Method for determining content of ferric iron in lithium iron phosphate

A ferric iron content technology, applied in fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of cumbersome operation and easily affected measurement results, and achieve the effect of high selectivity, high accuracy, and easy operation
CN103226099AInactive Publication Date: 2013-07-31CHANGZHOU UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGZHOU UNIV
Publication Date
2013-07-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for determining the content of ferric iron in a cell anode material LiFePO4. The method utilizes 2-pyridylaldehyde-p-phenyldihydrazone as a fluorescence reagent to detect the content of ferric iron in the LiFePO4 material. The result of the determination of the content of the ferric iron in LiFePO4 in the prior art is easily influenced because of the existence of ferrous iron. The method provided by the invention adopts the combination of ferric iron with a Schiff base compound 2-pyridylaldehyde-p-phenyldihydrazone to quench the fluorescence of 2-pyridylaldehyde-p-phenyldihydrazone, the attenuation intensity of the fluorescence of 2-pyridylaldehyde-p-phenyldihydrazone is in direct proportion to the concentration of ferric iron ions, and other irons comprising ferrous ion and the like do not cause the fluorescence quenching of 2-pyridylaldehyde-p-phenyldihydrazone, so the method based on the fluorescence intensity attenuation of 2-pyridylaldehyde-p-phenyldihydrazone can quantitatively detect the content of ferric iron in LiFePO4.
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Description

technical field

[0001] The present invention relates to the determination of a kind of trivalent iron content, particularly relate to LiFePO 4 Determination of ferric iron content in. Background technique

[0002] Olivine LiFePO 4 It is a new type of lithium-ion battery cathode material developed in recent years. It has the advantages of low price, environmental friendliness, and good thermal stability, so it has received close attention from people.

[0003] LiFePO 4 There are many preparation methods, such as solid-phase synthesis, liquid-phase synthesis, sol-gel method, emulsion drying method and redox method. Regardless of the method, ferrous iron or ferric iron is used as the iron source to prepare LiFePO 4 , but in LiFePO 4 In the system, due to the existence of a trace amount of ferric iron, LiFePO 4 The self-discharge of the positive electrode material increases, and the specific capacity decreases. At the same time, the dissolution of iron and the precipitatio...

Claims

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