Method for detecting content of main element in carbon coated lithium iron phosphate or lithium manganese ferric phosphate

A technology of carbon-coated lithium iron phosphate and lithium manganese iron phosphate, which is applied in the field of lithium-ion batteries, can solve the problems of many operation steps and easy errors, and achieve the effect of less acid consumption, no danger, and reduced workload

Inactive Publication Date: 2016-03-02
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology

[0004] Aiming at the shortcomings of existing detection methods, such as many operation steps and easy to cause errors, the purpose of the present in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] For the detection of lithium, iron and phosphorus in carbon-coated lithium iron phosphate, the analysis steps are as follows:

[0027] 1. Sample pretreatment

[0028] Weigh 0.1000g of the lithium iron phosphate sample to be tested into a 100mL beaker, add 20mL (1+1) hydrochloric acid, cover with a watch glass, and heat to dissolve for about 15min. Cool to room temperature, carefully rinse the cup wall and watch glass, transfer the test solution to a 250mL volumetric flask, shake well and let it stand, after the solution is layered, absorb a part of the clear and transparent solution as the test solution;

[0029] 2. Draw the standard curve:

[0030] A series of mixed standard solutions of lithium, iron, and phosphorus were prepared and tested by ICP-OES. The standard curve was drawn with the element concentration as the abscissa and the emission intensity as the ordinate. The linear equation and correlation coefficient of the standard curve are shown in Table 2.

[00...

Embodiment 2

[0039] For the detection of lithium, iron, manganese and phosphorus in carbon-coated lithium manganese iron phosphate, the analysis steps are as follows:

[0040] 1. Sample pretreatment

[0041] Weigh 0.1001g of the lithium iron phosphate sample to be tested into a 100mL beaker, add 20mL (1+1) nitric acid, cover with a watch glass, and heat to dissolve for about 20min. Cool to room temperature, carefully rinse the cup wall and watch glass, transfer the test solution to a 500mL volumetric flask, shake well and let it stand, after the solution is layered, absorb a part of the clear and transparent solution as the test solution;

[0042] 2. Draw the standard curve:

[0043] A series of mixed standard solutions of lithium, iron, manganese, and phosphorus were prepared and tested by ICP-OES. The standard curve was drawn with the element concentration as the abscissa and the emission intensity as the ordinate. The linear equation and correlation coefficient of the standard curve ar...

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Abstract

The invention discloses a method for detecting the content of a main element in carbon coated lithium iron phosphate or lithium manganese ferric phosphate. The method comprises the steps of 1 sample pretreatment, wherein a sample to be detected is cleared up through acid and transferred, volume metering and still standing are carried out, and after a solution is layered, a middle clear part is sucked as liquid to be detected; 2 standard curve drawing, wherein a series of mixed standard solutions are prepared according to the variety of the main element to be detected, an inductive coupling plasma emission spectrometer is utilized for carrying out testing, and a standard curve is drawn; 3 main element content measuring, wherein the inductive coupling plasma emission spectrometer is used for measuring the content of the main element in the solution to be detected. The pretreatment process is simple, the analysis result is accurate, the content of the main element in carbon coated lithium iron phosphate or lithium manganese ferric phosphate can be measured fast, accurately and quantitatively, and reliable guarantees are provided for improving the product quality of lithium iron phosphate and lithium manganese ferric phosphate and controlling the intermediate technological process.

Description

technical field [0001] The invention relates to a method for detecting main element content in carbon-coated lithium iron phosphate or lithium manganese iron phosphate, belonging to the technical field of lithium ion batteries. Background technique [0002] Due to the advantages of high working voltage, high energy density, long cycle life, and no memory effect, lithium-ion batteries have attracted much attention. Do not open the lithium-ion battery. As a new type of cathode material for lithium-ion batteries, lithium iron phosphate has the advantages of high safety and long life, and has entered the stage of industrial application. The detection of lithium, iron, and phosphorus content is not only a key indicator of the quality of lithium iron phosphate materials, but also plays an important guiding role in the adjustment of the production process. However, there is no unified standard for the relevant detection methods of lithium iron phosphate cathode materials. Most of...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N1/28
Inventor 白晓艳马小利刘美子张超唐海波卢世刚
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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