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Electrolyte for lithium secondary battery and lithium secondary battery comprising same

A lithium secondary battery and electrolyte technology, applied in the field of electrolytes for lithium secondary batteries and lithium secondary batteries including the same, can solve the problems of electrolyte consumption, poor safety, high temperature performance deterioration, etc., and achieve improved cycle life characteristics, the effect of ensuring high temperature stability

Pending Publication Date: 2021-03-26
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] LiPF most commonly used as electrolyte lithium salt 6 Has the problem of reacting with the electrolytic solvent to promote solvent consumption and generate a large amount of gas
When LiPF 6 When decomposed, it generates LiF and PF 5 , leading to electrolyte consumption in the battery, leading to high temperature performance degradation and poor safety

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

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specific Embodiment approach

[0138] Hereinafter, examples of the present invention and comparative examples are described. However, these examples should not be construed as limiting the scope of the present invention in any sense.

[0139] Manufacture of lithium secondary battery cells

preparation Embodiment 1

[0140] Preparation Example 1: Synthesis of Compound 1-1

[0141] [Compound 1-1]

[0142]

[0143] Trimethylsilylsulfonyl chloride (38.47.53 g, 0.204 mol) was added dropwise to 1,4-divinyl-1,1,4,4,-tetramethyl-1 under cooling , 4-disilazane (19.94 g, 0.101 mol) for 2 hours. Subsequently, the reaction mixture was kept at room temperature (20°C) for 15 hours. Then, the reaction mixture was heated to 110° C. and kept at the same temperature for 5 hours, and at the same time, the reaction product was distilled to remove trimethylsilyl chloride produced therein as a by-product. The resulting product was cooled to room temperature, and then, the remaining reaction product was distilled under vacuum through a short Vigreux column.

[0144] The resulting product was redistilled at a fractionation temperature of 184°C to 188°C / 0.05 Torr to obtain the product as a colorless oil (21.78 g, 60.4%). The corresponding materials are very sensitive to moisture.

[0145] 1H NMR (400 MHz,...

preparation Embodiment 2

[0148] Preparation Example 2: Synthesis of Compound 1-2

[0149] [Compound 1-2]

[0150]

[0151] A mixture of 1,2-bis(chlorodimethylsilyl)ethane (21.53 g, 0.1 mol) and methanesulfonic acid (19.22 g, 0.2 mol) was heated to 65°C for 30 minutes and kept at the same temperature About 1 hour until the reaction with HCl is complete. Subsequently, the temperature of the reaction mixture was raised to 120°C and then kept for 24 hours. The product was cooled to room temperature and distilled under vacuum through Vigreux column distillation. Here, the distillation condenser is kept warm to prevent plugging of the column due to recrystallization of the product therein. The product was treated by partitioning at 162°C to 164°C / 0.05 to obtain the product as a colorless oil (23.19 g, 69.3%).

[0152] 1H NMR (400 MHz, CDCl3), δ 0.33 (s, 12H), 0.75 (s, 4H), 2.93 (s, 6H).

[0153] 13C NMR (100 MHz, CDCl3), delta-1.83(s), 7.45(s), 40.08(s).

[0154] 29Si NMR (80MHz, CDCl3), δ32.39(s) ...

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Abstract

The present disclosure relates to an electrolyte for a lithium secondary battery and a lithium secondary battery comprising same, the electrolyte comprising: a non-aqueous organic solvent; a lithium salt; and an additive, wherein the additive includes a compound represented by formula 1 and a cathodic film former. Formula 1 is as described in the specification.

Description

technical field [0001] An electrolyte for a lithium secondary battery and a lithium secondary battery including the same are disclosed. Background technique [0002] The lithium secondary battery is rechargeable and has an energy density per unit weight that is three or more times higher than that of conventional lead storage batteries, nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and the like. It can also be charged at a high rate, and thus is commercially manufactured for use in notebook computers, mobile phones, electric tools, electric bicycles, etc., and research on improving the additional energy density has been actively conducted. [0003] Such a lithium secondary battery is manufactured by injecting an electrolyte into a battery cell including a positive electrode containing a positive electrode active material capable of intercalating / deintercalating lithium ions and a negative electrode active material capable of intercalating / deinte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/052Y02E60/10C07F7/1804H01M50/107H01M10/0566H01M10/0567H01M2300/0025H01M10/0525H01M10/0568H01M10/0569H01M2004/027H01M4/13
Inventor 禹明希帕维尔·沙图诺夫奥尔加·特萨伊朴寭真李河林林珍赫赵原奭崔玆奉
Owner SAMSUNG SDI CO LTD
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