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A preparation method and application of tubular biochar-coated sno2 structure composite powder

A composite powder and bio-carbon technology, applied in structural parts, electrochemical generators, electrical components, etc., can solve the problems of low coulombic efficiency of materials, large irreversible capacity, electrode volume changes, etc., and achieve uniform shape and particle size Uniform, high-purity effect

Active Publication Date: 2019-02-26
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 some problems with tin oxide-based anode materials, (I) in Na + There is a huge volume change in the electrode during the deintercalation process; (II) tin oxide is used as the negative electrode material of sodium ion battery, and Na + The first step of the electrochemical reaction is irreversible, resulting in a relatively large irreversible capacity, which makes the coulombic efficiency of this type of material low, which greatly affects the practical application of this type of material.

Method used

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  • A preparation method and application of tubular biochar-coated sno2 structure composite powder
  • A preparation method and application of tubular biochar-coated sno2 structure composite powder
  • A preparation method and application of tubular biochar-coated sno2 structure composite powder

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preparation example Construction

[0030] A tubular biochar-coated SnO of the present invention 2 The preparation method of structure, comprises the following steps:

[0031] (1) Deseeding, washing and drying the collected fluff plants to obtain product A;

[0032] (2) Put the product A in a white porcelain boat, put it in a tube furnace for calcination, the calcination temperature is 400-1200°C, and the heating rate is 1-10°C·min -1 , the holding time is 1 to 5 hours, the atmosphere is argon protection, and the air flow rate is 0.1 to 1 sccm to obtain the product B;

[0033] (3) KOH, K 2 CO 3 、KHCO 3 Mix evenly with a mass ratio of 1:(1-2.5):(0.1-0.5) to obtain product C;

[0034] (4) Mix product B and product C uniformly at a mass ratio of 1: (0.5 to 3.5) to obtain product D;

[0035] (5) Add SnCl to substance D 2 solution, stirred evenly to obtain solution E, wherein, substance D and SnCl 2 The mass ratio of (1-5): 1; SnCl 2 The solution concentration is 0.5-3.5mol / L. Put it into a magnetic stirrer...

Embodiment 1

[0040] (1) Deseeding, washing and drying the collected fluff plants to obtain substance A;

[0041] (2) Put substance A in a white porcelain boat, put it in a tube furnace for calcination, the calcination temperature is 1000°C, and the heating rate is 5°C·min -1 , the holding time is 3h, the atmosphere is protected by argon, and the air flow rate is 0.5sccm, and the substance B is obtained;

[0042] (3) KOH, K 2 CO 3 、KHCO 3 Mix evenly with a mass ratio of 1:1:0.5 to obtain substance C;

[0043] (4) Mix substance B and substance C uniformly at a mass ratio of 1:1 to obtain substance D;

[0044] (5) Add SnCl to substance D 2 2H 2 0 and 50mL water, substance D and stannous chloride were added with a mass ratio of 1:1, put into a magnetic stirrer and stirred for 30min, to obtain solution E;

[0045] (6) Pour the solution E into the container, and then put the container into the microwave-ultraviolet-ultrasonic trinity synthesis extraction reaction apparatus, adopt the micr...

Embodiment 2

[0048] (1) Deseeding, washing and drying the collected fluff plants to obtain substance A;

[0049] (2) Put substance A in a white porcelain boat, put it in a tube furnace for calcination, the calcination temperature is 1000°C, and the heating rate is 5°C·min -1 , the holding time is 3h, the atmosphere is protected by argon, and the air flow rate is 0.5sccm, and the substance B is obtained;

[0050] (3) KOH, K 2 CO 3 、KHCO 3 Mix evenly with a mass ratio of 1:1:0.5 to obtain substance C;

[0051] (4) Mix substance B and substance C uniformly at a mass ratio of 1:1 to obtain substance D;

[0052] (5) Add SnCl to substance D 2 2H 2 0 and 50mL water, substance D and tin protochloride were added into a magnetic stirrer with a mass ratio of 2:1 and stirred for 30min to obtain solution E;

[0053] (6) Pour the solution E into the container, and then put the container into the microwave-ultraviolet-ultrasonic trinity synthesis extraction reaction apparatus, adopt the microwave-...

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Abstract

The invention relates to a preparation method of compound powder with a tubular biochar-coated SnO<2> structure and an application of the compound powder. According to the preparation method, villus plants such as dandelion are subjected to earlier-stage alkali activation treatment at an earlier stage, so that a large quantity of oxygen-containing functional groups similar to hydroxyl and carboxyl exist inside a carbon tube. A microwave-ultraviolet-ultrasound synthetic mode is adopted, so that the adsorption of SnO<2> particles by a carbon framework can be facilitated; the problem of volume expansion of the SnO<2> in charging and discharging processes is effectively solved; and the tubular biochar-coated SnO<2> structure is obtained finally. The preparation method is simple, low in reaction temperature, short in reaction period, simple in process equipment, environmentally friendly and suitable for large-scale production, and does not need subsequent treatment.

Description

【Technical field】 [0001] The present invention relates to a kind of SnO 2 / The preparation method of biological carbon composite material, be specifically related to a kind of tubular biological carbon coated SnO 2 Preparation method and application of structural composite powder. 【Background technique】 [0002] With the development of science and technology and the advent of the information society, the requirements for chemical power sources are gradually increasing. Lithium-ion batteries have the characteristics of high voltage and high specific energy, so they have made great progress in portable power applications. However, lithium is expensive and has a small content in the earth's crust. As it is gradually used in electric vehicles, the demand for lithium will increase greatly. However, lithium reserves are limited and the storage distribution is uneven, which will restrict the large-scale development of long-life energy storage batteries [Liu Chunna. Research progr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/054
CPCH01M4/362H01M4/483H01M4/62H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 吴建鹏王彩薇许占位孔硌程娅伊赵肖肖罗晓敏朱东岳朱锋张欣欣
Owner SHAANXI UNIV OF SCI & TECH
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