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Electrolytic solution for lithium secondary battery, and lithium secondary battery comprising same

A secondary battery and electrolyte technology, which is applied in the field of lithium secondary battery and lithium secondary battery electrolyte, to achieve the effects of small thickness change, improved power characteristics, improved cycle characteristics and stability

Pending Publication Date: 2020-10-16
SK ON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, satisfactory results have not yet been obtained, and there is still a need for a high-voltage lithium secondary battery with improved life characteristics, high-temperature stability, etc., without capacity reduction at high voltage

Method used

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  • Electrolytic solution for lithium secondary battery, and lithium secondary battery comprising same
  • Electrolytic solution for lithium secondary battery, and lithium secondary battery comprising same
  • Electrolytic solution for lithium secondary battery, and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] [Example 1] Pentyl difluorophosphite (Pentyldifluorphosphite, CH 3 (CH 2 ) 4 OPF 2 ; hereinafter referred to as "PDFP")

[0109]

[0110] Step 1: Pentyldichlorophosphite (Pentyldichlorophosphite, CH 3 (CH 2 ) 4 OPCl 2 ) preparation

[0111]

[0112] Tetrahydrofuran (200 mL) was added to a 500 mL flask. Phosphorus trichloride (PCl 3 ) (56mL, 0.57mol) and stirred for 10 minutes, then using ice water, the temperature was lowered to a low temperature state of about 0°C. 1-Pentanol (50 g, 0.57 mol) was slowly added dropwise thereto for 30 minutes, then the temperature was raised to normal temperature, and stirred for 3 hours. The reaction mixture was reduced to vacuum to remove volatiles. Analysis was performed using NMR equipment to identify residues and final products. The final product obtained after reduced pressure was pentyl dichlorophosphite (75 g, 0.40 mol) with a purity of almost 100% and a yield of 70%.

[0113] 1 H NMR (500MHz, C 6 D. 6 )δ0.9...

Embodiment 2

[0118] [Example 2] Octyl difluorophosphite (Octyldifluorphosphite, CH 3 (CH 2 ) 7 OPF 2 ; hereinafter referred to as "ODFP")

[0119]

[0120] Step 1: Octyldichlorophosphite (Octyldichlorophosphite, CH 3 (CH 2 ) 7 OPCl 2 ) preparation

[0121]

[0122] Under a nitrogen atmosphere, acetonitrile (15 mL) was added to a 100 mL flask, followed by phosphorus trichloride (PCl 3 ) (5 mL, 57.3 mmol), and the temperature was lowered to -15 °C using brine and dry ice. A solution of 1-octanol (5.97 g, 45.8 mmol) dissolved in acetonitrile (15 mL) was slowly added dropwise thereto for 1 hour, and then the temperature was raised to normal temperature and stirred for 3 hours. The reaction mixture was depressurized to vacuum to remove the solvent, and by further distillation under reduced pressure, octyl dichlorophosphite (6.00 g, 26.0 mmol) was obtained as the final product in a yield of 56.6%.

[0123] 1 H NMR (500MHz, C 6 D. 6 )δ3.85(qui,2H),1.24(m,4H),1.14(m,4H),1.02(m,4...

Embodiment 3

[0128] [Example 3] 2-(2-ethoxyethoxy) ethyl difluorophosphite (2-(2-ethoxyethoxy) ethyldifluorophosphite, CH 3 CH 2 O(CH 2 ) 2 O(CH 2 ) 2 OPF 2 ; hereinafter referred to as "EEEDFP")

[0129]

[0130] Step 1: 2-(2-ethoxyethoxy)ethyl dichlorophosphite (2-(2-ethoxyethoxy)et hyldichlorophosphite, CH 3 CH 2 O(CH 2 ) 2 O(CH 2 ) 2 OPCl 2 ) preparation

[0131]

[0132] Under a nitrogen atmosphere, dichloromethane (38 mL) was added to a 100 mL flask, followed by phosphorus trichloride (PCl 3 ) (5 mL, 57.3 mmol), and the temperature was lowered to 0 °C. 2-(2-Ethoxyethoxy)ethanol (7.54 g, 56.2 mmol) was slowly added dropwise thereto for 1 hour, and then the temperature was raised to normal temperature and stirred for 4 hours. The reaction mixture was depressurized to vacuum to remove the solvent to obtain 2-(2-ethoxyethoxy)ethyl dichlorophosphite (11.08 g, 47.1 mmol) in 83.9% yield as the final product.

[0133] 1 H NMR (500MHz, C 6 D. 6 )δ3.85(qui,2H),3.32(s,4...

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PUM

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Abstract

The present invention relates to an electrolytic solution for a lithium secondary battery, and a lithium secondary battery comprising the same. The lithium secondary battery according to the present invention employs the electrolytic solution for the lithium secondary battery, containing a difluorophosphite compound, according to the present invention, and thus has improved characteristics.

Description

technical field [0001] The invention relates to a lithium secondary battery electrolyte and a lithium secondary battery containing the lithium secondary battery electrolyte. Background technique [0002] Due to the advantages of high energy density and low self-discharge, lithium secondary batteries have been effectively used as power sources for mobile devices such as smartphones and notebook computers, or electric vehicles. [0003] A lithium secondary battery is composed of a lithium salt as an electrolyte and an electrolytic solution of a nonaqueous solvent that requires a high dielectric constant and high ion conductivity in a wide temperature range in order to dissolve the lithium salt. [0004] In order to meet this requirement, a high-boiling-point solvent represented by propylene carbonate, ethylene carbonate, etc., and a low-boiling-point solvent such as dimethyl carbonate, diethyl carbonate, etc. are mixed and used as a solvent. [0005] In addition, in order to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052H01M4/525H01M4/505
CPCY02E60/10H01M4/525H01M10/0567H01M10/0525H01M2220/20H01M2300/0025H01M10/052H01M4/505H01M2004/028
Inventor 赵仁行朴大仁梁镇赫
Owner SK ON CO LTD
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