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Method for determining content of residual lithium carbonate and lithium hydroxide on surface of positive electrode material

A positive electrode material, lithium hydroxide technology, applied in the direction of analyzing the material by chemical reaction, material analysis by observing the influence on the chemical indicator, and chemical analysis by titration method, which can solve the problem of large errors and poor test results. Problems such as long cycle time and complex components can achieve the effect of reducing errors and improving test accuracy

Inactive Publication Date: 2019-04-05
CAIHONG GRP ELECTRONICS CO LTD +1
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Problems solved by technology

[0002] At present, as a new type of energy-saving material, the positive electrode material has complex components, and the amount of residual carbonate and hydroxide on the surface of the positive electrode material directly affects the application characteristics of the battery. The disadvantages of the determination method of hydroxide content are: inaccurate measurement, large error, long cycle of test results, Chen Bengao

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  • Method for determining content of residual lithium carbonate and lithium hydroxide on surface of positive electrode material
  • Method for determining content of residual lithium carbonate and lithium hydroxide on surface of positive electrode material
  • Method for determining content of residual lithium carbonate and lithium hydroxide on surface of positive electrode material

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with embodiment.

[0023] A method for measuring residual lithium carbonate and lithium hydroxide content on the surface of positive electrode material, the steps are as follows:

[0024] Step 1: Accurately weigh 30g of sample with a 0.1g precision electronic scale into a 250ml Erlenmeyer flask (accurate to 0.1g), then weigh in 100g of deionized water (accurate to 0.1g), add a magnetic stirrer, and add a rubber stopper 1. Ventilate nitrogen for 2 minutes to discharge the air in the bottle, stir on a magnetic stirrer at low speed for 15 minutes, filter with suction, and use the filtrate for later use.

[0025] Step 2: Use a pipette to accurately pipette 10ml of filtrate and place it in a 250ml conical flask, add 1 drop of 0.1% phenolphthalein indicator, the color of the solution is pink at this time, titrate with 0.01mol / L hydrochloric acid standard solution until the pink color is completely Become co...

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Abstract

The invention discloses a method for determining the content of residual lithium carbonate and lithium hydroxide on the surface of a positive electrode material. The method comprises the following steps: accurately weighing a positive electrode material sample in a conical bottle by an electronic scale, and then weighing deionized water to be added, wherein the mass ratio of the positive electrodematerial sample to the deionized water is 3 to 10; adding a magnetic stir bar, introducing nitrogen to discharge the air in the conical bottle, performing low-speed stirring on a magnetic stirrer with the magnetic stir bar, and then performing suction filtration; accurately removing 10ml of the filtrate obtained in the step I by a pipette, placing the filtrate in the conical bottle, adding a dropof 0.1 percent phenolphthalein indicator in order that the color of the solution becomes pink, titrating the solution with a 0.01mol / L hydrochloric acid standard solution until the pink solution is completely turned into a colorless solution, recording the dosage of hydrochloric acid (V<1>), and adding two drops of 0.1 percent methyl red indicator into the colorless solution obtained in the stepII in order that the solution is yellow; continuing to titrate with the standard hydrochloric acid solution until the solution turns red, and recording the dosage of the hydrochloric acid (V<2>); andcalculating the result. The method has the advantages of accurate testing and low cost.

Description

technical field [0001] The invention relates to a test method for positive electrode materials, in particular to a method for measuring the content of lithium carbonate and lithium hydroxide remaining on the surface of positive electrode materials. Background technique [0002] At present, as a new type of energy-saving material, the positive electrode material has complex components, and the amount of residual carbonate and hydroxide on the surface of the positive electrode material directly affects the application characteristics of the battery. The disadvantages of the determination method of hydroxide content are: inaccurate measurement, large error, long cycle of test results, and Chen Bengao. Contents of the invention [0003] In order to ensure the quality of the positive electrode material, the object of the present invention is to provide a method for measuring the residual lithium carbonate and lithium hydroxide content on the surface of the positive electrode ma...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N31/16
CPCG01N31/16G01N21/78
Inventor 李宝军王晓云
Owner CAIHONG GRP ELECTRONICS CO LTD
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