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Quantitatively analyzing method for fluohydric acid in lithium ion battery electrolyte

A lithium-ion battery, quantitative analysis technology, applied in the field of quantitative analysis of hydrofluoric acid in lithium-ion battery electrolyte, to achieve the effect of improving measurement accuracy

Inactive Publication Date: 2005-05-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can overcome the inconsistency between the sudden point of pH value of the solution and the discoloration point of the indicator in the current titration method, thereby greatly improving the accuracy of the measurement results

Method used

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  • Quantitatively analyzing method for fluohydric acid in lithium ion battery electrolyte
  • Quantitatively analyzing method for fluohydric acid in lithium ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The first step is to use a dry 10ml PE material syringe to take 8ml of lithium-ion battery electrolyte in the glove box, seal the needle with silica gel, and transfer the syringe to the air; the lithium-ion battery electrolyte is composed of diethyl carbonate (DEC), γ- Butyrolactone (γ-BL) and LiCF 3 SO 3 、LiBF 4 Mixed composition, wherein γ-BL:DEC=1:2(w), the concentration of the two lithium salts is 0.5mol / L;

[0018] In the second step, add 50.0ml of anhydrous methanol (no drying treatment, water content 0.15%) into the titration cup with a pipette, add 2 grams of electrolyte (weigh the amount of electrolyte injected with a balance, accurate to 0.1mg), start stirring;

[0019] The 3rd step selects concentration and is that the potassium hydroxide of 0.0100mol / L is titrant, starts titration, the consumption of electrolytic solution is input in the potentiometric titrator, input second-order derivation program (Switzerland Metrohm company provides) and acidity calcu...

Embodiment 2

[0022] The first step is to use a dry 10ml PE material syringe to take 8ml of lithium-ion battery electrolyte in the glove box, seal the needle with silica gel, and transfer the syringe to the air; the lithium-ion battery electrolyte is composed of propylene carbonate (PC), dimethoxy diethyl ethane (DME) and LiClO 4 , LiAsF 6 Mixed composition, wherein PC:DME=1:2(w), the concentration of the two lithium salts is 0.5mol / L;

[0023] In the second step, add 50.0ml of absolute ethanol with a pipette in the titration cup (no drying treatment, water content 0.2%), add 2.5 grams of electrolyte (weigh the amount of electrolyte injected with a balance, accurate to 0.1mg), start stirring;

[0024] The 3rd step selects the sodium hydroxide that concentration is 0.0500mol / L to be titrant, starts titration, the consumption of electrolytic solution is input in the potentiometric titrator, input second-order derivation program (Switzerland Metrohm company provides) and acidity calculation ...

Embodiment 3

[0027] The first step is to use a dry 10ml PE material syringe to take 8ml of lithium-ion battery electrolyte in the glove box, seal the needle with silica gel, and transfer the syringe to the air; the lithium-ion battery electrolyte is composed of PC, methyl carbonate (DMC), Tetrahydrofuran (THF) and LiN(CF 3 SO 2 ) 2 Mixed composition wherein PC:DMC:THF=2:3:1 (w), the concentration of lithium salt is 1mol / L;

[0028] The second step is to add 50.0ml of absolute ethanol (without drying process, water content 0.2%) into the titration cup with a pipette, and add 3 grams of electrolyte (weigh the amount of injected electrolyte with a balance, accurate to 0.1mg), start stirring;

[0029] The 3rd step selects the lithium hydroxide that concentration is 0.1000mol / L to be titrant, starts titration, the consumption of electrolytic solution is input in the potentiometric titrator, input second-order derivation program (Switzerland Metrohm company provides) and acidity calculation f...

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Abstract

A quantitative analysis method includes diluting lithium ion cell electrolyte in absolute ethyl alcohol or methyl alcohol, using MOH as titrant, applying automatic potentiometric titration, using (CoXV20) / (1000XM) to confirm titrimetric curve as Co referring to tritrant concentration, V referring to consumed tritrant volume ml, 20 referring to HF molecular weight and M referring to electrolyte weight, using potentiometric titrator to carry out second order derivation of titrimetric curve for cnofirming titrimetric end point.

Description

technical field [0001] The invention relates to the technical field of production and manufacture of lithium-ion battery electrolytes, in particular to a quantitative analysis method for hydrofluoric acid in lithium-ion battery electrolytes. Background technique [0002] Trace amounts of hydrofluoric acid in the non-aqueous electrolyte used in lithium-ion batteries have a great influence on the capacity, cycle life and safety of the battery. Therefore, the content of hydrofluoric acid must be strictly monitored during the production, storage, transportation and battery manufacturing process of lithium-ion battery electrolyte. However, currently reported technologies in this area are extremely rare. Currently, tetrabutylammonium hydroxide (NBu 4 OH) as the titrant, bromothymol blue (BTB) as the indicator, in anhydrous methanol solvent, according to the observed reaction effect of hydrogen fluoride and tetrabutylammonium hydroxide in the electrolyte...

Claims

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Application Information

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IPC IPC(8): G01N27/44G01N31/16
Inventor 左晓希李伟善刘建生
Owner SOUTH CHINA NORMAL UNIVERSITY
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