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Preparation method and application of carbon-coated tin selenide negative electrode material

A technology of negative electrode material and carbon package, which is applied in the field of preparation of carbon-coated tin selenide negative electrode material, can solve the problems of SnSe negative electrode material such as poor conductivity, poor cycle stability, and poor rate performance, and achieve good electrochemical performance and easy operation , the effect of simple process

Pending Publication Date: 2020-08-25
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor conductivity of SnSe negative electrode material and serious volume expansion of the material during the electrochemical cycle process, resulting in poor rate performance and poor cycle stability, and to provide a carbon-coated tin selenide negative electrode material The preparation method and its application

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  • Preparation method and application of carbon-coated tin selenide negative electrode material
  • Preparation method and application of carbon-coated tin selenide negative electrode material
  • Preparation method and application of carbon-coated tin selenide negative electrode material

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specific Embodiment approach 1

[0027] Specific embodiment one: what this embodiment records is a kind of preparation method of carbon-coated tin selenide negative electrode material, and the specific steps of described method are as follows:

[0028] Step 1: Mix Sn powder and Se powder in a molar ratio of 1:1, transfer them into a vacuum quartz tube, and use a tube furnace for high-temperature calcination;

[0029] Step 2: Grinding and sieving the SnSe powder obtained by calcining, and mixing the sieved product with a carbon source;

[0030] Step 3: Perform high-energy ball milling treatment under an inert atmosphere, and sieve to obtain the product;

[0031] Step 4: annealing to form a SnSe powder whose surface is covered with a compact and uniform carbon layer.

specific Embodiment approach 2

[0032] Embodiment 2: In the method for preparing a carbon-coated tin selenide negative electrode material described in Embodiment 1, in step 1, the temperature of the high-temperature calcination is 590° C., the time is 72 hours, and the degree of vacuum is ≤200 Pa.

specific Embodiment approach 3

[0033] Embodiment 3: In the method for preparing a carbon-coated tin selenide negative electrode material described in Embodiment 1, in step 2, the mass ratio of the carbon source to the total mixture is 10wt.%-40wt.%.

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Abstract

The invention discloses a preparation method and application of a carbon-coated tin selenide negative electrode material, and belongs to the technical field of sodium ion batteries. The SnSe semiconductor material synthesized by calcining is coated with a compact and uniform carbon layer on the surface by adopting a high-energy ball milling and annealing treatment method, so that the electrochemical properties such as reversible specific capacity and cycle performance are greatly improved. Through a high-energy ball milling method, while the particle size of SnSe material particles is reduced,a uniform carbon source is introduced to the surface of the material, and a product can be obtained through annealing treatment. The preparation method disclosed by the invention is easy to operate,simple in process and low in cost, so that the invention has a wide application prospect. The prepared composite material has good electrochemical properties, including relatively high reversible specific capacity, good cycle performance and the like.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a preparation method and application of a carbon-coated tin selenide negative electrode material. Background technique [0002] In the current advanced mobile devices such as mobile phones, notebook computers or pure electric vehicles, lithium-ion batteries are the most frequently used electrochemical secondary batteries. Lithium-ion batteries have high rated voltage, high energy density, good cycle performance, and safety. Good performance, wide operating temperature range, low pollution, no obvious self-discharge phenomenon, and no memory effect. Therefore, lithium-ion batteries have become the preferred energy storage batteries at present. However, considering the high cost of lithium salt resources required for the cathode materials of lithium-ion batteries, and the current consumption level is only enough to support human use for 30 years, the sustai...

Claims

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Application Information

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IPC IPC(8): C01B19/04C01B32/05H01M4/36H01M4/58H01M4/62H01M10/054
CPCC01B19/007C01B32/05H01M4/366H01M4/581H01M4/625H01M4/628H01M10/054C01P2004/03C01P2002/82Y02E60/10
Inventor 高云智徐进李兵
Owner HARBIN INST OF TECH
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