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A preparation method of graphene-based composites with CO1-Xs embedded between layers

A graphene-based, composite material technology, applied in the direction of electrical components, battery electrodes, alkaline batteries, etc., can solve the problems of poor hydrogen storage performance, low performance, poor cycle stability, etc., to achieve improved hydrogen storage performance, electrochemical storage The effect of excellent hydrogen performance

Active Publication Date: 2018-08-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve existing Co 1-x The technical problems of poor hydrogen storage performance, low performance under high-density discharge current, and poor cycle stability of S and graphene composites provide an interlayer intercalated Co 1-x The preparation method of the graphene-based composite material of S

Method used

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  • A preparation method of graphene-based composites with CO1-Xs embedded between layers
  • A preparation method of graphene-based composites with CO1-Xs embedded between layers
  • A preparation method of graphene-based composites with CO1-Xs embedded between layers

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specific Embodiment approach 1

[0022] Specific implementation mode 1: The interlayer embedding of Co in this embodiment mode 1-x The graphene-based composite of S is composed of Co 1-x The sandwich layer structure of S and graphene composite, Co 1-x S is embedded in the middle of graphene sheets, where graphene and Co 1-X The molar ratio of S is 1:(0.9~1.5).

specific Embodiment approach 2

[0023] Embodiment 2: Prepare the interlayer embedded Co described in Embodiment 1 1-x The preparation method of the graphene-based composite material of S is carried out in the following steps:

[0024] 1. Mix graphene and sulfur powder according to the molar ratio of 1:(1~1.5) to obtain mixed powder I;

[0025] 2. Press ZrO 2 The mass ratio of the grinding ball to the mixed powder I is (18-20):1, and the ZrO 2 Grinding balls and mixed powder Ⅰ loaded with ZrO 2 Fill the lined ball milling tank with high-purity argon gas, and finally fix the ball milling tank in the ball mill, and mill for 24-30 hours at the speed of the ball mill at 900-1000 rpm. After the ball milling is completed, the ball milling tank is cooled to room temperature, and Graphene / S / graphene powder;

[0026] Three, the mol ratio of S and Co in the graphene / S / graphene powder is 1:(0.9~1) the graphene / S / graphene powder prepared in step 2 is mixed with cobalt powder, obtains mixed powder II;

[0027] 4. Pre...

specific Embodiment approach 3

[0028] Embodiment 3: This embodiment differs from Embodiment 2 in that the high-purity argon described in steps 2 and 4 refers to argon with a mass percentage concentration greater than 99.999%. Others are the same as in the second embodiment.

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Abstract

The present invention discloses a graphene-based composite material with Co<1-x>S embedded between layers, and a preparation method thereof, relating to the graphene-based composite material and the preparation method thereof. The present invention aims to solve technical problems that an existing Co<1-x>S-graphene composite material has poor hydrogen storage performance, and poor performance and poor cycle stability in a case of high-density discharge current. The composite material of the present invention has a sandwich structure compounded by Co<1-x>S and graphene. Co<1-x>S is embedded between graphene sheets, wherein a molar ratio of graphene to Co<1-x>S is 1:(0.9-1.5). The preparation method comprises the steps of mixing graphene and sulfur powder and ball milling, and then adding cobalt powder, mixing and ball milling, so as to obtain the graphene-based composite material with Co<1-x>S embedded between layers. A maximum hydrogen storage capacity of a hydrogen storage alloy electrode prepared by the composite material is 3.73wt%. After 50 times of cycling of a battery prepared by the composite material, a hydrogen storage capacity is still above 88%. The graphene-based composite material with Co<1-x>S embedded between layers can be applied to the field of hydrogen storage.

Description

technical field [0001] The invention relates to a preparation method of a graphene-based composite material. Background technique [0002] Hydrogen is extremely abundant in nature, has the highest energy-to-mass ratio, and is clean and non-polluting. It is expected to become a major clean energy in the future energy. However, hydrogen energy is not easy to store and difficult to use on a large scale. Scientists have studied it for a long time. It is found that some carbon materials, such as activated carbon, carbon nanotubes and graphene, can reversibly store hydrogen atoms in them through electrochemical processes. Extensive research has been carried out. Among them, graphene is a new carbonaceous material in which carbon atoms are closely packed into a single-layer two-dimensional honeycomb lattice structure. It has a very high specific surface area, excellent crystallinity and electrical properties. It can be obtained by surface modification. Very ideal composite hydrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/24
CPCH01M4/366H01M10/24Y02E60/10
Inventor 秦伟韩璐高鹏
Owner HARBIN INST OF TECH