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Separator and lithium-sulfur battery comprising same

A lithium-sulfur battery and diaphragm technology, applied in the field of lithium-sulfur batteries, can solve the problems of lithium ion path extension, blockage, and inability to ensure battery performance, and achieve the effect of improving stability and high capacity

Active Publication Date: 2019-04-02
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the protective film itself functions as a resistive layer and the path of lithium ions in the electrolyte is lengthened or blocked, so the improvement effect of battery performance cannot be ensured at the desired level

Method used

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  • Separator and lithium-sulfur battery comprising same
  • Separator and lithium-sulfur battery comprising same
  • Separator and lithium-sulfur battery comprising same

Examples

Experimental program
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Embodiment approach

[0102] Hereinafter, Examples, Comparative Examples, and Experimental Examples will be described to help understand the effects of the present invention. However, the following description is only an example of the contents and effects of the present invention, and the scope and effects of the present invention are not limited thereto.

Embodiment 1

[0105] (1) Preparation of diaphragm

[0106] A 16 μm polypropylene (50% porosity) membrane was prepared as a porous substrate.

[0107] An aqueous dispersion of graphene oxide (concentration of 0.01% by weight, thickness of 10 nm, length of 5 μm) and an aqueous dispersion of boron nitride (concentration of 0.1 mg / mL, thickness of 0.2 μm to 0.5 μm, length of 1 μm to 3 μm) and ultrasonic waves were applied thereto for 8 hours to prepare a coating solution (weight ratio: graphene oxide: boron nitride = 1:9).

[0108] The coating solution was poured on the porous substrate, followed by filtration under reduced pressure to form a coating on both sides of the porous substrate, which was dried at 70° C. for 24 hours to prepare a separator. At this point, the coating was measured to have a thickness of about 1.5±0.5 μm.

[0109] (2) Lithium-sulfur battery

[0110] Conductive carbon having electrical conductivity and sulfur were mixed at a weight ratio (% by weight) of conductiv...

experiment example 1

[0117] The lithium-sulfur batteries manufactured in the above examples and comparative examples were driven under the charge / discharge conditions of 0.3C / 0.5C, the initial charge / discharge capacity was measured, and the capacity change was confirmed by performing 200 cycles.

[0118] figure 2 is a graph showing the initial discharge capacity of the lithium-sulfur batteries manufactured in Example 1 and Comparative Examples 1 and 2. refer to figure 2 , it can be seen that compared with Comparative Example 1 without coating and Comparative Example 2 with a single graphene oxide layer, the battery of Example 1 with the coating according to the present invention has a high initial discharge capacity.

[0119] image 3 It is a graph showing the lifetime characteristics of the lithium-sulfur batteries manufactured in Example 1 and Comparative Examples 1 and 2. refer to image 3 , it can be seen that the battery of Example 1 shows a high capacity retention rate and capacity imp...

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Abstract

The present invention relates to a separator and a lithium-sulfur battery comprising same, the separator having at least one side of a porous substrate thereof coated with graphene oxide and boron nitride and thereby being capable of simultaneously solving problems caused by lithium polysulfides and lithium dendrites occurring in conventional lithium-sulfur batteries.

Description

technical field [0001] This application claims priority and benefit from Korean Patent Application No. 10-2016-0180433 filed on December 27, 2016, the disclosure of which is incorporated herein by reference in its entirety. [0002] The present invention relates to a separator capable of simultaneously solving problems caused by lithium polysulfide and lithium dendrites, and a lithium-sulfur battery including the separator. Background technique [0003] Recently, with the rapid development of miniaturization and weight reduction of electronic products, electronic equipment, communication equipment, etc., and environmental issues have been involved, the demand for electric vehicles has greatly increased, and the performance of secondary batteries used as energy sources for these products The demand for improvement is also growing. Among them, lithium secondary batteries have attracted considerable attention as high-performance batteries due to their high energy density and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052H01M50/417H01M50/431H01M50/434H01M50/451H01M50/457H01M50/491H01M50/497
CPCH01M4/366H01M4/38H01M4/382H01M10/052Y02E60/10H01M50/431H01M50/417H01M50/457H01M50/451H01M50/491H01M50/434H01M50/497H01M50/463H01M50/449H01M50/411H01M50/446
Inventor 宋知恩孙权男梁斗景金伦耕
Owner LG ENERGY SOLUTION LTD
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