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Preparation method of porous biomass carbon, porous biomass carbon and application

A technology of biomass carbon and products, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of poor charge and discharge capacity and cycle stability of lithium-ion batteries, achieve resource reuse, prevent oxidation, and reduce prices cheap effect

Active Publication Date: 2018-05-15
JILIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the activated carbon obtained by the existing preparation method is used as the negative electrode material of the lithium-ion battery, the charge-discharge capacity and cycle stability of the lithium-ion battery are poor.

Method used

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  • Preparation method of porous biomass carbon, porous biomass carbon and application
  • Preparation method of porous biomass carbon, porous biomass carbon and application
  • Preparation method of porous biomass carbon, porous biomass carbon and application

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preparation example Construction

[0036] The preparation method of the porous biomass carbon of one embodiment, comprises the following steps:

[0037] Step S110, mixing the straw with the calcium chloride solution and then standing still for 12-24 hours to obtain a mixture, wherein the mass ratio of the straw to the calcium chloride in the calcium chloride solution is 1:1.5-1:3.

[0038] In one embodiment, the stalks are corn stalks. Of course, in other embodiments, the straw can also be the remaining part of wheat, rice, potatoes, rapeseed, cotton, sugar cane or other coarse grain crops after the seeds are harvested.

[0039] In one embodiment, the straw is crushed, and the crushed straw is mixed with a calcium chloride solution.

[0040] In one of the embodiments, the straw is in powder form. Preferably, the particle size of the straw powder is 800-900 microns, preferably 850 microns.

[0041] In one embodiment, the concentration of the calcium chloride solution is 2mol / L˜4mol / L, preferably 3mol / L.

[0...

Embodiment 1

[0087] The preparation of porous biomass carbon includes the following steps:

[0088] Crush corn stalks into powder, mix 20 grams of corn stalk powder with 200 ml of 3mol / L calcium chloride solution, and let stand at room temperature for 24 hours;

[0089] Dry the mixture in an oven at a constant temperature of 60°C and place it in a crucible with a lid, heat it to 300°C in a muffle furnace at a heating rate of 10°C / min, and perform low-temperature carbonization for 3 hours to obtain a low-temperature carbide;

[0090] Continue heating the low-temperature carbide to 600°C in a muffle furnace at a heating rate of 10°C / min for high-temperature activation for 2 hours, and cool naturally to room temperature to obtain a pre-product. Put the pre-product into a beaker and add 100mL of deionized water to wash to obtain the recovered calcium chloride solution;

[0091] Soak the pre-product in 100mL 2mol / L hydrochloric acid solution for 24 hours, then wash it with 70°C deionized water...

Embodiment 2

[0093] The preparation of porous biomass carbon includes the following steps:

[0094] Crush corn stalks into powder, mix 10 grams of corn stalk powder with 200 ml of 2mol / L calcium chloride solution, and let stand at room temperature for 24 hours;

[0095] Dry the mixture in an oven at a constant temperature of 60°C and place it in a crucible with a lid, heat it to 300°C in a muffle furnace at a heating rate of 9°C / min, and perform low-temperature carbonization for 3 hours to obtain a low-temperature carbide;

[0096] Continue heating the low-temperature carbide to 500°C in a muffle furnace at a heating rate of 9°C / min for high-temperature activation for 1 hour, and naturally cool to room temperature to obtain a pre-product. Put the pre-product into a beaker and add 100mL of deionized water to wash to obtain the recovered calcium chloride solution;

[0097] Soak the pre-product in 100mL of 4mol / L hydrochloric acid solution for 24 hours, then wash it with 80°C deionized water...

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Abstract

The invention relates to a preparation method of porous biomass carbon, porous biomass carbon and application. The preparation method of the porous biomass carbon comprises the following steps: mixingstraw with a calcium chloride solution, and leaving to stand for 12-24 hours so as to obtain a mixture, wherein the mass ratio of the straw to calcium chloride in the calcium chloride solution is (1:1.5)-(1:3); drying the mixture, and performing low-temperature carbonization for 2-3 hours at 300-350 DEG C so as to obtain a low-temperature carbide; heating the low-temperature carbide to 500-700 DEG C, and performing high-temperature activation treatment for 1-3 hours so as to obtain a pre-product; soaking the pre-product into an inorganic strong acid for 12-24 hours, and further washing with water of 70-80 DEG C till being neutral, thereby obtaining the porous biomass carbon. By adopting the porous biomass carbon prepared by using the preparation method of the porous biomass carbon, the charge / discharge specific capacity of a lithium ion battery is increased, and the circulation stability of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to a preparation method of porous biomass carbon, porous biomass carbon and its application. Background technique [0002] With the rapid development of social economy and population growth, people's demand for energy is increasing. However, due to the non-renewability of fossil energy such as oil, coal, and natural gas, and after a long period of mining, it gradually cannot meet the needs of economic and social development. need. In addition, the large amount of greenhouse gases and toxic gases produced by the combustion of fossil energy are also endangering our living environment. In recent years, with the improvement of people's awareness of environmental protection, people's voice for clean energy is getting higher and higher. The development of clean, efficient and energy-saving new energy to replace fossil energy has become a hot spot for researchers. [0003] Lithium-ion, as a clean and efficient green power source, has r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324H01M4/62
CPCH01M4/625Y02E60/10
Inventor 李义李纯于开锋曹兴刚王中书邹康迪
Owner JILIN UNIV
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