Electrolyte solution for lithium secondary battery and lithium secondary battery including the same

A lithium secondary battery and electrolyte technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of increased battery internal resistance, increased electrode thickness, etc. The effect of side effects

Pending Publication Date: 2022-02-22
SK ON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, such a lithium secondary battery has a problem in that, under high temperature conditions, as side reactions between the electrolyte and the electrodes are promoted, the thickness of the electrodes increases, and the internal resistance of the battery increases

Method used

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  • Electrolyte solution for lithium secondary battery and lithium secondary battery including the same
  • Electrolyte solution for lithium secondary battery and lithium secondary battery including the same
  • Electrolyte solution for lithium secondary battery and lithium secondary battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to Embodiment 5

[0158] With respect to the basic electrolytic solution of Comparative Example 1, polyethylene glycol dimethyl ether with a weight average molecular weight of about 1000, 2000, 5000, 10000 and 20000 was added so that it was 1% by weight of the total weight of the electrolytic solution, thereby preparing The electrolyte solution of embodiment 1 to embodiment 5.

manufacture example

[0159] Manufacturing example: Manufacturing of lithium secondary batteries

[0160] Mix 92% by weight Li[Ni 0.6 co 0.2 mn 0.2 ]O 2 and Li[Ni 0.8 co 0.1 mn 0.1 ]O 2 The positive electrode active material, 3% by weight polyvinylidene fluoride (PVDF) binder and 5% by weight carbon black conductive material were mixed to prepare positive electrode slurry.

[0161] The positive electrode slurry was uniformly coated on an aluminum foil having a thickness of 15 μm, and dried and pressed to manufacture a positive electrode.

[0162] 97% by weight of negative electrode active material mixed with artificial graphite and natural graphite at a weight ratio of 7:3, 1% by weight of styrene-butadiene rubber (SBR) binder and 2% by weight of carboxymethylcellulose (CMC) Thickener is mixed to prepare negative electrode slurry.

[0163] The negative electrode slurry was uniformly coated on a copper foil with a thickness of 15 μm, then dried and pressed to produce a density of 1.684 g / ...

experiment example 1

[0168] Experimental example 1: Evaluation of life at 45°C (evaluation of capacity retention rate after 600 charge-discharge cycles)

[0169] For the lithium secondary batteries of Examples and Comparative Examples, charge (CC / CV 1C 4.2V 0.1C cut-off (CUT-OFF)) and discharge (CC 1C 2.7V cut-off) were repeated 600 times at 45°C.

[0170] The capacity retention rate after 600 charge-discharge cycles was calculated as a percentage by dividing the discharge capacity at the 600th charge-discharge cycle by the discharge capacity at the first cycle (initial capacity).

[0171] Capacity retention rate (%) = (600th discharge capacity / 1st discharge capacity) × 100

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Abstract

An electrolyte for a lithium secondary battery according to exemplary embodiments may include an organic solvent, a lithium salt, and an additive including a polyalkylene glycol dialkyl ether compound having a weight average molecular weight in a specific range.

Description

technical field [0001] The invention relates to an electrolytic solution for a lithium secondary battery and a lithium secondary battery comprising the electrolytic solution. Background technique [0002] Secondary batteries are batteries that can be repeatedly charged and discharged, and are widely used as power sources for portable electronic communication devices such as camcorders, mobile phones, and notebook computers with the development of the information communication and display industries. In addition, in recent years, battery packs including secondary batteries are being developed and used as power sources for eco-friendly cars such as hybrid cars. [0003] Such secondary batteries include, for example, lithium secondary batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and the like. However, lithium secondary batteries among them have high operating voltage and energy density per unit weight, and are advantageous in charging speed and weight reduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/052
CPCH01M10/0567H01M10/0569H01M10/052H01M2220/30H01M2220/20H01M10/0525H01M10/4235H01M4/525H01M2300/0025H01M2004/028Y02E60/10
Inventor 赵仁行金成镇沈由那
Owner SK ON CO LTD
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