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Vinasse porous carbon/cobalt-nickel hydroxide electrode material and preparation process thereof

A technology of cobalt-nickel hydroxide and electrode materials, which is applied in the manufacture of hybrid/electric double-layer capacitors and electrodes of hybrid capacitors, can solve the problems of poor conductivity, poor conductivity, and expensive graphene, and achieve good rate performance, The effect of high specific capacity

Active Publication Date: 2021-01-29
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method has the following technical problems: (1) graphene itself is very easy to agglomerate and is not easy to disperse into a uniform solution; (2) graphene is expensive, and the preparation process of graphene is complicated and will produce substances harmful to the environment
However, this method still has the following technical problems: (1) The pure metal compound electrode material itself has poor conductivity; (2) The pure metal compound electrode material has poor stability, which is easy to cause damage during high-current charge-discharge and cycle processes. The structure itself collapses, causing agglomeration between materials, resulting in a rapid decline in the performance of the material
[0005] Therefore, based on the above reasons, a cheap porous carbon material is designed, and a transition metal compound material is combined with a porous carbon material to solve the problems of poor conductivity and poor stability of pure metal compound electrode materials, and has high capacitance performance.

Method used

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  • Vinasse porous carbon/cobalt-nickel hydroxide electrode material and preparation process thereof
  • Vinasse porous carbon/cobalt-nickel hydroxide electrode material and preparation process thereof
  • Vinasse porous carbon/cobalt-nickel hydroxide electrode material and preparation process thereof

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Embodiment 1

[0035] Material product preparation:

[0036] (1) Preparation of distiller's grain porous carbon: After drying, grinding and crushing distiller's grains, pre-carbonize to obtain a carbon precursor. The pre-carbonization temperature is 500°C, and the pre-carbonization time is 2h. Mix and grind at a ratio of 1:4, and calcinate the ground powder at a temperature of 700°C for 2 hours, then wash, filter, dry, and grind to obtain distiller’s grain porous carbon.

[0037] (2) Distiller's grain porous carbon / cobalt-nickel hydroxide electrode material: First, weigh 0.03 g of the prepared distiller's grain porous carbon into a beaker, then weigh 0.4 g of cobalt nitrate hexahydrate, 0.8 g of nickel nitrate hexahydrate, and 0.5 g of urea. g, polyvinylpyrrolidone 0.1g, respectively added to a beaker, then poured into 50ml of deionized water, ultrasonically stirred at room temperature until completely dissolved and mixed evenly, then transferred to a reaction kettle, and carried out hydroth...

Embodiment 2

[0045] Comparative analysis of electrochemical properties of distiller's grain porous carbon / cobalt-nickel hydroxide composites under different cobalt-nickel mass ratios (the mass ratio of distiller's grain porous carbon to cobalt nitrate hexahydrate, nickel nitrate hexahydrate, urea and polyvinylpyrrolidone is 0.3: 4:4:5:1)

[0046] The steps not specified in the specific steps are the same as the preparation method of Example 1, the difference is that the quality of the specific distiller's grain porous carbon is 0.03g, the quality of cobalt nitrate hexahydrate is 0.4g, and the quality of nickel nitrate hexahydrate is 0.4g. The quality that takes is 0.4g, urea 0.5g, polyvinylpyrrolidone 0.1g, carries out electrochemical test to the composite material prepared in embodiment 2, and test method is identical with embodiment 1, and test result is as follows Figure 7 , Figure 8 As shown, there is still an obvious redox peak at 20mV s-1, which proves its good rate performance, b...

Embodiment 3

[0048] Comparative analysis of electrochemical properties of distiller's grain porous carbon / cobalt-nickel hydroxide composites under different cobalt-nickel mass ratios (the mass ratio of distiller's grain porous carbon to cobalt nitrate hexahydrate, nickel nitrate hexahydrate, urea and polyvinylpyrrolidone is 0.3: 4:12:5:1)

[0049] The steps not specified in the specific steps are the same as the preparation method of Example 1, the difference is that the quality of the specific distiller's grain porous carbon is 0.03g, the quality of cobalt nitrate hexahydrate is 0.4g, and the quality of nickel nitrate hexahydrate is 0.4g. The quality that takes is 1.2g, urea 0.5g, polyvinylpyrrolidone 0.1g, carries out electrochemical test to the composite material prepared in embodiment 3, and test method is identical with embodiment 1, and test result is as follows Figure 9 , Figure 10 As shown, it can be seen from the figure that there are still obvious redox peaks, and its specific...

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Abstract

The invention provides a vinasse porous carbon / cobalt-nickel hydroxide electrode material and a preparation process thereof. The material is a vinasse porous carbon / cobalt-nickel hydroxide electrode material obtained by taking vinasse porous carbon as a substrate and loading cobalt and nickel elements on the surface of the vinasse porous carbon in a CoNiLDH form. The process comprises the following steps: carbonizing vinasse to obtain vinasse porous carbon, carrying out hydrothermal reaction on the vinasse porous carbon, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, urea and polyvinylpyrrolidone, and finally, carrying out suction filtration, washing and drying to obtain the product. The prepared composite material is good in stability, high in compounding degree and high in specific capacity and rate capability, meanwhile, the substrate carbon material is from vinasse, the raw materials are wide in source and low in price, and the vinasse is turned into wealth.

Description

technical field [0001] The invention relates to a distiller's grain porous carbon / cobalt-nickel hydroxide composite electrode material and a preparation process thereof, belonging to the technical field of supercapacitor materials. Background technique [0002] With the rapid development of society and technology, the widespread popularization of new energy vehicles and various electronic smart products, people's demand for energy storage devices continues to surge, and the solution to energy storage / conversion and its impact on the environment has become the most popular in recent years. topic of. In this regard, new and sustainable energy storage / conversion technologies are required to meet the rapidly growing global energy demand. Supercapacitors have emerged as the times require. They have the advantages of high power density, long cycle life, fast charge and discharge, and low maintenance costs. They are considered to be a promising energy conversion device. However, ...

Claims

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Application Information

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IPC IPC(8): H01G11/26H01G11/30H01G11/32H01G11/44H01G11/86
CPCH01G11/26H01G11/30H01G11/32H01G11/44H01G11/86Y02E60/13
Inventor 彭洪亮胡芳杨永健杨松涛么蕾徐芬孙立贤
Owner GUILIN UNIV OF ELECTRONIC TECH
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