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Electrolyte for lithium secondary battery and lithium secondary battery comprising same

A lithium secondary battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, lithium batteries, etc., can solve the problem of accelerating the side reaction between the electrolyte and the electrode, increasing the thickness of the electrode and the internal resistance of the battery, etc. question

Pending Publication Date: 2022-05-06
SK新能源株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For example, high temperature conditions may accelerate side reactions between the electrolyte and electrodes, leading to an increase in electrode thickness and internal resistance of the battery

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

Embodiment 1 to Embodiment 4

[0143] Except adding the compound represented by Chemical Formula 8 (Example 1), Chemical Formula 9 (Example 2), Chemical Formula 10 (Example 3) or Chemical Formula 11 (Example 4) in an amount of 1% by weight based on the total weight of the electrolytic solution In addition, a lithium secondary battery sample was produced by the same method as in Comparative Example 1.

[0144] [chemical formula 8]

[0145]

[0146] [chemical formula 9]

[0147]

[0148] [chemical formula 10]

[0149]

[0150] [chemical formula 11]

[0151]

Embodiment 5 to Embodiment 8

[0153] In addition to adding 0.5% by weight (Example 5), 0.4% by weight (Example 6), 3% by weight (Example 7) and 4% by weight (Example 8) based on the total weight of the electrolyte A lithium secondary battery sample was produced by the same method as in Comparative Example 1 except for the compounds shown.

experiment example 1

[0154] Experimental example 1: Evaluation of initial performance (room temperature, 25°C)

[0155] (1) Evaluation of initial capacity

[0156] The batteries of Examples and Comparative Examples were charged (0.5C-rate CC / CV, 4.2V; 0.05C cut-off) and discharged (0.5C-rate CC; 2.7V cut-off) three times. The discharge capacity of the third cycle was measured as the initial capacity of the battery.

[0157] (2) Evaluation of the initial thickness of the battery

[0158] The batteries of Examples and Comparative Examples were charged at room temperature (0.5C-rate CC / CV, 4.2V; 0.05C cut-off), and then using a plate thickness measuring device (Mitutoyo Corporation, Japan, 543- 490B) to measure the thickness of the battery.

[0159] (3) Evaluation of internal resistance (charging DC internal resistance (C_DCIR) and discharging DC internal resistance (D_DCIR))

[0160] At the point where the SOC is 60%, change the C-rate to 0.2C, 0.5C, 1.0C, 1.5C, 2.0C, 2.5C, and 3.0C, and...

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Abstract

An electrolyte for a lithium secondary battery includes an organic solvent, a lithium salt, and a pentaerythritol diphosphite compound including at least one substituent selected from the group consisting of a silyl group, a sulfonyl group, a phosphoryl group, and a phosphino group. The invention also provides a lithium secondary battery comprising the electrolyte.

Description

[0001] CROSS-REFERENCE AND PRIORITY CLAIM TO RELATED APPLICATIONS [0002] This application claims priority from Korean Patent Application No. 10-2020-0144888 filed with the Korean Intellectual Property Office (KIPO) on November 3, 2020, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to an electrolytic solution for a lithium secondary battery and a lithium secondary battery including the electrolytic solution. More particularly, the present invention relates to an electrolytic solution for a lithium secondary battery including an organic solvent and a lithium secondary battery including the same. Background technique [0004] With the development of information technology and display technology, secondary batteries that can be repeatedly charged and discharged have been widely used as power sources of mobile electronic devices such as camcorders, mobile phones, notebook computers, and the like. Rece...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/052H01M10/42
CPCH01M10/0567H01M10/0569H01M10/052H01M10/4235H01M2220/20H01M2220/30H01M10/0525H01M2300/0025Y02E60/10C07F9/65746
Inventor 赵仁行金明来金成镇李镇弘
Owner SK新能源株式会社
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