A sample processing method for determining residual lithium salts on the surface of battery case by flame atomic absorption method
A technology of flame atomic absorption and battery casing, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as unexamined and pre-analytical treatment methods, and achieve the effect of avoiding interference and suppressing ionization of lithium
Active Publication Date: 2019-09-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology
There are many methods for the determination of metal lithium by flame atomic absorption spectrometry, but there is no suitable sample pretreatment method for the analysis of residual lithium salt content in battery cases
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[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0019] A sample processing method for measuring residual lithium salt on the surface of a battery casing by flame atomic absorption method, comprising the following steps:
[0020] (1) Take the unwashed battery filled with electrolyte and place it in a 200ml glass beaker, clean the surface of the battery with dimethyl carbonate, continue to add dimethyl carbonate after cleaning to submerge the whole battery, let it stand for 30 minutes in ventilation, and clean it ultrasonically 10min extraction of lithium salt;
[0021] (2) After ultrasonic cleaning, take out the battery and dry it, then clean the battery shell with nitric acid solution. After cleaning, continue to add nitric acid solution to submerge the whole battery, let it stand for 30 minutes in ventilation, and then ultrasonically clean at 60°C for 10 minutes to extract lithium...
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The invention discloses a sample processing method for determining residual lithium salt on a surface of a battery shell in a flame atomic absorption spectroscopy method. The method comprises the following steps: cleaning and extracting the surface of a battery shell by using dimethyl carbonate, continuously performing ultrasonic immersion for a battery eluted by the dimethyl carbonate by using a nitric acid solution to extract the lithium salt, concentrating a dimethyl carbonate extract solution, adding a nitric acid solution, performing oscillation extract, and transferring a nitric acid phase into the nitric acid extract solution; heating to remove the acid, transferring the residual solution into a volume bottle after the acid removal, adding 1ml of 1 percent cesium chloride, fixing the volume by using deionized water to obtain a solution to be detected; and performing the blank treatment by adopting a same method, and determining the sample to be detected and the blank sample by directly using the flame atomic absorption spectroscopy method. By adopting a combined pretreatment means for dissolving the residual lithium salt on the surface of the battery shell by using the dimethyl carbonate and the nitric acid solution, and the lithium salt in the dimethyl carbonate is extracted into the nitric acid solution by using a liquid-liquid extraction method, so that the interference of organic solvents is effectively avoided.
Description
technical field [0001] The invention relates to a lithium element detection on the surface of a battery casing, in particular to a sample processing method for measuring residual lithium salts on the surface of a battery casing by a flame atomic absorption method. Background technique [0002] During the production process of lithium-ion batteries, it is necessary to fill the cells in the battery case with electrolyte. However, due to the problem of the way of filling, a large amount of electrolyte remains on the battery case during the filling process. Contains organic solvents and lithium salts, and lithium salts have a serious corrosion effect on the battery modules and battery packs we produce, corrode the battery control and management system in the battery pack, cause the battery charge and discharge out of control, and affect the safety and security of the battery. Battery Life. Therefore, it is necessary to quantitatively analyze the lithium salt remaining on the ba...
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IPC IPC(8): G01N21/31
Inventor 李涛梅东海史其乐吴哲
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY