Method for preparing carbon nanostructure comprising molybdenum disulfide, lithium secondary battery cathode comprising carbon nanostructure comprising molybdenum disulfide, prepared thereby, and lithium secondary battery comprising same

A carbon nanostructure, lithium secondary battery technology, applied in secondary batteries, nanocarbons, molybdenum sulfide, etc., can solve problems such as complex methods, and achieve the effects of improving stability, suppressing side reactions, and increasing specific surface area

Active Publication Date: 2020-12-15
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] Despite these ongoing efforts, these methods are not only complex but also have the problem of limiting the amount of sulfur that can be added as an active material

Method used

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  • Method for preparing carbon nanostructure comprising molybdenum disulfide, lithium secondary battery cathode comprising carbon nanostructure comprising molybdenum disulfide, prepared thereby, and lithium secondary battery comprising same
  • Method for preparing carbon nanostructure comprising molybdenum disulfide, lithium secondary battery cathode comprising carbon nanostructure comprising molybdenum disulfide, prepared thereby, and lithium secondary battery comprising same
  • Method for preparing carbon nanostructure comprising molybdenum disulfide, lithium secondary battery cathode comprising carbon nanostructure comprising molybdenum disulfide, prepared thereby, and lithium secondary battery comprising same

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[0052] Method for preparing carbon nanostructures comprising molybdenum disulfide

[0053] The method for preparing a carbon nanostructure comprising molybdenum disulfide may include the following steps: (1) preparing a mixed solution by adding the carbon nanostructure to a solution containing a molybdenum precursor; (2) drying the mixed solution to removing the solvent and then mixing the resultant with sulfur to melt-diffuse; and (3) heat-treating the melt-diffused mixture from step (2).

[0054] An aqueous solution may be prepared by dissolving a molybdenum precursor in an aqueous solvent, and preferably, the molybdenum precursor may be dissolved in deionized water (DIW) and then used.

[0055] Molybdenum precursors according to the present invention are those capable of reacting with sulfur to form molybdenum disulfide (MoS 2 ) material, and preferably ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O). Although molybdenum precursors are diverse in their types, when ...

Embodiment 1

[0122] Example 1: Preparation of carbon nanostructures containing molybdenum disulfide

[0123] As a molybdenum precursor solution, 0.4 g of ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O) (Junsei Chemical Co.) was dissolved in deionized water (DIW) to prepare an 8.1 mM aqueous solution. Subsequently, 2 g of carbon nanotubes (CNTs) were added to a solution of polyvinylpyrrolidone (PVP, Zhangzhou Huafu Chemical Co., Ltd.) as a dispersant to prepare carbon nanotubes coated with PVP on the surface. The PVP-coated CNTs were added to the above aqueous solution of ammonium molybdate, followed by mortar mixing for 10 minutes (or hours).

[0124] The mixed solution was dried in a convection oven at 80° C. for 6 hours to completely evaporate the solvent and thereby obtain a black dry powder. 2.6 g of this dry powder and 0.6 g of sulfur (Mo:S=1:8 molar ratio) were mortar mixed for 10 minutes (or hours). Afterwards, the sulfur mixture was melt-diffused in a convection oven at 15...

Embodiment 2

[0126] Example 2: Preparation of carbon nanostructures containing molybdenum disulfide

[0127] Except adding the aqueous solution of the molybdenum precursor of 19.1mM and the sulfur of 1.4g so that the molybdenum disulfide based on the total product is 30% by weight on the surface, prepared in the same manner as in Example 1 Carbon nanotubes of molybdenum disulfide.

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Abstract

The present invention relates to a method for preparing a carbon nanostructure comprising molybdenum disulfide and, more specifically, provides a method for preparing a carbon nanostructure having molybdenum disulfide located on the surface thereof, by melt-diffusing and heat treating a mixture of a molybdenum precursor, a carbon nanostructure and sulfur. In addition, the present invention relatesto: a lithium secondary battery cathode comprising, as an additive, a carbon nanostructure comprising molybdenum disulfide; and a lithium secondary battery comprising same, and in the lithium secondary battery comprising the cathode in which the carbon nanostructure comprising molybdenum disulfide is applied, the carbon nanostructure comprising molybdenum disulfide adsorbs lithium polysulfide (LiPS) to be generated during charging / discharging of the lithium secondary battery, thereby increasing the charging / discharging efficiency of a battery and improving lifespan characteristics.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0102690 filed on August 30, 2018 and Korean Patent Application No. 10-2018-0102699 filed on August 30, 2018, said Korean The entire content of the patent application is incorporated herein by reference. [0002] The present invention relates to a method for preparing a carbon nanostructure containing molybdenum disulfide that can be used as a positive electrode additive for a lithium secondary battery, and a lithium secondary battery containing the carbon nanostructure containing molybdenum disulfide prepared therefrom as a positive electrode additive A positive electrode and a lithium secondary battery having improved discharge characteristics having the same. Background technique [0003] Since the 1990s, secondary batteries, which are power storage devices capable of continuous charging and discharging, have become important electronic components of porta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M4/36H01M4/38H01M10/052H01M4/58C01B32/178C01G39/06
CPCH01M4/38C01G39/06Y02E60/10H01M4/625H01M10/0525H01M2004/028H01M4/136H01M4/364H01M4/628C01P2004/03C01P2004/04C01P2002/72C01P2002/85C01P2002/88C01B32/15H01M4/0471H01M4/1397H01M4/583
Inventor 芮成知孙权男
Owner LG ENERGY SOLUTION LTD
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