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Sulfur-carbon composite and lithium secondary battery comprising same

A technology of sulfur-carbon composites and lithium secondary batteries, which is applied in secondary batteries, alkali metal sulfides/polysulfides, sulfur compounds, etc., can solve problems such as difficulty in moving lithium ions, and improve performance and utilization , the effect of preventing life shortening

Pending Publication Date: 2020-12-18
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in the case of the sulfur-carbon composite proposed in these documents, there is a problem that since polyaniline is coated in a thin film, the movement of lithium ions becomes difficult

Method used

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  • Sulfur-carbon composite and lithium secondary battery comprising same
  • Sulfur-carbon composite and lithium secondary battery comprising same
  • Sulfur-carbon composite and lithium secondary battery comprising same

Examples

Experimental program
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preparation example Construction

[0058] Preparation method of sulfur-carbon composite

[0059] The present invention also relates to a method for the preparation of a sulfur-carbon composite comprising a conductive polymer coating, the method comprising the steps of: (S1) preparing a concentrated dispersion comprising a conductive polymer; (S2) mixing sulfur powder and carbon materials are mixed to prepare a sulfur-carbon composite; and (S3) mixing and drying the concentrated dispersion and the sulfur-carbon composite to form a conductive polymer coating on the sulfur-carbon composite.

[0060] Hereinafter, each step of the preparation method of the sulfur-carbon composite according to the present invention will be described in more detail.

[0061] Step (S1)

[0062] In step (S1), a concentrated dispersion containing the conductive polymer can be prepared.

[0063] The conductive polymer may have a shape capable of forming a network-type coating. The specific type and shape of the conductive polymer is ...

preparation example 1

[0111] Preparation Example 1: Synthesis of Polyaniline Nanofibers

[0112] According to Jiaxing Huang et al. (Nanofiber Formation in the Chemical Polymerization of Aniline: A Mechanistic Study (Nanofiber Formation in the Chemical Polymerization of Aniline: A Mechanistic Study), Angew.Chem.Int.Ed., 2004, 43, 5817-5821) as a conductive Synthesis of polymeric polyaniline nanofibers.

[0113] Aniline was dissolved in 1M HCl to prepare 100 ml of a 0.32M aniline solution.

[0114] Ammonium persulfate was dissolved in 1M HCl to prepare 100 ml of a 0.08M ammonium persulfate solution.

[0115] The aniline solution and the ammonium persulfate solution were mixed to obtain a mixed solution.

[0116] When the mixed solution was formed, an initial reaction was performed while rapidly mixing at room temperature, followed by further reaction for 10 hours in the state of the mixed solution to prepare a polyaniline nanofiber dispersion.

Embodiment 1

[0118] (1) Preparation of sulfur-carbon composites

[0119] (1-1) Preparation of concentrated dispersion containing conductive polymer

[0120]The polyaniline nanofiber dispersion obtained in Preparation Example 1 was filtered to filter out the polyaniline nanofibers except for the remaining reactants, and then these materials were redispersed in water and filtered several times to neutralize the pH value to 6 above, thereby obtaining a concentrated dispersion of polyaniline nanofibers with a concentration of 5%.

[0121] (1-2) Preparation of sulfur-carbon complex

[0122] Carbon nanotubes and sulfur were mixed at a weight ratio of 25:75, and sulfur was supported on carbon by melt diffusion at 155° C. to prepare a sulfur-carbon composite.

[0123] (1-3) Formation of network-type conductive polymer coating

[0124] The concentrated dispersion of polyaniline nanofibers obtained in (1-1), the sulfur-carbon composite obtained in (1-2), and ethanol were mixed in a weight ratio...

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Abstract

The present invention relates to a sulfur-carbon composite and a lithium secondary battery comprising same. More specifically, a network-shaped coating layer comprising a conductive polymer is formedon the surface of the sulfur-carbon composite, and thus the conductivity of the sulfur-carbon composite is enhanced and also, lithium ions move freely, and accordingly, when applied to lithium secondary batteries, the sulfur-carbon composite can enhance the performance of batteries.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0112636 filed on September 20, 2018 and Korean Patent Application No. 10-2019-0111292 filed on September 9, 2019, which Korean Patent The entire content of the application is incorporated herein by reference. [0002] The invention relates to a sulfur-carbon composite suitable for positive electrode materials for lithium secondary batteries and a lithium secondary battery containing the sulfur-carbon composite. Background technique [0003] Recently, with the rapid development of the fields of electronic devices and electric vehicles, the demand for secondary batteries is increasing. In particular, with the trend toward miniaturization and weight reduction of portable electronic devices, there is an increasing demand for secondary batteries with high energy density that can cope with the trend. [0004] Among secondary batteries, a lithium-sulfur battery is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/58H01M4/60C01B32/168H01M10/052C01B17/02
CPCY02E60/10C01B32/168H01M4/38H01M10/052C01B17/0248C01B17/22H01M2004/028H01M4/139H01M4/13H01M4/136H01M4/1397H01M4/366H01M4/5815H01M4/624H01M4/625H01M4/362H01M4/62H01M4/60C01B17/0243H01M4/583H01M4/608H01M10/0525
Inventor 金奉洙孙权男
Owner LG ENERGY SOLUTION LTD