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Nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and preparation method thereof

A double doping and hollow bowl technology, which is applied in the preparation/purification of carbon, electrical components, battery electrodes, etc., can solve the problems of low volumetric energy density of batteries and low tap density of powders

Active Publication Date: 2019-09-20
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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  • Nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and preparation method thereof
  • Nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and preparation method thereof
  • Nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and preparation method thereof

Examples

Experimental program
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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 carbon bowl-shaped structure particles, which are high in dispersity, narrow in particle size distribution and controllable in particle size; a hollow structure exists in the particles, the appearance is in a concave bowl shape, and the wall thickness is controllable; a plurality of holes are formed in the bowl wall and comprise micropores and mesopores, so that the specific surface area is high. The material has the characteristic of double doping of nitrogen and oxygen elements, and can be used for a potassium ion battery negative electrode with high volume specific capacity and cycling stability. Due to the characteristics of rich potassium global reserve and low oxidation-reduction voltage value, the potassium ion battery is considered to be one of traditional high-price lithium ion battery candidates; however, the size of potassium ions is large, so that the potassium ion battery electrode material with high specific capacity and good cycling stability and rate capability is lacked in the prior art. The material is used for potassium ion battery electrodes, and the purposes of enhancing the stability of the potassium ion battery, improving the rate capability and improving the volume specific capacity of the battery are achieved.

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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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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