Preparation method of carbon electrode material of porous structure sodium-ion battery

A sodium-ion battery, porous structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of difficult to guarantee the quality of electrode materials, difficult to meet, low capacity, etc. The effect of improving performance

Active Publication Date: 2017-03-22
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

Mesoporous silicon can be used as a template to prepare porous carbon, but this method is too complicated and the quality of the prepared electrode material is difficult to guarantee
In recent years, the use of biological materials to directly prepare porous carbon has emerged. The sodium electrode prepared by Jianhua Hou et al. using microalgae at 900 ° C can reach 450mAhg -1 Porous carbon materials, B.E.Conway et al. used peanut shells treated with potassium hydroxide to prepare sodium electrodes below 450mAhg at 800°C -1 The porous carbon materials prepared by using these porous carbon materials are not high enough to meet the requirements of modern electrode materials and electromotive force development.
At present, small thistle is widely distributed, except a small part is used as feed and medicinal materials, most of them are removed as weeds, which not only causes environmental pollution but also wastes resources. Therefore, it is studied to use small thistle as raw material to prepare porous carbon electrode materials It has double meanings of environmental protection and economic benefits

Method used

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  • Preparation method of carbon electrode material of porous structure sodium-ion battery
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preparation example Construction

[0026] A preparation method of a porous structure sodium ion battery carbon electrode material, comprising the following steps:

[0027] 1) washing the leaves of thistle with deionized water, freeze-drying and pulverizing to obtain pulverized dry leaves of thistle;

[0028] 2) The activator KOH, NaOH, ZnCl 2 、K 2 CO 3 or Na 2 CO 3 Put it into distilled water according to the mass ratio of (0.5-5): 1 with the crushed dry leaves of thistle, wherein, add 1-5g of dry leaves of thistle to every 50mL of distilled water, stir magnetically for 2h to form a suspension, and then put it in 120- Hydrothermal reaction at 220°C for 2-24h, after the reaction is complete, magnetically stir the obtained mixture at 60-80°C for 4-6h to obtain a slurry-like product;

[0029] 3) raising the temperature of the slurry product to 500-1100°C at a heating rate of 1-10°C / min under the protective gas nitrogen or argon and keeping it warm for 1-6h to obtain a calcined product, wherein the flow rate o...

Embodiment 1

[0033] 1) washing the leaves of thistle with deionized water, freeze-drying and pulverizing to obtain pulverized dry leaves of thistle;

[0034] 2) the activator K 2 CO 3 Put the dried leaves of thistle into distilled water according to the mass ratio of 1:1, wherein, add 1g of dried leaves of thistle to every 50mL of distilled water, stir magnetically for 2h to form a suspension, and then transfer it to a hydrothermal kettle (filling ratio 50%) hydrothermal reaction at 180°C for 12h, after the reaction was completed, the obtained mixture was magnetically stirred at 80°C for 5h to obtain a slurry-like product;

[0035] 3) Transfer the slurry-like product to an atmosphere furnace, and raise the temperature to 700° C. at a heating rate of 10° C. / min under the protection of an argon atmosphere with an air flow of 50 sccm and keep it warm for 2 hours to obtain a calcined product;

[0036] 4) Soak the calcined product in a hydrochloric acid solution with a concentration of 2 mol / ...

Embodiment 2

[0039] 1) washing the leaves of thistle with deionized water, freeze-drying and pulverizing to obtain pulverized dry leaves of thistle;

[0040]2) Put the activator NaOH and the crushed dry leaves of thistle into distilled water according to the mass ratio of 5:1, wherein, add 5g of dry leaves of thistle to every 50mL of distilled water, stir magnetically for 2h to form a suspension, and then transfer to water In a hot kettle (filling ratio is 50%), hydrothermal reaction is carried out at 120°C for 2 hours. After the reaction is completed, the obtained mixture is magnetically stirred at 60°C for 4 hours to obtain a slurry-like product;

[0041] 3) Transfer the slurry-like product to an atmosphere furnace, and raise the temperature to 1100° C. at a heating rate of 5° C. / min under the protection of a nitrogen atmosphere with an airflow of 20 sccm and keep it warm for 4 hours to obtain a calcined product;

[0042] 4) Soak the calcined product in a hydrochloric acid solution with ...

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Abstract

The invention discloses a preparation method of a carbon electrode material of a porous structure sodium-ion battery. The preparation method comprises the steps of firstly, washing leaves of cirsium segestum with deionized water, and carrying out freeze-drying and grinding to obtain ground dried leaves of cirsium segestum; secondly, placing an activator and the ground dried leaves of cirsium segestum into distilled water according to a mass ratio of (0.5 to 5):1, stirring to form mixed suspension, then performing a hydrothermal reaction, and after the reaction is ended, concentrating the obtained mixture to obtain a slurry product, wherein 1 to 5g of dried leaves of cirsium segestum is added into each 50ml of distilled water; then carrying out calcination on the slurry product in protective gas to obtain a calcined product; and finally, removing the activator in the calcined product, then washing the product with deionized water, and until filtrate is neutral, carrying out drying to obtain the carbon electrode material of the porous structure sodium-ion battery. The carbon material prepared by the preparation method disclosed by the invention has a large specific surface area and a unique three-dimensional pore structure, shows excellent electrochemical performance, and is simple in preparation process, low in cost and easy to implement industrialization.

Description

technical field [0001] The invention relates to a method for preparing a negative electrode material for a sodium ion secondary battery, in particular to a method for preparing a carbon electrode material for a sodium ion battery with a porous structure. Background technique [0002] Since the 21st century, with the depletion of non-renewable fossil fuel resources such as coal, oil, and natural gas, and the environmental pollution caused by their combustion, energy and environmental issues have become a major bottleneck affecting the sustainable development of the world today. In order to solve this world problem, it is particularly urgent to seek renewable green energy to replace traditional fossil fuels and to seek the harmonious development of people and the environment. Lithium-ion secondary batteries have the advantages of high voltage, high specific energy, long cycle life, stable discharge performance, good safety, no pollution, and wide operating temperature range. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054
CPCH01M4/583H01M10/054Y02E60/10
Inventor 曹丽云胡海玲黄剑锋许占位李嘉胤
Owner SHAANXI UNIV OF SCI & TECH
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