Method for using biomass porous carbon as potassium ion battery cathode

A battery anode and potassium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficulty in controlling the synthesis morphology, restricting the application of potassium ion battery anode materials, etc., and achieve easy expansion of production and excellent cycle stability. , the effect of excellent electrochemical performance

Active Publication Date: 2019-05-10
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Potassium ion carbon anode materials are prepared from traditional biomass raw materials, the synthesis morphology is difficult to control, and strong acids and alkalis are often used in the synthesis process
However, so far, the preparation method of biomass three-dimensional hierarchical porous carbon materials with controllable and regular microstructure has not been reported, which greatly restricts the further application of anode materials for potassium-ion batteries.

Method used

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  • Method for using biomass porous carbon as potassium ion battery cathode
  • Method for using biomass porous carbon as potassium ion battery cathode
  • Method for using biomass porous carbon as potassium ion battery cathode

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1: Preparation and structural characterization of biomass three-dimensional hierarchical porous carbon materials

[0036] (1) The processing of biomass raw materials: the blue-green algae is processed into a powder with a particle size of 400 meshes to obtain the blue-green algae powder;

[0037] (2) Mixing and grinding: ball mill 8g of cyanobacteria powder with 16g of specific salt (ingredients: 8g of sodium chloride, 8g of potassium chloride) particles at a speed of 450 rpm for 4 hours to obtain a precursor;

[0038] (3) Carbonization: put the precursor obtained in step (2) in a corundum crucible, and cover it with 10g of specific salt (ingredients: 5g of sodium chloride, 5g of potassium chloride); place the crucible in a muffle furnace, Under the condition of no gas protection, the temperature was raised to 800°C at a rate of 5°C / min for 3 hours, and the carbonized product was obtained by cooling to room temperature with the furnace.

[0039] (4) Impurity re...

Embodiment 2

[0045] (1) Treatment of biomass raw materials: wash and dry the tea leaves, and pulverize them into powders with a particle size of 400 mesh to obtain tea powder.

[0046] (2) Mixing and grinding: 8 g of cyanobacteria powder and 16 g of mixed salt (8 g of sodium chloride, 8 g of potassium chloride) particles were ball milled at a speed of 450 rpm for 4 hours to obtain a precursor.

[0047] (3) Carbonization: the precursor obtained in step (2) is placed in a corundum crucible, and 10g of mixed salt (sodium chloride 5g, potassium chloride 5g) is covered on it, and the crucible is placed in a muffle furnace. Under the condition of gas protection, the temperature was raised to 800°C at a rate of 5°C / min and kept for 3 hours, and then cooled to room temperature with the furnace to obtain a carbonized product.

[0048] (4) Impurity removal: After the carbonized product is washed and filtered once with dilute hydrochloric acid, it is washed repeatedly with deionized water, filtered w...

Embodiment 3

[0051] (1) Treatment of biomass raw materials: wash and dry the peanut shells, and crush them into peanut shell powder with a particle size of 800 mesh.

[0052] (2) Mixed grinding: 8 g of peanut shell powder and 16 g of mixed salt (8 g of sodium chloride, 8 g of potassium chloride) particles were ball milled at a speed of 450 rpm for 4 hours to obtain a precursor.

[0053] (3) Carbonization: the precursor obtained in step (2) is placed in a corundum crucible, and 10g of mixed salt (sodium chloride 5g, potassium chloride 5g) is covered on it, and the crucible is placed in a muffle furnace. Under the condition of gas protection, the temperature was raised to 800°C at a rate of 5°C / min and kept for 3 hours, and then cooled to room temperature with the furnace to obtain a carbonized product.

[0054] (4) Impurity removal: After the carbonized product is washed and filtered once with dilute hydrochloric acid, it is washed repeatedly with deionized water, filtered with a Buchner fu...

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Abstract

The invention discloses a method for using biomass porous carbon as a potassium ion battery cathode. Firstly, a biomass precursor is evenly mixed with specific salt, a pollution-free molten salt carbonization method is adopted to prepare a three-dimensional classification porous carbon material, a carbonization temperature and a ratio of the specific salt to a biomass raw material in a reaction process are regulated and controlled to obtain the porous carbon material, and the porous carbon material is used as the potassium ion battery cathode. The porous carbon cathode material is prepared bya molten salt carbonization method which comprises the following steps that: 1) cleaning and smashing the biomass raw material into precursor powder; 2) carrying out ball milling and mixing on the precursor and the specific salt particles; and 3) after a product in 2) is coated with salt powder, rising the temperature to 500-1200DEG C at a rate of 1-10DEG C / min under air, keeping the temperature for 3-6h, and washing, separating and purifying the generated product to obtain a target product. The synthesis method is simple and is free from pollution, operation steps can be easily controlled, scale production is realized, and realizability is high. The obtained porous carbon material is used as the potassium ion battery cathode and has excellent electrochemical performance and good cycling stability.

Description

technical field [0001] The invention relates to the technical field of potassium ion energy storage equipment, in particular to a method for preparing porous carbon from biomass to be used as a negative electrode of a potassium ion battery. Background technique [0002] As the main energy source in today's society, fossil fuel energy is non-renewable, and the gas emissions after combustion can also cause serious environmental problems, such as global warming and thermal pollution. Sustainable and green wind and solar energy can be converted into electricity and transmitted to cities, but only after being stored in rechargeable batteries can it be widely used. Considering the shortage of lithium resources and the uneven geographical distribution leading to price increases, it is generally believed that lithium-ion batteries are difficult to apply to large-scale energy storage devices. As price is the main issue for stationary batteries, lithium-ion will continue to be used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/054
CPCY02E60/10
Inventor 鞠治成孙永文张雅庄全超史月丽崔永丽
Owner CHINA UNIV OF MINING & TECH
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