A nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and its preparation method

A double-doped, hollow bowl technology, applied in carbon preparation/purification, structural parts, battery electrodes, etc., can solve the problems of low volumetric energy density of batteries and low tap density of powders

Active Publication Date: 2021-02-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The space inside the particles can significantly alleviate the stress concentration caused by the intercalation / deintercalation of ions, but simple hollow structure materials, such as hollow spheres, often have low powder tap density due to the excessively large cavity space inside. Defects that lead to low volumetric energy density of batteries

Method used

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  • A nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and its preparation method
  • A nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and its preparation method
  • A nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A mixture containing 3 g of fructose and xylose (1:1) was added to 25 ml of deionized water, 9 ml of sodium oleate solution (10 mmol / L) and 9 ml of P123 solution (1 mmol / L) and stirred until Mix well, put the mixed transparent liquid into an 80ml polytetrafluoroethylene-lined stainless steel water heating tank, tighten the lid, put the water heating tank in an oven at 160°C, keep it warm for 15 hours, then take out the water heating tank Oven, placed in the air to cool to room temperature, then open the water-heated jar, pour out the mixture inside, centrifuge in a centrifuge at 8000 rpm to obtain a precipitate, and then repeatedly wash with water and ethanol to obtain a hollow carbon bowl. Disperse 1 gram of hollow bowl-shaped carbon in 20 milliliters of potassium hydroxide solution (1mol / L), and ultrasonically mix, stir for 12 hours, centrifuge in a centrifuge at 8000 rpm, and then wash repeatedly with water and ethanol, The precipitate was obtained and dried at 70°C ...

Embodiment 2

[0024] Will contain the juice of three kinds of fruits apple, grape, sugar cane of 3 grams to add 20 milliliters of deionized aqueous solution, the sodium stearate solution (10mmol / L) of 8 milliliters and the F127 solution (1mmol / L) of 8 milliliters mix, and stir until Mix evenly, put the mixed transparent liquid into a 50ml polytetrafluoroethylene-lined stainless steel water heating tank, tighten the lid, put the water heating tank in an oven at 150°C, keep it warm for 20 hours, then take it out Oven, placed in the air to cool to room temperature, then open the water-heated jar, pour out the mixture inside, centrifuge in a centrifuge at 8000 rpm to obtain a precipitate, and then repeatedly wash with water and ethanol to obtain a hollow carbon bowl. Disperse 2 grams of hollow bowl-shaped carbon in 20 milliliters of sodium hydroxide solution (2 mol / L), and ultrasonically mix, stir for 8 hours, centrifuge in a centrifuge at 8000 rpm, then wash repeatedly with water and ethanol, ...

Embodiment 3

[0026] Add 40 milliliters of deionized aqueous solution containing 3 grams of potato juice, 10 milliliters of N-oleoyl N-methyl taurine sodium solution (10mmol / L) and 10 milliliters of P123 solution (1mmol / L) mix, and stir until Mix evenly, put the mixed transparent liquid into a 100ml polytetrafluoroethylene-lined stainless steel water heating tank, tighten the lid, put the water heating tank in an oven at 170°C, keep it warm for 8 hours, then take out the water heating tank Oven, placed in the air to cool to room temperature, then open the water-heated jar, pour out the mixture inside, centrifuge in a centrifuge at 8000 rpm to obtain a precipitate, and then repeatedly wash with water and ethanol to obtain a hollow carbon bowl. Disperse 1 gram of hollow bowl-shaped carbon in 20 milliliters of zinc chloride solution (1mol / L), and ultrasonically mix, stir for 6 hours, centrifuge in a centrifuge at 8000 rpm, then wash repeatedly with water and ethanol, The precipitate was obtain...

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Abstract

The invention belongs to the technical field of inorganic material preparation and battery materials, and relates to a carbon-oxygen double-doped porous hollow bowl-shaped carbon material and a preparation method thereof. The material is a carbonaceous bowl-shaped structure particle with high dispersibility and narrow particle size distribution , the particle size is controllable, there is a hollow structure inside the particle, the shape is a concave bowl, the wall thickness is controllable, there are many holes on the wall of the bowl, the holes include micropores and mesopores, and the specific surface area is high; it has nitrogen and oxygen double doping characteristics. Potassium ion battery anode for high volume specific capacity and cycle stability. Potassium-ion batteries are considered to be one of the candidates to replace traditional high-priced lithium-ion batteries due to their abundant global reserves of potassium and low redox voltage values. However, the large size of potassium ions results in a lack of specific capacity for potassium-ion batteries. High electrode material with good cycle stability and rate performance. The material of the invention is used for the electrode of the potassium ion battery, and achieves the purpose of enhancing the stability of the potassium ion battery, improving the rate performance, and simultaneously improving the volume specific capacity of the battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials and battery materials, and in particular relates to a nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and a preparation method thereof, which are used for a negative electrode of a potassium-ion battery with high volume specific capacity and cycle stability. Background technique [0002] In recent years, due to the scarcity of lithium resources and rising costs, there has been an increasing demand for new energy storage technologies in the fields of vehicles, electronic equipment, especially large-scale fixed storage systems, with the goal of replacing traditional high-priced lithium-ion batteries. Among them, potassium-ion batteries are considered as one of the candidates. Potassium is not only abundant in global reserves, but also its redox voltage value is lower than that of another cheap metal—sodium, which is comparable to that of lithium (the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02H01M4/583
CPCC01B32/05H01M4/583Y02E60/10
Inventor 贾宝瑞张自利秦明礼曲选辉王永刘鸾赵勇智吴昊阳鲁慧峰
Owner UNIV OF SCI & TECH BEIJING
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