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Preparation method of shape-controlled graphene/Co(OH)2 composite materials

A composite material and graphene technology, used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve problems such as unevenness and affect the electrochemical performance of composite materials, and achieve low hydrothermal temperature and good charge and discharge. The effect of cycle stability and high charge-discharge cycle stability

Active Publication Date: 2016-06-29
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Co(OH) 2 In the process of preparation, the morphology is often uneven, which greatly affects the electrochemical performance of the composite material.

Method used

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  • Preparation method of shape-controlled graphene/Co(OH)2 composite materials
  • Preparation method of shape-controlled graphene/Co(OH)2 composite materials
  • Preparation method of shape-controlled graphene/Co(OH)2 composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Prepare 90 mL of graphene oxide solution with a concentration of 0.5 g / mL, and ultrasonically treat it to obtain a uniform and transparent colloidal solution. 2) Weigh tetrahydrate and 1.2 g of cobalt acetate, slowly add the solution in 1) while stirring, control the rotation speed at 200 r / min, and sonicate for 30 min.

[0034] 3) Add 1.5 mL of 0.01 mol / L sodium hydroxide solution and 15 mg of PEI as a surfactant to the solution obtained in step 2), and stir evenly.

[0035] 4) The obtained solution was transferred into a 100 mL polytetrafluoroethylene-lined stainless steel hydrothermal kettle, and kept at a constant temperature of 150° C. for 15 hours.

[0036] 5) After natural cooling, the gel obtained above was washed three times with deionized water, and freeze-dried under vacuum.

[0037] Adopt Rigaku X-ray diffractometer to determine the crystallinity and the crystal form of the metal oxide in the composite material obtained in the above-mentioned embodiment ...

Embodiment 2

[0041] According to the method of embodiment 1, just change the precipitation agent (0.01M sodium hydroxide solution) in step 3) into 0.2g of urea, change the temperature in step 4) into 170 ℃.

[0042] This graphene / Co(OH) obtained by SEM 2 The shape of the composite material is as figure 2 As shown, it is flower-shaped. The test results of the electrochemical workstation are as follows: Figure 5 As shown in b, the specific capacity is 862F / g. The test results using the blue electric test system are as follows: Figure 6 As shown in b, the capacity retention rate is 93% after 5000 cycles.

Embodiment 3

[0044] According to the method of embodiment 1, just change the precipitation agent (0.01M sodium hydroxide solution) in step 3) into 0.15g of urotropine, change the temperature in step 4) into 180 ℃.

[0045] This graphene / Co(OH) obtained by SEM 2 The shape of the composite material is as image 3 As shown, it is rod-shaped. The test results of the electrochemical workstation are as follows: Figure 5 as shown in c. The test results using the blue electric test system are as follows: Figure 6As shown in c, the initial capacity is as high as 983F / g, and after 5000 cycles, the capacity retention rate is 72%.

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Abstract

The invention belongs to the technical field of a super capacitor nano composite material, and particularly relates to a preparation method of shape-controlled graphene / Co(OH)2 composite materials. According to the preparation method disclosed by the invention, the graphene / Co(OH)2 composite materials with different order shapes are prepared under the hydrothermal condition by using graphene and cobaltous acetate tetrahydrate as raw materials, selecting different precipitators and adopting a suitable surfactant. The preparation method disclosed by the invention is simple; and the prepared composite materials with different shapes have good electrochemical performance and all have high specific capacity, and have high application value in the preparation of the super capacitor material.

Description

technical field [0001] The invention belongs to the technical field of preparation of conductive materials for supercapacitors, in particular to a graphene / Co(OH) with controllable morphology 2 Methods of preparation of composite materials. Background technique [0002] With the current world's energy and environmental issues becoming increasingly prominent, people have made great efforts in the study of renewable energy or clean energy. In the promotion of these new energy sources, high-efficiency energy conversion equipment is crucial. . With the advantages of high power density, long cycle life and fast charge-discharge rate, supercapacitors have gradually attracted great attention, especially in the fields of electronics, industry, energy management and military equipment, which have very broad application prospects. The performance of electrode materials is a key factor in the electrochemical performance of supercapacitors, and the performance of electrode materials h...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/32H01G11/30
CPCY02E60/13H01G11/84H01G11/30H01G11/32
Inventor 蔺华林喻宁波卢德力陈言伟刘金宝韩生祝俊
Owner SHANGHAI INST OF TECH
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