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Ion chromatography method for measuring lithium salt density in lithiumion cell electrolyte

A lithium ion battery and ion chromatography technology is applied in the field of determining the concentration of salts in the battery electrolyte, which can solve the problems of inconvenient methods, large errors and high equipment requirements, and achieve the effects of stable results and high accuracy.

Inactive Publication Date: 2007-01-03
TIANJIN LISHEN BATTERY
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the large error of the atomic absorption method, the method is inconvenient, and the deficiencies of high equipment requirements, provide a simple and easy, small error, and use ion chromatography to measure the concentration of lithium salt in the electrolyte of lithium ion batteries.

Method used

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  • Ion chromatography method for measuring lithium salt density in lithiumion cell electrolyte
  • Ion chromatography method for measuring lithium salt density in lithiumion cell electrolyte
  • Ion chromatography method for measuring lithium salt density in lithiumion cell electrolyte

Examples

Experimental program
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Embodiment 1

[0017] (1) Take NaF (Aldrich product) 2.210g, KH respectively 2 PO 4 (Aldrich product) 1.433g, diluted with secondary deionized water (18.2MΩ.cm) to a constant volume of 1L, and then diluted with secondary deionized water to concentrations of 20mg / L, 30mg / L, and 40mg / L , 100mg / L standard solution.

[0018] (2) Test above-mentioned standard solution with ion chromatography, make C-A standard curve according to concentration C and peak area response value A, its regression equation and linear coefficient are as shown in table 1.

[0019] anion

[0020] (3) Take 10mL of lithium-ion battery electrolytes with two known lithium salt concentrations (A: 1.12mol / L; B: 1.15mol / L respectively), then add 10mL of reverse aqua regia respectively, and let it stand for 12h .

[0021] (4) The solution after the above reaction is diluted step by step (100 times × 10 times × 2 times), and sent to ion chromatography to test the F - and PO 4 3- Concentration C F- and C PO43- , an...

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Abstract

An ion chromatogram method uses to test the lithium salt (LiPF6) concentration in lithium ion battery electrolyte. (1) Prepare F- and PO43- standard solution in different concentration and test in ion chromatogram method to protract C-A standard curve. (2) Add reverse chloroazotic acid into the need test electrolyte in equal volume and stay for 12-24 hours, then dilute the solution with secondary deionwater step by step and control its concentration inside the concentration range of standard curve. Test the concentration to F- and PO43- in ion chromatogram method at the same condition with step (1). (3) Calculate the lithium salt concentration C1 of the sample in formula (a) according the concentration to F-, calculate the lithium salt concentration C2 of the sample in formula (b) according the concentration to PO43-. It can test the lithium salt concentration according the concentration to F- and PO43- at the same time, and the data of the two groups complement and consult with each other with high veracity.

Description

Technical field: [0001] The invention relates to a method for measuring the concentration of salts in the electrolyte of a battery, in particular to a method for measuring the concentration of lithium salts in the electrolyte of a lithium-ion battery using ion chromatography Background technique: [0002] Lithium-ion battery electrolyte is very sensitive to the energy density, cycle life, safety and other properties of electrodes and batteries. Therefore, choosing a suitable organic electrolyte is one of the key issues to obtain high energy density, long cycle life and battery safety. The initial charge / discharge capacity of the battery varies considerably due to the combination of carbon materials and electrolyte, so special emphasis is placed on the electrolyte being compatible with the carbon anode when designing the battery. In commercial lithium-ion batteries, the lithium salt commonly used in the electrolyte is LiPF 6 , the solvent is a mixture of cyclic alkyl carbon...

Claims

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Application Information

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IPC IPC(8): G01N30/96G01N30/00
Inventor 李慧芳高俊奎张绍丽
Owner TIANJIN LISHEN BATTERY
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