Scanning electron microscope testing method for iron phosphate sample

A technology of scanning electron microscopy and testing methods, which is applied in the direction of material analysis by measuring secondary emissions, and can solve the problem that surface structure photos cannot correctly reflect the surface structure of iron phosphate

Inactive Publication Date: 2019-04-09
HUBEI RT ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the surface structure photo obtained by the scanning electron microscope test method of the existing iron phosphate sample cannot correctly reflec

Method used

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  • Scanning electron microscope testing method for iron phosphate sample
  • Scanning electron microscope testing method for iron phosphate sample
  • Scanning electron microscope testing method for iron phosphate sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) sample preparation

[0034] Use conductive carbon glue, take a small amount of iron phosphate powder sample with a toothpick, sprinkle it lightly on the conductive glue, and then purge it to remove unadhered powder.

[0035] (2) SEM test

[0036] A field emission scanning electron microscope (purchased from Hitachi) was selected, and the resolution index: 15kv, 0.8nm; 1kv, 1.1nm.

[0037] The above-mentioned field emission scanning electron microscope was used to test the sample prepared in step (1). The parameters used in the test process were: working distance 2.1mm, acceleration voltage 0.7kv. The 100,000-fold iron phosphate SEM photos taken are as follows figure 2 shown.

Embodiment 2

[0039] (1) sample preparation

[0040] Use conductive carbon glue, take a small amount of iron phosphate powder sample with a toothpick, sprinkle it lightly on the conductive glue, and then purge it to remove unadhered powder.

[0041] (2) SEM test

[0042] Select a field emission scanning electron microscope (purchased from Zeiss), resolution index: 15kv, 1.0nm; 1kv, 1.6nm.

[0043] The above-mentioned field emission scanning electron microscope was used to test the sample prepared in step (1). The parameters used in the test process were: working distance 1.8mm, acceleration voltage 1.0kv. The 100,000-fold iron phosphate SEM photos taken are as follows image 3 shown.

Embodiment 3

[0045] (1) sample preparation

[0046] Use conductive carbon glue, take a small amount of iron phosphate powder sample with a toothpick, sprinkle it lightly on the conductive glue, and then purge it to remove unadhered powder.

[0047] (2) SEM test

[0048] Choose a field emission scanning electron microscope (purchased from FEI Company), resolution index: 15kv, 1.0nm; 1kv, 1.3nm.

[0049] The above-mentioned field emission scanning electron microscope was used to test the sample prepared in step (1). The parameters used in the test process were: working distance 4.0mm, acceleration voltage 0.8kv.

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Abstract

The invention relates to the field of positive electrode lithium iron phosphate lithium ion battery and discloses a scanning electron microscope testing method for an iron phosphate sample. The methodcomprises the following steps: 1) sample preparation: sprinkling iron phosphate powder on carbon conductive adhesive, and then performing blowing; and 2) scanning electron microscope testing: testingthe prepared sample by using a field emission scanning electron microscope. After the testing method is used, no charging phenomenon occurs, no fine particle structure occurs like coating which covers the true surface structure of the material, and finally the correct and clear surface structure of iron phosphate is presented.

Description

technical field [0001] The invention relates to the field of preparing positive lithium iron phosphate lithium ion batteries, in particular to a scanning electron microscope test method for iron phosphate samples. Background technique [0002] The conductivity of iron phosphate is very poor, if it is used for SEM, there will be a strong charging phenomenon. Therefore, when the surface morphology of iron phosphate is generally photographed, a coating is applied to increase the conductivity of the sample. There are three kinds of conductive films in the current sample preparation methods, namely carbon film, platinum film and gold film. There are two main types of coating equipment: ion sputtering equipment and vacuum coating equipment. As far as iron phosphate materials are concerned, gold spraying and gold coating are conventionally selected. [0003] However, after coating, although the conductivity of the material will be improved to a certain extent and most of the char...

Claims

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Application Information

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IPC IPC(8): G01N23/22
CPCG01N23/22
Inventor 何雅孙杰许中柱
Owner HUBEI RT ADVANCED MATERIALS CO LTD
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