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Ceria-carbon-sulfur composite, method for preparing same, and positive electrode and lithium-sulfur battery comprising same

A cerium dioxide and carbon composite technology, applied in the direction of cerium oxide/cerium hydroxide, lanthanide oxide/hydroxide, rare earth metal oxide/hydroxide, etc. Performance of electrochemical properties and other issues to achieve the effect of improving stability

Active Publication Date: 2020-09-04
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemisorption materials such as metal oxides have low electrical conductivity, which causes a problem that electrochemical characteristics cannot be fully expressed

Method used

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  • Ceria-carbon-sulfur composite, method for preparing same, and positive electrode and lithium-sulfur battery comprising same
  • Ceria-carbon-sulfur composite, method for preparing same, and positive electrode and lithium-sulfur battery comprising same
  • Ceria-carbon-sulfur composite, method for preparing same, and positive electrode and lithium-sulfur battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] Water is prepared by mixing an aqueous dispersion of multi-walled carbon nanotubes (MWCNT, diameter: 10nm-20nm) and polystyrene (PS, diameter: 500nm-600nm) colloidal solution at a ratio of MWCNT:PS=1g:3.5g Dispersions.

[0166] Polystyrene-carbon nanotube (PS-MWCNT) composites were prepared by spray-drying the dispersion at 140° C. (Labplant, SD-Basic). PS-MWCNT composites were recovered, followed by heat treatment at 500 °C for 2 h in an argon (Ar) atmosphere to remove polystyrene to fabricate CNT aggregates with hierarchical pore structures ( figure 2 ).

[0167] 0.45 g of the obtained carbon nanotube aggregates and 0.9 g of Ce(NO 3 ) 3 ·6H 2 O was added to distilled water and heated to a temperature of 95°C. While maintaining the above temperature, 1.75 g of 6-aminocaproic acid and 0.07 mL of hydrochloric acid were added and hydrothermal synthesis was performed for 5 hours.

[0168] After the synthesis was completed, the mixture was washed several times with d...

Embodiment 2

[0178] The mixture obtained by mixing the ceria-carbon-sulfur compound prepared in Example 1, the conductive material and the binder in a weight ratio of 8:1:1 was dissolved in distilled water to prepare the positive electrode active material slurry, and then This was coated on a current collector having an aluminum foil with a thickness of 20 μm to prepare a positive electrode.

[0179] Carboxymethylcellulose (CMC) was used as the conductive material, and styrene-butadiene rubber (SBR) was used as the binder.

[0180] A lithium-sulfur battery coin-type battery was fabricated using polyethylene as a separator and a lithium foil having a thickness of 45 μm as a negative electrode. At this point, use a mixture of 1M LiFSI and 0.5M LiNO 3 An electrolytic solution prepared by dissolving in a mixed solvent of diglyme and 1,3-dioxolane (volume ratio: 1:1) was used to prepare a coin-type battery.

experiment example 1

[0183] Experimental example 1: Electrochemical characteristics of lithium-sulfur batteries

[0184] The electrochemical performances of the lithium-sulfur batteries prepared in Example 2 and Comparative Example 2 were characterized.

[0185] Capacity characteristics and Coulombic efficiency were measured at a charge / discharge voltage range of 1.5V to 2.8V, a discharge C rate of 1C, and a charge C rate of 1C, and the results are shown in Table 1 and Figure 9 middle.

[0186] Table 1

[0187]

[0188] From the results in Table 1, it was confirmed that the lithium-sulfur battery of Example 2 including the ceria-carbon-sulfur complex of Example 1 of the present invention maintained the initial capacity to some extent even after 50 cycles. However, the lithium-sulfur battery of Comparative Example 2 containing the ceria-carbon-sulfur composite of Comparative Example 1 showed a decrease in capacity of about 40% or more after 50 cycles.

[0189] Therefore, it was confirmed t...

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Abstract

The present invention relates to a ceria-carbon-sulfur (CeO2-C-S) composite, a method for preparing the same, and a positive electrode for a lithium-sulfur battery and the lithium-sulfur battery comprising the same. The composite comprise a ceria-carbon (CeO2-C) composite in which cylindrical carbon materials having ceria (CeO2) particles bonded to the surface thereof are intertwined and interconnected in three dimensions; and sulfur introduced into at least a part of the outer surface and the interior of the ceria-carbon composite.

Description

technical field [0001] This application claims priority and benefit to Korean Patent Application No. 10-2018-0030737 filed on March 16, 2018, the entire disclosure of which is incorporated herein by reference in its entirety. [0002] The present invention relates to a ceria-carbon-sulfur composite, a manufacturing method thereof, a positive electrode and a lithium-sulfur battery comprising the ceria-carbon-sulfur composite. Background technique [0003] In recent years, with the rapid development of miniaturization and weight reduction of electronic products, electronic devices, communication devices, etc. and the demand for electric vehicles related to environmental issues has greatly increased, secondary batteries used as power sources for these The demand for performance improvement is also increasing. Among them, lithium secondary batteries have received considerable attention as high-performance batteries due to their high energy density and high standard electrode po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/052C01F17/235C01F17/10C01B32/158C01B17/02
CPCH01M4/38H01M10/052Y02E60/10H01M4/364H01M4/625H01M2004/028C01B32/05C01B17/02H01M4/48H01M4/583H01M10/0525C01P2006/12C01P2006/16H01M4/0416H01M4/0471H01M4/362H01M2004/021
Inventor 梁胜普孙权男文俊赫梁斗景权烔辉黄正泰
Owner LG ENERGY SOLUTION LTD
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