Preparation method for cobalt sulfide/carbon composite material and product and application therefor

A technology of carbon composite materials and cobalt sulfide, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of complex and unfavorable crystal growth mechanisms, and great influence on the growth process, and achieve good cycle stability. The effect of high specific capacitance and low equipment requirements

Active Publication Date: 2016-06-29
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using these sulfur sources to synthesize metal sulfides, the crystal growth mechanism is often complicated, and the growth process is greatly affected by temperature.
At the same time, metal sulfides, like metal oxides, are semiconductors, which is unfavorable for their application on supercapacitors

Method used

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  • Preparation method for cobalt sulfide/carbon composite material and product and application therefor
  • Preparation method for cobalt sulfide/carbon composite material and product and application therefor
  • Preparation method for cobalt sulfide/carbon composite material and product and application therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of cobalt sulfide / carbon composites

[0033] S1. Under the action of ultrasonic dispersion, cobalt nitrate Co(NO 3 ) 2 and CS 2 mix evenly;

[0034] S2. Transfer the obtained homogeneous solution to a solvothermal reactor so that its volume is filled with 60% of the reactor volume, and the reactor is covered and tightened;

[0035] S3. Put the reaction kettle into a constant temperature oven, carry out solvothermal reaction at 180° C. for 20 hours, then cool to room temperature naturally, centrifuge the resulting mixture, collect the solid product, wash with absolute ethanol and distilled water three times respectively, The obtained solid product is vacuum-dried at 80°C to obtain a cobalt sulfide / carbon composite material.

[0036] The apparent morphology of the prepared cobalt sulfide / carbon composite was observed by scanning electron microscopy, as shown in figure 1 shown. SEM photo ( figure 1 (a), (b)) show that the as-prepared cobalt sulfide / carbo...

Embodiment 2

[0044] Preparation of cobalt sulfide / carbon composites

[0045] S1. Under the action of ultrasonic dispersion, the Co(NO 3 ) 2 and CS 2 mix evenly;

[0046] S2. Transfer the obtained homogeneous solution to a solvothermal reactor so that its volume is filled with 60% of the reactor volume, and the reactor is covered and tightened;

[0047] S3. Put the reaction kettle into a constant temperature oven, perform solvothermal reaction at 220°C for 24 hours, then cool to room temperature naturally, centrifuge the resulting mixture, collect the solid product, wash with absolute ethanol and distilled water 3 times respectively, The obtained solid product is vacuum-dried at 80°C to obtain a cobalt sulfide / carbon composite material.

[0048] The apparent morphology of the prepared cobalt sulfide / carbon composite was observed by scanning electron microscopy, as shown in Figure 4 shown. Scanning electron micrographs show that the prepared cobalt sulfide / carbon composite material pr...

Embodiment 3

[0055] The preparation of the cobalt sulfide / carbon composite material of the present embodiment and the preparation of the supercapacitor electrode sheets are the same as in Example 1, the difference is that cobalt nitrate and carbon disulfide (CS 2 ) The ratio of the amount of substance is 1:1.2.

[0056] Electrochemical performance test

[0057] The electrode prepared above was assembled into a simulated supercapacitor unit in 6mol / L KOH solution for testing.

[0058] At a scanning speed of 5mV / s, the specific capacitance of the obtained cobalt sulfide / carbon composite was 220F / g. After 1000 cycles of charging and discharging, the specific capacitance value of the electrode can be maintained at 94% of the initial value, showing good cycle performance.

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Abstract

The invention provides a preparation method for a cobalt sulfide/carbon composite material and a product and an application therefor. The preparation method comprises the following steps of: S1, enabling a soluble cobalt salt to be mixed with carbon disulfide (CS<2>) to obtain a uniform solution, wherein the ratio of the amount of substance of the soluble cobalt salt to carbon disulfide (CS<2>) is 1:1-1.5; S2, moving the solution obtained in the step S1 to a reaction kettle to be subjected to a solvothermal reaction, wherein the conditions of the solvothermal reaction are as follows: the reaction temperature is 180-220 DEG C and the reaction time is 20-24h; and S3, separating the mixture obtained in the step S2, collecting a solid product, and washing and drying the solid product to obtain the cobalt sulfide/carbon composite material. According to the preparation method, carbon disulfide is skillfully taken as the raw material; the carbon disulfide can be used as the solvent, the sulfur source and the carbon source in the solvothermal reaction; the preparation method is simple, easy to operate and low in equipment requirement; and in addition, the cobalt sulfide/carbon composite material has relatively high specific capacitance and cycling stability and low capacitance degradation.

Description

Technical field [0001] The present invention involves new energy materials and energy storage and conversion devices in the field of technology. More specific, it involves the preparation method and its products and applications of a cobalt sulfide / carbon composite material. Background technique [0002] Super capacitor, also known as electrochemical supercapacitors, is a new type of energy storage and conversion device that has appeared in recent years. It is a new type of energy device between parallel board capacitors and batteries.Compared with traditional parallel board capacitors, supercapacitors have higher energy density, and supercapacitors have higher power density compared to secondary batteries.The electrochemical supercapacitors have small volume, large capacity, fast charging speed, high power density, long circulation life, wide working range, good reliability, and low cost, making it very much in the fields of new energy technology, communication technology, elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/30H01G11/86
CPCY02E60/13H01G11/32H01G11/30H01G11/86
Inventor 周晓平成夏岚许丽梅马琳
Owner LINGNAN NORMAL UNIV
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