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Method for measuring organic component in lithium ion cell electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the direction of measuring devices, material separation, and analysis of materials, can solve the problems of column corrosion, GC system corrosion, and pollution, so as to avoid corrosion and pollution, prolong service life, and avoid Effects of contamination and corrosion

Inactive Publication Date: 2007-01-03
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when GC-MS is used to test the content of organic components in the electrolyte of lithium-ion batteries, the electrolyte lithium salt - lithium hexafluorophosphate will cause corrosion and pollution to the GC system
This is because lithium hexafluorophosphate is easily decomposed to generate LiF and HF. LiF solids are easy to deposit at the liner and column port, and HF will cause irreversible corrosive effects on the column. Therefore, it should be removed before testing with GC-MS system. Removal of lithium salt components, so far, no reports on such methods have been found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Prepare electrolyte solution with DMC, EMC, DEC, EC, PC, then use absolute ethanol as diluent, prepare standard solutions with different concentrations, and then measure with GC-MS to obtain the corresponding abundance value, and according to Draw a standard curve for the mass content and abundance of each solvent in the total solvent;

[0020] (2) Take 10ml of the electrolyte sample to be tested, add 5ml of deionized water to it, shake it fully for 2 minutes, then add 10ml of dichloromethane, shake it again for 10 minutes, let it stand for stratification, take out the lower organic phase solution, and fill it with or without Filtrate in a glass column of sodium carbonate to remove moisture therein;

[0021] (3) Dilute the solution obtained after filtering in step (2) with absolute ethanol so that its concentration is within the range of the standard curve described in step (1);

[0022] (4) Test with GC-MS under the same test conditions as step (1), and calculate ...

Embodiment 2

[0024] (1) Prepare electrolyte solution with DMC, EMC, DEC, EC, PC, then use absolute ethanol as diluent, prepare standard solutions with different concentrations, and then measure with GC-MS to obtain the corresponding abundance value, and according to Draw a standard curve for the mass content and abundance of each solvent in the total solvent;

[0025] (2) Take 10ml of the electrolyte sample to be tested, add 3ml of deionized water to it, shake it fully for 5 minutes, then add 8ml of dichloromethane, shake it again for 12 minutes, let it stand for stratification, take out the lower organic phase solution, and fill it with or without Filtrate in a glass column of sodium carbonate to remove moisture therein;

[0026] (3) Dilute the solution obtained after filtering in step (2) with absolute ethanol so that its concentration is within the range of the standard curve described in step (1);

[0027] (4) Test with GC-MS under the same test conditions as step (1), and calculate t...

Embodiment 3

[0029] (1) Prepare electrolyte solution with DMC, EMC, DEC, EC, PC, then use absolute ethanol as diluent, prepare standard solutions with different concentrations, and then measure with GC-MS to obtain the corresponding abundance value, and according to Draw a standard curve for the mass content and abundance of each solvent in the total solvent;

[0030] (2) Take 10ml of the electrolyte sample to be tested, add 7ml of deionized water to it, shake it fully for 1min, then add 12ml of dichloromethane, shake it again for 8min, let it stand for layers, take out the lower organic phase solution, and fill it with or without Filtrate in a glass column of sodium carbonate to remove moisture therein;

[0031] (3) Dilute the solution obtained after filtering in step (2) with absolute ethanol so that its concentration is within the range of the standard curve described in step (1);

[0032] (4) Test with GC-MS under the same test conditions as step (1), and calculate the composition and...

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Abstract

This is a test organic component method in lithium ion battery electrolyte. (1) Put DMC,EMC,DEC,EC,PC together into electrolyte and use absolute ethyl as thinner to get standard solution. Carry GC-MS test, get corresponding abundance value and protract standard curve according the content and abundance value of each solvent. (2) Add battery electrolyte into separating funnel and deionwater, surge the admixture for 1-5 minutes, add dichloromethane to surge for 8-12 minutes, eliminate lithium salt; extract the underlayer organic solution to filtrate in terrarium with absolute sodium carbonate. (3) Dilute the liquor got from step (2) into absolute ethyl, and keep its concentration accords with the standard curve range to step (1). (4) Carry GC-MS test in the condition as step (1), account the solvent compose and content of the original battery electrolyte in term of the standard curve to step (1). This method can avoid the cauterization to GC-MS test system by lithium salt component in electrolyte without affecting the fix quantify test to organic component.

Description

Technical field: [0001] The invention relates to a method for determining organic components in battery electrolyte, in particular to a method for determining organic components in lithium-ion battery electrolyte. 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 binary, ternary or multi-component system composed of cyclic alkyl carbonates and chain alky...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/00
Inventor 李慧芳高俊奎张绍丽
Owner TIANJIN LISHEN BATTERY
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