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Preparation method of graphene-coated sulfur/porous carbon composite cathode material

A composite positive electrode material and graphene-coated technology, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems of low electrochemical performance, achieve high content, slow down dissolution loss, and high specific capacity.

Active Publication Date: 2016-02-03
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention is to solve the technical problem of low electrochemical performance of existing graphene-coated sulfur-containing composite materials, and provide a preparation method of graphene-coated sulfur / porous carbon composite cathode materials

Method used

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  • Preparation method of graphene-coated sulfur/porous carbon composite cathode material
  • Preparation method of graphene-coated sulfur/porous carbon composite cathode material
  • Preparation method of graphene-coated sulfur/porous carbon composite cathode material

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specific Embodiment approach 1

[0044] Embodiment 1: The graphene-coated sulfur / porous carbon composite material of this embodiment is that the outer surface of the sulfur / porous carbon composite particle is uniformly coated with graphene sheets, and the sulfur / porous carbon composite material coated with graphene A graphene conductive network is formed between the carbon composite particles, and the graphene-coated sulfur / porous carbon composite has a hierarchical core-shell structure, and the mass ratio of sulfur, porous carbon and graphene coating is 1:(0.02~ 20): (0.02~20); wherein, the sulfur / porous carbon composite material is that sulfur is dispersed on the surface of the porous carbon material and in the pores, and the porous carbon is composed of activated carbon, graphene, carbon black, carbon nanotubes, template porous One or more of carbon, carbon fiber, carbon aerogel, and carbide-derived carbon.

[0045] The graphene-coated sulfur / porous carbon composite material of the present embodiment unifo...

specific Embodiment approach 2

[0046] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass ratio of sulfur, porous carbon and graphene coating is 1:(0.1-2):(0.1-2). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0047] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the mass ratio of sulfur, porous carbon and graphene coating is 1:0.33:0.17. Others are the same as in the first embodiment.

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Abstract

The invention provides a grapheme-coated sulfur / porous carbon composite material and a preparation method thereof, and relates to a grapheme-coated sulfur / porous carbon composite material used as the positive electrode material of a lithium-sulfur secondary battery and a preparation method thereof. The grapheme-coated sulfur / porous carbon composite positive electrode material provided by the invention can be used for solving the technical problem that the existing grapheme-coated sulfur-containing composite material used as the positive electrode material of a lithium-sulfur battery is low in electrochemical properties. The external surface of each of the particles of the grapheme-coated sulfur / porous carbon composite material provided by the invention is evenly covered with a graphene sheet, and a graphene conductive network is formed between the particles; the obtained grapheme-coated sulfur / porous carbon composite material has a hierarchical core-shell structure. The preparation method of the grapheme-coated sulfur / porous carbon composite material is obtained by adding a sulfur / porous carbon composite material to graphene slurry which is stable for a long time and in which graphene sheets are highly dispersed in water for mixing and coating. The positive electrode material has high specific capacity, long cycle life and excellent high-rate performance. Besides, the grapheme-coated sulfur / porous carbon composite material can be used as the positive electrode material of a lithium secondary battery.

Description

technical field [0001] The invention belongs to the field of lithium secondary batteries, and in particular relates to a graphene-coated sulfur / porous carbon composite material for lithium-sulfur battery cathode materials and a preparation method thereof. Background technique [0002] With the technological revolution in the field of new energy and the rapid development of intelligent and mobile electronic equipment, the research and development of batteries for electric vehicles, energy storage and electronic products has attracted widespread attention. Lithium-ion batteries currently occupying an absolute dominant position in the market cannot meet the requirements of high energy density due to the limited theoretical capacity of lithium-intercalated cathode materials. A new generation of lithium secondary battery cathode materials with high specific capacity, high rate performance, and high safety performance has become the battery industry. The key to upgrading. The the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/38H01M4/625H01M4/628Y02E60/10
Inventor 贾铮李振华韦华宇程俊涵
Owner HARBIN INST OF TECH
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