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Acid removal method of lithium salt, non-aqueous electrolyte and battery

A technology of non-aqueous electrolyte and lithium salt, which is applied in the field of batteries containing the non-aqueous electrolyte, and can solve the problem of high free acid content of lithium salt

Active Publication Date: 2020-03-24
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the free acid content of lithium salt prepared in the prior art is too high, the present invention provides a new method for removing

Method used

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  • Acid removal method of lithium salt, non-aqueous electrolyte and battery
  • Acid removal method of lithium salt, non-aqueous electrolyte and battery
  • Acid removal method of lithium salt, non-aqueous electrolyte and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Weigh 20g of the crude LiBOB prepared by the liquid phase method, and through testing its free acid content is 6232ppm, the free acid content contained in it is calculated to be about 0.15g. Dissolve 20 g of LiBOB sample in 200 mL of acetone, stir and dissolve at 60 °C to obtain a solution. Then add 2g of KS-6 and 5g of lithium carbonate powder into the solution, and continue to stir for 12h. After heating and stirring, it was cooled to room temperature, and the filter residue was filtered off. Afterwards, the filtrate was rotary evaporated to saturation, 100 mL of toluene was added and stirred again for 6 h until a large amount of LiBOB powder was precipitated, and LiBOB after acid removal was obtained after filtration. The LiBOB after acid removal was tested for free acid, the free acid content was 487ppm, and the acid removal rate was 92.2%.

[0088] The obtained LiBOB after deacidification is carried out nuclear magnetic spectrum C spectrum and B spectrum test, an...

Embodiment 2

[0090] Weighed 30g of crude LiBOB prepared in solid phase, and tested that its free acid content was 6550ppm, and calculated that the free acid content contained in it was about 0.2g. Dissolve 30g of LiBOB sample in 350mL of tetrahydrofuran, stir and dissolve at 80°C to obtain a solution. Afterwards, 2.5 g of graphite and 10 g of sodium hydroxide powder were added to the solution, and stirring was continued for 8 h. After heating and stirring, it was cooled to room temperature, and the filter residue was filtered off. Afterwards, the filtrate was rotary evaporated to saturation, 200 mL of diethyl ether was added and stirred for 4 h again until a large amount of LiBOB powder was precipitated, and LiBOB after acid removal was obtained after filtration. The LiBOB after acid removal was tested for free acid, the free acid content was 617ppm, and the acid removal rate was 90.6%.

[0091] The obtained LiBOB after deacidification is carried out nuclear magnetic spectrum C spectrum ...

Embodiment 3

[0093] Weigh 50g of crude LiBOB prepared in solid phase, and measure the free acid content of 3948ppm, and calculate the free acid content contained in it to be about 0.2g. Dissolve 50g of LiBOB sample in 700mL of tetrahydrofuran, stir and dissolve at 60°C to obtain a solution. Afterwards, 2 g of carbon nanotubes and 1.5 g of triethylamine were added to the solution, and the stirring was continued for 6 h. After heating and stirring, it was cooled to room temperature, and the filter residue was filtered off. Afterwards, the filtrate was rotary evaporated to saturation, 300 mL of xylene was added and stirred again for 8 h until a large amount of LiBOB powder was precipitated, and LiBOB after acid removal was obtained after filtration. The LiBOB after acid removal was tested for free acid, the free acid content was 717ppm, and the acid removal rate was 81.8%.

[0094] The obtained LiBOB after deacidification is carried out nuclear magnetic spectrum C spectrum and B spectrum te...

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Abstract

The invention provides an acid removal method of lithium salt, and particularly relates to an acid removal method of lithium bis(oxalato)borate. The deacidification method comprises the following steps: S1, providing a lithium salt crude product, testing the content of free acid in the lithium salt crude product, and calculating the total amount of the free acid in the lithium salt crude product;S2, heating and dissolving the lithium salt crude product in an organic solvent A to obtain a lithium salt crude product solution; S3, adding carbon and alkali into the lithium salt crude product solution, stirring, cooling, filtering, and carrying out rotary evaporation on the filtrate to obtain a saturated solution; and S4, adding an organic solvent B into the saturated solution, stirring untila solid is separated out, and filtering to obtain the deacidified lithium salt. The deacidification method can effectively remove free acid in the lithium salt, greatly improves the purity and qualityof the lithium salt, and is simple and environment-friendly to operate.

Description

technical field [0001] The present invention relates to the technical field of energy storage batteries, more specifically, to a method for removing acid from lithium salts, a non-aqueous electrolytic solution containing the lithium salt prepared by the above method, and a non-aqueous electrolytic solution containing the non-aqueous electrolytic solution. liquid battery, the lithium salt specifically includes lithium bisoxalate borate and the like. Background technique [0002] Lithium bisoxalate borate is different from traditional fluorine-containing conductive salts. It does not contain hydrogen and fluorine, does not produce gas and toxic substances, and has good hydrolytic stability, thermal stability and electrochemical stability. Lithium bisoxalate borate exhibits excellent film-forming properties during use, and can effectively stabilize graphite negative electrodes in pure PC-based electrolytes, preventing solvent co-embedding and graphite negative electrode peeling...

Claims

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Application Information

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IPC IPC(8): H01M10/0568
CPCH01M10/0568H01M2300/0025Y02E60/10
Inventor 陈步天冯天明余意
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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