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Polyvinylpyrrolidone modified graphene coated sulfur/porous carbon composite anode material and preparation method thereof

A polyvinylpyrrolidone and graphene coating technology, applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve problems such as low electrochemical performance, achieve high content, improve active material utilization, and inhibit dissolution loss. Effect

Active Publication Date: 2014-10-01
HARBIN INST OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problem of low electrochemical performance of existing graphene-coated sulfur-containing composite materials, and provides polyvinylpyrrolidone-modified graphene-coated sulfur / porous carbon composite cathode materials and a preparation method thereof

Method used

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  • Polyvinylpyrrolidone modified graphene coated sulfur/porous carbon composite anode material and preparation method thereof
  • Polyvinylpyrrolidone modified graphene coated sulfur/porous carbon composite anode material and preparation method thereof
  • Polyvinylpyrrolidone modified graphene coated sulfur/porous carbon composite anode material and preparation method thereof

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specific Embodiment approach 1

[0042] Embodiment 1: The polyvinylpyrrolidone-modified graphene-coated sulfur / porous carbon composite material in this embodiment is to uniformly coat the polyvinylpyrrolidone-modified graphene sheet on the outer surface of the sulfur / porous carbon composite particle, and Polyvinylpyrrolidone-modified graphene-coated sulfur / porous carbon composite particles form a graphene conductive network; the polyvinylpyrrolidone-modified graphene-coated sulfur / porous carbon composite has a hierarchical core-shell structure, sulfur / porous The carbon composite is the core, and the polyvinylpyrrolidone-modified graphene is evenly coated on the outer surface of the sulfur / porous carbon composite particles to become a protective shell, and the polyvinylpyrrolidone is simultaneously adsorbed on the graphene and sulfur / porous carbon composites. On the surface of graphene, a considerable number of fixed connection points are established between graphene and sulfur / porous carbon composites, so that...

specific Embodiment approach 2

[0044] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the mass ratio of sulfur, porous carbon, polyvinylpyrrolidone and graphene coating is 1:(0.05~2):(0.002~0.2):(0.05 ~2). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0045] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the mass ratio of sulfur, porous carbon, polyvinylpyrrolidone and graphene coating is 1:(0.1~1):(0.005~0.1):(0.1 ~1). Others are the same as in the first embodiment.

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Abstract

The invention relates to a polyvinylpyrrolidone modified graphene coated sulfur / porous carbon composite anode material and a preparation method thereof, which relates to a sulfur / carbon composite material applied to a lithium-sulfur secondary battery anode material and a preparation method of the composite material, and solves the technical problem of the existing lithium-sulfur battery anode material graphene-coated sulfur-containing composite material that the electrochemical property is low. The polyvinylpyrrolidone modified graphene coated sulfur / porous carbon composite material is characterized in that the outer surface of a sulfur / porous carbon composite material particle is uniformly coated with a polyvinylpyrrolidone modified graphene slab layer, a graphene conductive network is formed between every two adjacent particles, and a grading core-shell structure is formed. The preparation method comprises the steps of adding the sulfur / porous carbon composite material into graphene slurry modified by the polyvinylpyrrolidone, and mixing the sulfur / porous carbon composite material with the graphene slurry, and coating the sulfur / porous carbon composite material with the graphene slurry modified by the polyvinylpyrrolidone. The anode material is high in specific capacity, long in cycle life and good in high-rate performance.

Description

technical field [0001] The invention belongs to the field of lithium secondary batteries, in particular to a polyvinylpyrrolidone-modified graphene-coated sulfur / porous carbon composite material used 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...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/38
CPCH01M4/366H01M4/38H01M4/625H01M10/052H01M2004/021Y02E60/10
Inventor 贾铮李振华韦华宇李程远
Owner HARBIN INST OF TECH
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