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Method for detecting metal magnetic impurities in positive electrode material

A technology of metal magnetism and positive electrode materials, which is applied in the direction of analysis materials, measurement devices, and preparation of test samples, etc., can solve the problems of low reliability and validity of the test, non-uniform magnetic adsorption, and large differences in adsorption effects. Achieve the effects of easy real-time tracking, fast testing speed, and excellent adsorption effect

Inactive Publication Date: 2020-09-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no reliable test method for magnetic impurities. The conventional test method is to use magnetic adsorption to absorb the metal magnetic particles in the material, and then use elemental analysis to measure it. However, this method has obvious defects. The reliability and validity of the test are lower
There is no uniform method and standard for magnetic adsorption, and the methods of different operators are different, and the adsorption effect is quite different. The elemental analysis method generally adopts the spectral analysis after the magnetic adsorbate is dissolved and diluted, and the error is large, so the overall effect of the method is not good. good

Method used

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  • Method for detecting metal magnetic impurities in positive electrode material
  • Method for detecting metal magnetic impurities in positive electrode material

Examples

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Effect test

Embodiment 1

[0044] A method for detecting metallic magnetic impurities in positive electrode materials, comprising the steps of:

[0045] S1. Weigh 2Kg of the positive electrode material sample and disperse it in 4Kg of ethanol, stir magnetically at a speed of 800rpm for 1.5h, and then sonicate for 0.5h to obtain the sample solution;

[0046] Put the sample solution in the container, insert a polytetrafluoroethylene round rod equipped with a magnetic rod into the sample solution and fix it, and use a stirrer on both sides of the polytetrafluoroethylene round rod to continuously reverse at a speed of 1000rpm Stir for 3 hours and perform dynamic adsorption, wherein the magnetic force of the magnetic rod is 10000 Gauss, the rotation direction of the two stirrers is changed every 10 minutes at the same time, and the distance between each stirrer and the plastic round rod is the same;

[0047] S2. After the stirring is completed, take out the polytetrafluoroethylene round rod equipped with a m...

Embodiment 2

[0057] A method for detecting metallic magnetic impurities in positive electrode materials, comprising the steps of:

[0058] S1. Weigh 0.5Kg of the negative electrode material sample and disperse it in 5Kg of acetone, stir magnetically at a speed of 1500rpm for 3h, and then sonicate for 0.5h to obtain the sample solution;

[0059] Put the sample solution in the container, insert a polytetrafluoroethylene round rod equipped with a magnetic rod into the sample solution and fix it, and use a stirrer on both sides of the polytetrafluoroethylene round rod to continuously reverse at a speed of 2000rpm Stir for 6 hours for dynamic adsorption, wherein the magnetic force of the magnetic bar is 13000 Gauss, the rotation directions of the two stirrers are changed every 30 minutes at the same time, and the distance between each stirrer and the plastic round bar is the same;

[0060] S2. After the stirring is completed, take out the polytetrafluoroethylene round rod equipped with a magnet...

Embodiment 3

[0064] A method for detecting metallic magnetic impurities in positive electrode materials, comprising the steps of:

[0065] S1. Weigh 10Kg of the positive electrode material sample and disperse it in 20Kg of acetone, stir magnetically at a speed of 300rpm for 0.5h, and then sonicate for 0.5h to obtain the sample solution;

[0066] Put the sample solution in the container, insert a polytetrafluoroethylene round rod equipped with a magnetic rod into the sample solution and fix it, and use a stirrer on both sides of the polytetrafluoroethylene round rod to continuously reverse at a speed of 500rpm Stir for 2 hours to carry out dynamic adsorption, wherein the magnetic force of the magnetic rod is 5000 Gauss, the rotation direction of the two stirrers is changed every 2 minutes at the same time, and the distance between each stirrer and the plastic round rod is the same;

[0067] S2. After the stirring is completed, take out the polytetrafluoroethylene round rod equipped with a m...

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Abstract

The invention discloses a method for detecting metal magnetic impurities in a positive electrode material. The method comprises the following steps: S1, putting a sample solution into a container, inserting a plastic round rod filled with a magnetic rod into the sample solution, and carrying out continuous stirring by using a stirrer in each of two sides of the plastic round rod to perform dynamicadsorption; S2, after stirring is finished, taking out the plastic round rod filled with the magnetic rod, firstly washing off physically adsorbed particles, then taking out the magnetic rod, and dispersing residual particles on the surface of the plastic round rod into a solvent A to obtain an adsorption solution; and S3, adding a hydrochloric acid aqueous solution into the adsorption liquid, carrying out stirring and filtering, taking a filter cake, and detecting the total particle number and the metal particle number. The magnetic rod can adsorb magnetic metal particles without dead angles, the physically adsorbed particles on the magnetic rod are reduced, and the purpose of rapidly and accurately detecting the magnetic particles in the positive and negative electrode materials of thebattery is achieved.

Description

technical field [0001] The invention relates to the technical field of detecting metallic magnetic impurities in positive electrode materials, in particular to a method for detecting metallic magnetic impurities in positive electrode materials. Background technique [0002] Metal magnetic impurities are a common impurity in lithium battery materials, which are brought in by raw materials, introduced by metal equipment, or generated in situ during the sintering process during the synthesis of iron-lithium materials. Metal magnetic impurities mainly include elemental Fe, alloys of Fe, Cr and Ni, and eutectics of Fe and P. Metal magnetic impurities have serious harm to the battery core. They will lose electrons and form free ions under the erosion of high working potential and polar solvents such as HF, and migrate to the surface of the negative electrode driven by the electric field, where they are reduced to metal dendritic. These simple metal dendrites will not only cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/10G01N15/02G01N1/40G01N1/28
CPCG01N15/10G01N15/02G01N1/405G01N1/4077G01N1/28G01N2001/4088
Inventor 程蒙陈峰杨茂萍汪伟伟陈霞万宁李鹏飞
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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