Preparation method and application of hollow tubular biochar

A bio-carbon, tubular technology, used in the manufacture of hybrid/electrical double-layer capacitors, electrical components, battery electrodes, etc., to achieve excellent electrochemical performance, increase specific surface area, and reduce carbonization temperature.

Inactive Publication Date: 2016-07-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on its use as lithium / sodium ion batteries, supercapacitors, adsorbents and templates after carbonization.

Method used

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  • Preparation method and application of hollow tubular biochar
  • Preparation method and application of hollow tubular biochar
  • Preparation method and application of hollow tubular biochar

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preparation example Construction

[0022] A method for preparing hollow tubular biochar, comprising the following steps:

[0023] Step 1: Soak the kapok fiber in ethanol for 6-12 hours, take it out and dry it, then soak it in water for 6-12 hours, take it out and dry it, so as to remove impurities in the kapok fiber raw material. Then, weigh 0.5-1.5g of kapok fiber and place it in the lining of a hydrothermal kettle, add 15-75mL of deionized water and stir for 30-60min, then add 5-15mL of concentrated sulfuric acid and continue stirring for 30-60min. The kapok fiber is one or more of Vietnamese kapok fiber, Indonesian kapok fiber and domestic Guangxi kapok fiber. The concentrated sulfuric acid can also be replaced by one or more of concentrated nitric acid, concentrated hydrochloric acid and phosphoric acid.

[0024] Step 2: Install the inner lining of the hydrothermal kettle equipped with the kapok fiber solution in the outer lining, fix it and place it in a homogeneous reactor, and control the filling ratio ...

Embodiment 1

[0031] Step 1: Soak the Vietnamese kapok fiber in ethanol for 6 hours, take it out and dry it, then soak it in water for 6 hours, take it out and dry it, so as to remove impurities in the raw material of the kapok fiber. Then, weigh 1 g of kapok fiber and place it in the lining of a hydrothermal kettle, add 50 mL of deionized water and stir for 30 min, then add 10 mL of concentrated sulfuric acid and continue stirring for 30 min.

[0032] Step 2: Install the inner lining of the hydrothermal kettle equipped with the kapok fiber solution in the outer lining, place it in the homogeneous reactor after fixing it, and control the filling ratio of the hydrothermal reaction to be 60%. The temperature was raised from room temperature to 180°C at a heating rate of 10°C / min, and the reaction was carried out for 24 hours.

[0033] Step 3: washing the kapok fiber after hydrothermal carbonization for 3 times with deionized water and absolute ethanol for 3 times, so as to remove impurities g...

Embodiment 2

[0038] Step 1: Soak the kapok fiber in ethanol for 8 hours, take it out and dry it, then soak it in water for 8 hours, take it out and dry it, so as to remove impurities in the kapok fiber raw material. Then, 0.5 g of kapok fiber was weighed and placed in the lining of a hydrothermal kettle, 75 mL of deionized water was added and stirred for 40 min, and then 5 mL of concentrated sulfuric acid was added to continue stirring for 40 min.

[0039] Step 2: Install the inner lining of the hydrothermal kettle equipped with the kapok fiber solution in the outer lining, place it in the homogeneous reactor after fixing it, and control the filling ratio of the hydrothermal reaction to be 80%. The temperature was raised from room temperature to 160°C at a heating rate of 5°C / min, and the reaction was carried out for 18 hours.

[0040] Step 3: washing the kapok fiber after hydrothermal carbonization twice with deionized water and with absolute ethanol twice, so as to remove impurities gene...

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Abstract

The invention discloses a preparation method and application of hollow tubular biochar. The preparation method includes: dispersing kapok fiber in a sulfuric acid solution for hydrothermal reaction to obtain carbonized kapok fiber; calcining the carbonized kapok fiber under protection of inert gas, cooling, washing, collecting and drying the calcined kapok fiber to obtain the hollow tubular biochar. The preparation method is simple and easy to control, carbonization and activation of the kapok fiber can be well realized on the premise that original structure of the kapok fiber is maintained, and distribution of balls in the inner surface and the outer surface of a hollow tube can be realized by controlling hydrothermal temperature and calcining temperature. In addition, the biochar prepared by the method can be applied in lithium/sodium ion batteries and supercapacitors and can be used as a carbon matrix in adsorbents, template agents and composite materials. Especially, the hollow tubular biochar presents excellent electrochemical performance when being applied in the lithium/sodium ion batteries.

Description

【Technical field】 [0001] The invention belongs to the technical field of preparation of three-dimensional carbon materials, and in particular relates to a preparation method and application of hollow tubular biochar. 【Background technique】 [0002] Due to the advantages of high working voltage, high capacity, small self-discharge and long cycle life, lithium-ion batteries are widely used in the portable electronics market, and have become the primary choice for power sources for electric vehicles and large-scale energy storage systems. However, as With the real arrival of the era of electric vehicles and smart grids, global lithium resources will not be able to effectively meet the huge demand for power lithium-ion batteries [Tarascon JM, Armand M. Issues and challenges facing rechargeable lithium batteries [J]. Nature, 2001, 414(6861): 359-367]. Sodium-ion batteries have the characteristics of abundant resources, low cost, and environmental friendliness, and are considered ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/583H01M4/133H01M4/1393H01G11/40H01G11/86
CPCH01G11/40H01G11/86H01M4/133H01M4/1393H01M4/583Y02E60/10Y02E60/13
Inventor 黄剑锋李文斌任一杰李瑞梓费杰曹丽云王海静罗晓敏井宣人闻稼宝
Owner SHAANXI UNIV OF SCI & TECH
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