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A kind of Sn@c material preparation method of high performance potassium ion battery anode material

A battery negative electrode and potassium ion technology, which is applied in battery electrodes, electrode manufacturing, electrode heat treatment, etc., can solve the problems of complex synthesis process, difficult industrialization, and high preparation cost of Sn@C materials, and achieve excellent electrochemical performance and large ratio The effect of surface area and high specific capacity

Active Publication Date: 2020-04-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a high-performance potassium ion battery negative electrode material Sn@C material, to solve the problems of complex synthesis process, high preparation cost and difficulty in industrialization of Sn@C material in the prior art

Method used

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  • A kind of Sn@c material preparation method of high performance potassium ion battery anode material
  • A kind of Sn@c material preparation method of high performance potassium ion battery anode material
  • A kind of Sn@c material preparation method of high performance potassium ion battery anode material

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preparation example Construction

[0022] A Sn@C material preparation method of a high-performance potassium ion battery negative electrode material comprises the following steps:

[0023] Dissolve 5g of tin source in 30ml deionized water, stir evenly, fully dissolve, stir evenly, fully dissolve;

[0024] Then add 8-15g of the highly water-soluble polymer material into the above 30ml mixed solution in batches in five batches, ultrasonically and continuously stir with a glass rod, and the water-soluble polymer material will absorb the expanded mixture;

[0025] Transfer the resulting expanded mixture to a vacuum freeze-drying oven for freeze-drying for 10-15 hours to obtain a freeze-dried sample;

[0026] Transfer the freeze-dried sample to a corundum crucible, and under the protective atmosphere of nitrogen in a tube furnace, control the heating rate and sinter at a reaction temperature of 500-1200°C for 2-10 hours to obtain the sample; in the present invention, the condition of 850°C is preferred Down reactio...

Embodiment 1

[0032] Example 1: Preparation and characterization of carbon-coated single-tin materials

[0033] 5.0 g of crystallized tin tetrachloride was dissolved in an appropriate amount of deionized water, then a highly water-soluble polymer material was added to make it fully expand, and then freeze-dried. The obtained samples were ground into powders, put into corundum crucibles and transferred to a tube furnace. In an argon atmosphere, the temperature was raised to 850°C at a rate of 3°C / min, and kept at this temperature for 5 hours. After cooling, the sample was washed with deionized water, and the final sample was obtained after freeze-drying.

Embodiment 2

[0034] Example 2: Preparation and characterization of carbon-coated single-tin materials

[0035] 5.0 g of crystallized tin tetrachloride was dissolved in an appropriate amount of deionized water, then a highly water-soluble polymer material was added to make it fully expand, and then freeze-dried. The obtained samples were ground into powders, put into corundum crucibles and transferred to a tube furnace. In an argon atmosphere, the temperature was raised to 650°C at a rate of 3°C / min, and kept at this temperature for 5 hours. After cooling, the sample was washed with deionized water, and the final sample was obtained after freeze-drying.

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Abstract

The invention relates to a preparation method of a Sn@C material of a high-performance potassium ion battery negative electrode material, and belongs to the preparation method of the Sn@C material. 5gof tin sources are dissolved in 30ml of deionized water; stirring and dissolution are performed to obtain a mixed solution; then, 8 to 15g of high-degree water-soluble polymer materials are added into 30ml of mixed solution in five times in batches; ultrasound treatment is performed; a glass rod is used for continuous stirring; the water-soluble polymer material absorbs water for expansion; an expanded mixture is obtained; the expanded mixture is transferred into a vacuum freezing drying box for freezing drying; the freezing drying is performed for 10 to 15h to obtain a freezing drying sample; the sample after the vacuum freezing drying is sintered at 500 to 1200 DEG C in argon gas protection atmosphere; after heat preservation is performed for 2 to 10h, the sample is obtained; the sampleis washed by the deionized water; a carbon-encapsulated simple-substance tin material is obtained. The prepared Sn@C nanometer material has the advantages that the method is simple; the particles areuniform; the specific capacity is high; the cycle performance is good; the raw materials can be easily obtained; the material can be obtained through one-step sintering; the yield is high; the material is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing a Sn@C material, in particular to a method for preparing a Sn@C material for a negative electrode material of a high-performance potassium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, large specific energy, long cycle life, and small self-discharge, making them one of the most popular batteries for research. It has been widely used in people's daily life. At the same time, the large consumption of metallic lithium has also begun to cause people's concerns. Therefore, looking for a lithium ion substitute has become the focus of current research. Due to the advantages of abundant potassium resources, uniform distribution, and low cost, potassium-ion batteries may become a rechargeable and dischargeable battery system that can be widely used in the field of large-scale electrochemical energy storage. In particular, researchers have proved that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/38H01M4/583
CPCH01M4/0416H01M4/0471H01M4/362H01M4/387H01M4/583Y02E60/10
Inventor 鞠治成黄康生李静戚秀君吴璇庄全超史月丽
Owner CHINA UNIV OF MINING & TECH