperature, and weigh the total weight to be 0.8937g. Weigh 0.1693g Fe2O3 sample into the conical flask, add 5mL concentrated hydrochloric acid, heat the conical flask slightly to ensure that the solution does not boil, after the Fe2O3 sample is completely dissolved, add 40mL deionized water to the conical flask, continue heating until boiling, Add 5 drops of methyl orange indicator, first use 10% SnCl2 reagent to titrate the color of the solution to light ye...

Embodiment 2

[0049] Example 2: Two experimenters weighed about 1.0123g of Fe in crucibles 2 o 3 Put the standard sample (99.99%) into the muffle furnace, set the calcination temperature to 200°C, start heating, open the furnace door after 2 hours, and weigh 0.5g KClO with a crucible 3 Put it into a muffle furnace, close the furnace door, adjust the calcination temperature to 600°C, and close the muffle furnace after calcination for 4 hours. When the furnace temperature drops below 200°C, the calcined product Fe 2 o 3 Place in a desiccator, cool to room temperature, and weigh the total weight to be 1.0110g. Weigh about 0.1694g Fe 2 o 3 Put the sample in the Erlenmeyer flask, add 5mL of concentrated hydrochloric acid, heat the Erlenmeyer flask slightly to ensure that the solution does not boil, and wait until Fe 2 o 3 After the sample is completely dissolved, add 40mL to the Erlenmeyer flask, continue heating until boiling, add 5 drops of methyl orange indicator, first use 10% SnCl ...

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Abstract

The invention relates to a method for measuring the iron content of a lithium iron phosphorous oxide iron source raw material of a lithium ion power battery anode material. The method comprises the following steps: placing an iron salt raw material into a muffle furnace for high-temperature calcinations; heating and dissolving a calcined product by using concentrated hydrochloric acid; adding a proper amount of deionized water to adjust the acidity of a solution; continuously heating the solution till boiling; adding a few drops of methyl hesperidin indicators; adding a high-concentration stannous chloride solution until the solution becomes straw yellow; slowly and dropwise adding a low-concentration stannous chloride solution until the solution becomes pink; and shaking uniformly to obtain a colorless transparent solution; quickly cooling; adding a proper amount of sulfur-phosphorus mixture acid; dropwise adding a few drops of sodium diphenylaminesulfonate indicators; and titrating a potassium dichromate standard solution, and completing a reaction process when the solution is changed from blue-green into purple. The method is convenient to operate and easy to control in the whole process and accurate in the test result. Compared with the conventional method, the method has the advantages that mercury salt is not adopted, so the health of operation staff is not damaged, the environment pollution is avoided, and the method is suitable for testing of the lithium iron phosphorous oxide iron source raw material of the lithium ion power battery anode material.

Description

technical field [0001] The invention relates to the field of lithium-ion battery cathode materials, in particular to a method for determining iron content in lithium-iron-phosphorus-iron source raw materials for lithium-ion power battery cathode materials. Background technique [0002] Lithium-ion batteries are widely used in notebook computers, digital cameras, electronic instruments, mobile phones and other fields because of their advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide working range; in recent years , Lithium-ion batteries are widely used in the fields of large-capacity energy storage equipment such as electric bicycles, electric vehicles, and aerospace. Among them, lithium iron phosphorus oxide material is the preferred cathode material for these large-capacity batteries because of its many advantages that other cathode materials do not have. [0003] Since 1997 J. B. The Goodenough...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 王超查秀芳李晓俊王鑫汪菊青
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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