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Method of measuring content of trace-amount soluble impurities in lithium cobalt oxide

A technology of impurity content and determination method, which is applied in chemical method analysis, chemical analysis by titration method, measuring device, etc., can solve the problem of inaccurate soluble impurities and achieve high accuracy and high feasibility

Pending Publication Date: 2018-07-27
SHENZHEN BAK POWER BATTERY CO LTD +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for determining the content of trace soluble impurities in lithium cobaltate in view of the inaccurate detection of soluble impurities in lithium cobaltate by existing standard methods

Method used

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  • Method of measuring content of trace-amount soluble impurities in lithium cobalt oxide
  • Method of measuring content of trace-amount soluble impurities in lithium cobalt oxide
  • Method of measuring content of trace-amount soluble impurities in lithium cobalt oxide

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Embodiment

[0042] A method for assaying the content of trace soluble impurities in lithium cobaltate, comprising the steps of:

[0043] Step S01. Weigh 10g of lithium cobaltate sample (accurate to the fourth decimal place) in a 250mL glass beaker, add 100.0mL to remove CO 2 distilled water, seal the beaker with plastic wrap, electromagnetically stir for 10 minutes, and dry filter;

[0044] Step S02. Accurately pipette 50.0 mL of the filtrate obtained in step S01, place it in a 100 mL glass beaker, and use an automatic potentiometric titrator to perform acid-base titration. The titrant concentration of dilute hydrochloric acid is 0.05985 mol / L, and the titrant is recorded during the titration process. The amount used and the corresponding electrode potential change value were carried out three parallel titrations;

[0045] Step S03. Finally, according to the consumption of hydrochloric acid V corresponding to the two titration jumps in the titration 1 and V 2 , and calculate LiOH and L...

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Abstract

The invention relates to the technical field of measurement of trace-amount impurities, and particularly discloses a method of measuring content of trace-amount soluble impurities in lithium cobalt oxide. The method at least includes steps of: S1) dissolving a lithium cobalt oxide sample (g) in distilled water and filtering the solution; S2) performing acid base titration to the filtrate in the step S1) by means of an automatic potentiometric titrator, and recording the usage amount of a titration agent and electrode potential change value; S3) according the consumption volume V1 and V2, whichare respectively corresponding to two jumps of the electrode potential change value, of the titration agent, calculating mass percentage of LiOH and Li2CO3 in the lithium cobalt oxide. The method issimple and quick, is free of pollution and is high in precision. The invention provides a scheme for detection of soluble salts in the lithium cobalt oxide at high availability and provides referencefor accurate measurement of contents of trace-amount impurities.

Description

technical field [0001] The invention relates to the technical field of measuring trace impurities, in particular to a method for measuring the content of trace soluble impurities in lithium cobaltate. Background technique [0002] Lithium cobaltate is an important positive electrode material for lithium-ion batteries, but under normal circumstances, due to the influence of the processing and synthesis process, impurities are often easily brought in due to changes in production conditions during the processing of lithium cobaltate raw materials. [0003] Common impurities in lithium cobalt oxide include metal elements such as Cu, Ni, Fe and LiOH, Li 2 CO 3 and other soluble salts. Among these impurities, metal elements can be determined by dissolving them in water and using inductively coupled plasma emission spectrometry. But because soluble salt content is very little on the one hand, in lithium cobalt oxide solution, the total concentration of soluble salt is only about...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/164
Inventor 陈进英刘玉梅
Owner SHENZHEN BAK POWER BATTERY CO LTD
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