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Method for detecting content of residual free lithium in lithium iron phosphate/carbon composite material

A technology of carbon composite materials and lithium iron phosphate, which is applied in the direction of chemical analysis by titration method, can solve the problems of no public test method, etc., and achieve the effect of small test result error and simple operation

Active Publication Date: 2016-08-10
ZHEJIANG RICHPOWER TECH
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Problems solved by technology

[0004] At present, there is no public test method for the residual free lithium in lithium iron phosphate / carbon composites

Method used

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Embodiment 1

[0031] The invention provides a method for detecting residual free lithium content in a lithium iron phosphate / carbon composite material, said method comprising the following steps:

[0032] (1) Preparation of test solution for lithium iron phosphate / carbon composite material sample

[0033] For a portion of lithium iron phosphate / carbon composite material, weigh 50.01g, 49.88g, 48.98g, 51.17g, and 51.04g respectively and add them to five 500mL beakers, then add 200mL deionized water respectively, and use ultrasonic power of 100W for ultrasonic 10min; then the suspension obtained after ultrasonication was filtered with filter paper, and then the filtrate was sucked in and out with a 0.45 μm microporous sand core funnel to obtain 5 parts of clarified filtrate;

[0034] (2) Determination of free lithium content

[0035] Rinse the 25mL pipette with the filtrate for 3 times, pipette 25mL of the filtrate into a 100mL beaker, add a magnetic stirring bar and place it on the magnetic...

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Abstract

The invention discloses a method for detecting the content of residual free lithium in a lithium iron phosphate / carbon composite material, and belongs to the technical field of lithium content determination method. A pH control stepwise titration method is adopted, the residual free lithium element in the lithium iron phosphate / carbon composite material is accurately determined, and the existing form of lithium carbonate or lithium bicarbonate of the free lithium element is effectively distinguished. The detection method has the advantages of being simple to operate, small in error of detection results, more scientific and reasonable, and accurate, can accurately give out the existing form of the free lithium element, and has important industrial value.

Description

technical field [0001] The invention relates to a method for measuring lithium content, in particular to a method for detecting residual free lithium content in lithium iron phosphate / carbon composite materials. The lithium iron phosphate / carbon composite material is the positive electrode material of the lithium ion battery. Background technique [0002] Lithium iron phosphate / carbon composite material, as a positive electrode active material for lithium-ion batteries, has a large number of applications in the fields of power batteries and energy storage batteries because of its cheap price, environmental friendliness, high safety, and good cycle performance. [0003] The synthesis process of lithium iron phosphate / carbon composite material is generally as follows: lithium salt, iron salt, phosphorus salt and carbon source are used for wet mixing, then dried, and then sintered at high temperature to obtain lithium iron phosphate / carbon composite material. Commonly used lit...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 于文志陈家骅许丁丁项晓鹏郑金龙胡大伟葛照明
Owner ZHEJIANG RICHPOWER TECH
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