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Electrolyte additive for lithium secondary battery, electrolyte for lithium secondary battery comprising same, and lithium secondary battery

A lithium secondary battery and electrolyte technology, applied in non-aqueous electrolyte batteries, secondary batteries, lithium batteries, etc., can solve the problems of lithium secondary battery life characteristics and high temperature stability deterioration, improve cycle characteristics, inhibit increase , the effect of suppressing resistance

Pending Publication Date: 2022-04-26
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when an organic electrolyte containing a lithium salt is used as an electrolyte for a lithium secondary battery, the lifespan characteristics and high-temperature stability of the lithium secondary battery may deteriorate due to side reactions between the cathode / anode and the electrolyte

Method used

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  • Electrolyte additive for lithium secondary battery, electrolyte for lithium secondary battery comprising same, and lithium secondary battery
  • Electrolyte additive for lithium secondary battery, electrolyte for lithium secondary battery comprising same, and lithium secondary battery
  • Electrolyte additive for lithium secondary battery, electrolyte for lithium secondary battery comprising same, and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0161] Pre-preparation example 1: preparation of formula 2 compound

[0162] Difluorophosphoric acid (0.075 mol) was slowly added to trimethyl(phenyl)silane (0.075 mol) at 0°C.

[0163] The reaction mixture was stirred at 25°C (room temperature) for 1.5 hours. By evaporation process, the product (H 3 c) 3 Si(O 2 PF 2 ) (9.15 g, 70%).

[0164] 1 H NMR (400MHz, CDCl3) δ=0.34(s).

[0165] 19 F NMR (376.17MHz, CDCl3) δ=-82.3(d, 1 J FP = 985Hz).

[0166] 31 P NMR (161.83MHz, CDCl3) δ=-28.7(t, 1 J FP = 985Hz).

preparation example 2

[0167] Pre-preparation example 2: preparation of formula 3 compound

[0168] Triethylsilyl chloride (0.2 mol) was added to neat difluorophosphoric acid (0.2 mol) using a syringe. The reaction mixture was heat-treated at 65° C. for 6 hours to terminate gas generation, potassium phosphate (20.0 mmol, 0.1 eq, 4.25 g) was added to the reaction mixture, and then an evaporation process was performed. By evaporation, the product was obtained in the state of colorless liquid (45%).

[0169] 1 H NMR (400MHz, CDCl3) δ = 0.34(t), 0.28(q).

[0170] 19 F NMR (376.17MHz, CDCl3) δ=-83.3(d, 1 J FP = 985Hz).

[0171] 31 P NMR (161.83MHz, CDCl3) δ=-27.7(t, 1 J FP = 985Hz).

[0172] Preparation Example 1: Preparation of Electrolyte

[0173] 1.5M LiPF 6 and vinylene carbonate were added to a mixed solvent with a volume ratio of ethylene carbonate (EC), ethylmethyl carbonate (EMC) and dimethyl carbonate (DMC) of 2:4:4, and then The compound of formula 2 obtained in Preparation Examp...

preparation example 3

[0180] Preparation Example 3: Preparation of Electrolyte

[0181] An electrolyte for a lithium secondary battery was prepared in the same manner as Preparation Example 1, except that the content of the compound of Formula 2 was changed to about 0.5 wt% based on the total weight of the electrolyte.

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Abstract

Disclosed are an electrolyte additive for a lithium secondary battery comprising a compound represented by the following Chemical Formula 1, an electrolyte for a lithium secondary battery comprising the same, and a lithium secondary battery comprising the electrolyte. Lt; chemical formula 1gt; in Chemical Formula 1, R1 to R3 are as defined in the detailed description.

Description

technical field [0001] The present disclosure relates to an electrolyte additive for a lithium secondary battery, an electrolyte for a lithium secondary battery containing the same, and a lithium secondary battery. Background technique [0002] Lithium secondary batteries are used as power sources for driving portable electronic devices such as video cameras, mobile phones, and notebook computers. Rechargeable lithium secondary batteries have higher energy density per unit weight than known lead batteries, nickel-cadmium batteries, nickel metal hydride batteries, and nickel-zinc batteries, and can be charged at a high speed. [0003] Since a lithium secondary battery operates at a high driving voltage, an aqueous electrolyte having high reactivity with lithium cannot be used. As an electrolyte for a lithium secondary battery, an organic electrolyte is generally used. Organic electrolytes are prepared by dissolving lithium salts in organic solvents. Preferably, the organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0567H01M10/0525
CPCH01M10/056H01M10/0567H01M10/0525H01M4/525Y02E60/10H01M10/0568H01M10/0569H01M2300/0025C07F9/14C07F5/022C07F9/65742C07F9/65748H01M10/052H01M4/505H01M2004/028
Inventor 奥尔加·特萨伊朴寭真禹明希崔玄奉帕维尔·沙图诺夫
Owner SAMSUNG SDI CO LTD