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Secondary battery comprising sulfur particle having core-shell structure

A technology of sulfur secondary battery and shell structure, which is applied in the field of porous conductive sulfur nanocomposite materials, and can solve the problems of lifespan reduction and other problems

Active Publication Date: 2015-11-25
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a self-discharge effect may occur in lithium-sulfur secondary batteries due to the reciprocating phenomenon of polysulfides that can further cause life-span degradation of lithium-sulfur batteries

Method used

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  • Secondary battery comprising sulfur particle having core-shell structure
  • Secondary battery comprising sulfur particle having core-shell structure
  • Secondary battery comprising sulfur particle having core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] The following examples illustrate the invention without intending to limit it.

[0029] Embodiment (sample 2)

[0030] 1) Sulfur was added to toluene and dispersed using an ultrasonic generator.

[0031] 2) Polyoxyethylene polyoxypropylene as a copolymer was added thereto, and redispersed using an ultrasonic generator.

[0032] 3) When the sulfur-copolymer micelles were stabilized, the carbon material dispersed in the same solvent was added to sulfur and polyoxyethylene polyoxypropylene in toluene, and then, redispersed using an ultrasonic generator.

[0033] 4) The resulting material was freeze-dried using liquid nitrogen to obtain a nanocomposite material with a core / shell structure.

[0034] 5) A slurry was prepared by mixing the prepared nanocomposite material having a core / shell structure, a conductive material, a binder, and NMP (N-methylpyrrolidone) as a solvent. A ball mill, a mortar, a planetary mixer, a homomixer, and the like can be used for mixing.

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Abstract

Disclosed is a method of preparing a sulfur particle having a core-shell structure for a secondary battery. In particular, the method includes using Inverse Miniemulsion reaction and coating a carbon-based conducting material on the outer wall of the sulfur particle, to form a micronet from the carbon-based conducting material. Accordingly, self-discharge effect of the secondary batter may be reduced and life time may be improved by inhibiting loss of polysulfide during charge / discharge.

Description

technical field [0001] The present invention relates to a porous conductive sulfur nanocomposite material with a core-shell structure for preventing the polysulfide shuttle phenomenon (polysulfide shuttle phenomenon) inside a lithium-sulfur secondary battery (lithium-sulfur secondary battery). Background technique [0002] Secondary batteries have been used as high-capacity power storage batteries for electric vehicles, battery power storage systems, and the like, and as compact and high-performance energy sources for portable electronic devices such as cellular phones, video cameras, notebook computers, and the like. With the aim of reducing the size and prolonging the continuous use of portable electronic devices, research has been conducted to reduce the weight of components and reduce the power consumption of secondary batteries. In addition to these efforts, secondary batteries may be required to be compact in size and have a considerably high capacity. [0003] As a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/139B82Y40/00
CPCH01M4/58H01M10/0525H01M4/136H01M4/362H01M4/38H01M4/625H01M10/052Y02E60/10H01M4/0404H01M4/5815H01M10/05H01M4/0402H01M4/1393H01M4/366
Inventor 张容准李豪泽朴相镇
Owner HYUNDAI MOTOR CO LTD