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Electrolyte for lithium secondary battery and lithium secondary battery comprising same

A lithium secondary battery and electrolyte technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, lithium storage batteries, etc., can solve the problems of low reliability of non-aqueous electrolytes and reduced durability of lithium secondary batteries, and achieve excellent reliability , the effect of excellent life characteristics and high output performance

Pending Publication Date: 2022-04-15
DONGWOO FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the case of the above-mentioned documents, not only the reliability of the non-aqueous electrolyte is low, but also the problem that the durability of the lithium secondary battery is reduced when applied to the lithium secondary battery due to this reason.

Method used

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  • Electrolyte for lithium secondary battery and lithium secondary battery comprising same
  • Electrolyte for lithium secondary battery and lithium secondary battery comprising same
  • Electrolyte for lithium secondary battery and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0180] After dissolving 1 equivalent of sodium monofluorophosphate in a dimethylformamide solvent, 2 equivalents of trimethylchlorosilane was added dropwise at 0°C, and the reaction was carried out at room temperature for 2 hours. After the reaction, diethyl ether was added to perform an extraction process, the solvent of the diethyl ether layer was removed, and the remaining volatile substances were removed by vacuum drying, whereby the compound represented by Chemical Formula 2 was synthesized.

[0181] [Chemical formula 2]

[0182]

[0183] The synthesized compounds show 1 H NMR CDCl 3 δ0.3ppm, P-NMR CDCl 3 δ-26ppm, F-NMR CDCl 3 delta-72ppm.

Synthetic example 2

[0185] After dissolving 1 equivalent of the compound represented by Chemical Formula 2 in dimethyl carbonate, adding 1 equivalent of lithium hydroxide, and reacting for 24 hours, the compound represented by Chemical Formula 3 was synthesized.

[0186] [Chemical formula 3]

[0187]

[0188] The synthesized compounds show 1 H NMR CDCl 3 δ0.3ppm, P-NMR CDCl 3 δ-26ppm, F-NMR CDCl 3 δ-72 ppm, ICP-MS Li:P:Si ratio 1:0.9:0.9 (calculated 1:1:1).

Synthetic example 3

[0190] After adding 1 equivalent of the compound represented by chemical formula 2 to 0.6 equivalent of phosphorus pentachloride, when PCl 5 When completely dissolved, the volatile substances are removed by a vacuum pump, and then the compound represented by Chemical Formula 4 is synthesized by distillation and purification.

[0191] [Chemical formula 4]

[0192]

[0193] The synthesized compounds show 1 H NMR CDCl 3 δ0.3ppm, P-NMR CDCl 3 δ-32ppm, F-NMR CDCl 3 delta-71ppm.

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Abstract

The present invention relates to an electrolyte for a lithium secondary battery and a lithium secondary battery comprising the same. The electrolyte for a lithium secondary battery and the lithium secondary battery comprising the same according to the present invention exhibit flame retardancy and thus have the advantage of being able to impart excellent reliability, and have the advantage of high reliability of the battery due to exhibiting high output performance and having excellent life characteristics, high-temperature stability, and high-temperature voltage storage stability.

Description

technical field [0001] The present invention relates to an electrolyte for a lithium secondary battery and a lithium secondary battery including the same. Background technique [0002] With the realization of miniaturization and weight reduction of electronic devices and the spread of the use of portable electronic devices, active research is being conducted on secondary batteries having high energy density as power sources thereof. [0003] Examples of the above-mentioned secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-hydrogen batteries, lithium secondary batteries, and the like, and among these, are emerging that exhibit higher performance than conventional batteries using an aqueous alkaline solution. Research on a lithium secondary battery with a discharge voltage twice or more, high energy density per unit weight, and fast charging. [0004] In general, a lithium secondary battery is manufactured using substances capable of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/056
CPCH01M10/0567C07F9/09C07F9/14C07F9/098Y02E60/10H01M10/0525H01M2300/0025H01M4/131H01M4/525H01M10/4235C07F9/092H01M10/052H01M4/505H01M4/5825H01M2004/028
Inventor 宋錧栯郑景文李相镇
Owner DONGWOO FINE CHEM CO LTD