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Graphene-sulfur composite electrode material, preparation method and application thereof

A composite electrode and electrode material technology, which is applied in the field of electrochemical batteries, can solve problems such as poor cycle performance and difficult capacity of electrode materials, and achieve the effects of strong adsorption capacity, good electrochemical performance, superior flexibility and conductivity

Active Publication Date: 2014-05-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a graphene-sulfur composite electrode material and its preparation method and application, the electrode material is used for high-energy lithium-sulfur secondary batteries, and solves the problem of electrode materials existing in the application of elemental sulfur in lithium-sulfur secondary batteries The capacity is difficult to play, the cycle performance is poor, etc.

Method used

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  • Graphene-sulfur composite electrode material, preparation method and application thereof
  • Graphene-sulfur composite electrode material, preparation method and application thereof
  • Graphene-sulfur composite electrode material, preparation method and application thereof

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Embodiment 1

[0036] Graphene oxide aqueous solution (50mL) with a graphene oxide content of 2mg / mL was mixed with 3mL sulfur carbon disulfide solution (containing 150mg sulfur), and 15mL ethanol was added and stirred for 2h, then put into a hydrothermal kettle for hydrothermal reaction; hydrothermal reaction The temperature is 180°C, and the reaction time is 12h. During the hydrothermal process, the in-situ reduction self-assembles to form a three-dimensional macroscopic structure of sulfur particles (5-10nm) uniformly distributed and anchored on the graphene surface. See figure 1(III), obtain the graphene-sulfur macroscopic body composite material after freeze-drying at low temperature-70 ℃ for 24h, the elemental sulfur content is 63wt%; Gained graphene-sulfur macroscopic body composite material section, material thickness after pressing under 2MPa pressure It is about 40 μm, and it can be used as an electrode material without metal current collectors, conductive agents and binders for lit...

Embodiment 2

[0039] The difference from Example 1 is:

[0040] The preparation process is based on Example 1, changing the content of sulfur in the hydrothermal reaction solution, using 3mL of sulfur in carbon disulfide solution (containing 100mg of sulfur); the temperature of the hydrothermal reaction is 180 ° C, the reaction time is 12h, in water In situ reduction self-assembly during the thermal process to form a three-dimensional macroscopic structure of sulfur particles (510nm) uniformly distributed and anchored on the graphene surface see figure 1 (IV), and then freeze-dried at -70°C for 24 hours to obtain a graphene-sulfur macroscopic composite material; the content of elemental sulfur in the composite material was 55wt%. The graphene-sulfur composite film is used as the cathode material, and at 300mA·g -1 Under the highest current density, the initial discharge capacity can reach 1240mAh·g -1 , the discharge capacity of the graphene-sulfur composite electrode at various current d...

Embodiment 3

[0042] The difference from Example 2 is:

[0043] The preparation process is based on Example 1. In this example, the content of sulfur in the hydrothermal reaction solution is changed, and 3 mL of sulfur carbon disulfide solution (containing 200 mg of sulfur) is used; the temperature of the hydrothermal reaction is 180 ° C, and the reaction time is 12h, in situ reduction self-assembly in the hydrothermal process to form a three-dimensional macroscopic structure of sulfur particles (5-10nm) uniformly distributed and anchored on the graphene surface see figure 1 (V), and then freeze-dried at -70°C for 24 hours to obtain a graphene-sulfur macroscopic composite material; the content of elemental sulfur in the composite material was 71wt%. The graphene-sulfur composite film is used as the cathode material, and at 300mA·g -1 Under the highest current density, the first discharge capacity can reach 1115mAh·g -1 , the discharge capacity of the graphene-sulfur composite electrode at...

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Abstract

The present invention discloses a graphene-sulfur composite electrode material, a preparation method and an application thereof, and belongs to the field of electrochemical batteries. According to the graphene-sulfur composite electrode material, a uniformly-dispersed graphene oxide aqueous solution, an organic solution of sulfur, and a miscible solvent are subjected to mixing stirring, and then are subjected to a hydrothermal reaction to form a three-dimensional macroscopic body structure with sulfur nanoparticles uniformly distributed and anchored on the fibrous graphene surface, and low temperature freeze-drying is performed to obtain the graphene-sulfur composite material. According to the present invention, the electrode material is the microcosmic structure with sulfur nanoparticles uniformly anchored on the interconnected fibrous graphene surface; and according to the battery design, after the graphene-sulfur material is cut to obtain the corresponding thickness, the obtained material is pressed and then can be directly used as the lithium-sulfur battery positive electrode with no metal current collector, no conductive agent and no adhesive.

Description

technical field [0001] The invention belongs to the technical field of electrochemical batteries, and in particular relates to a graphene-sulfur composite electrode material and its preparation method and application. Background technique [0002] Due to the increasing popularity of mobile communication equipment, notebook computers, mobile phones, etc., the demand for electric vehicles-hybrid electric vehicles, aerospace, military and other fields has continued to increase. The high-efficiency new energy storage devices that serve as the basis for these applications have received great attention from governments in recent years. , has become one of the key areas of research and development. Along with people's demand for various thin and light electronic devices with good mechanical strength, higher requirements are put forward for the development of small, lightweight secondary batteries with high energy density, power density and good cycle stability. Electrode materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCH01M4/13H01M4/139H01M4/362H01M10/052H01M2004/028Y02E60/10
Inventor 李峰周光敏李璐成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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