A kind of negative electrode material of lithium ion battery and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in the field of material chemistry, can solve the problems of small reversible capacity and poor cycle performance, and achieve the effect of improving electrochemical performance, good cycle life, and high conductivity

Active Publication Date: 2020-12-11
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of small reversible capacity and poor cycle performance in the current graphite negative electrode materials, the present invention provides a lithium ion battery negative electrode material and a preparation method thereof

Method used

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  • A kind of negative electrode material of lithium ion battery and preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of ZnS hollow nanospheres:

[0025] Dissolve 0.8g of zinc chloride and 1.5g of thiourea in 80mL of distilled water (solution A), weigh another 0.8g of gelatin into 80mL of distilled water, heat and stir in a water bath until the gelatin dissolves (solution B). The two solutions were mixed, stirred for 20 min, and transferred to a Teflon-lined autoclave. The reactor was heated to 100-150°C and kept for 12 hours. After naturally cooling to room temperature, the product was collected by centrifugation, washed three times with distilled water and absolute ethanol, and dried in an oven at 60°C.

[0026] (2) Preparation of zinc selenide-zinc sulfide composite materials:

[0027] The zinc sulfide hollow nanospheres and selenium powder prepared in step (1) were mixed and ground evenly at a mass ratio of 15:1, placed in a tube furnace, heated to 500°C under an argon atmosphere, kept for 4 hours, and then heated in the furnace Cool to room temperature.

[0028...

Embodiment 2

[0031] (1) Preparation of ZnS hollow nanospheres:

[0032] Dissolve 0.5g of zinc chloride and 1g of thiourea in 50mL of distilled water (solution A), weigh another 0.5g of gelatin into 50mL of distilled water, heat and stir in a water bath at 60°C until the gelatin dissolves (solution B). The two solutions were mixed, stirred for 10 min, and transferred to a Teflon-lined autoclave. The autoclave was heated to 100°C and held for 12 hours. After naturally cooling to room temperature, the product was collected by centrifugation, washed three times with distilled water and absolute ethanol, and dried in an oven at 60°C.

[0033] (2) Preparation of zinc selenide-zinc sulfide composite materials:

[0034] The zinc sulfide hollow nanospheres and selenium powder prepared in step (1) were mixed and ground evenly according to the mass ratio of 20:1, placed in a tube furnace, heated to 400°C under an argon atmosphere, kept for 3 hours, and then heated in the furnace Cool to room tempe...

Embodiment 3

[0036] (1) Preparation of zinc sulfide hollow nanospheres:

[0037] Dissolve 1g of zinc chloride and 2g of thiourea in 100mL of distilled water (solution A), add 1g of gelatin into 100mL of distilled water, heat and stir in a water bath at 80°C until the gelatin dissolves (solution B). The two solutions were mixed, stirred for 30 min, and transferred to a Teflon-lined autoclave. The autoclave was heated to 150°C and held for 24 hours. After naturally cooling to room temperature, the product was collected by centrifugation, washed three times with distilled water and absolute ethanol, and dried in an oven at 60°C.

[0038] (2) Preparation of zinc selenide-zinc sulfide composite materials:

[0039] The zinc sulfide hollow nanospheres and selenium powder prepared in step (1) were mixed and ground evenly at a mass ratio of 10:1, placed in a tube furnace, heated to 600°C under an argon atmosphere, kept for 6 hours, and then heated in the furnace Cool to room temperature.

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Abstract

The invention relates to a lithium ion battery negative electrode material with a high specific capacity and a preparation method thereof. The material is a zinc sulfide-zinc selenide composite material based on a zinc sulfide hollow nanosphere structure. The preparation method is to first prepare a zinc sulfide hollow nanometer Then add selenium powder to selenize the surface of zinc sulfide hollow nanospheres by grinding and heating. The present invention introduces zinc sulfide as the negative electrode material, and uses a simple selenization reaction to obtain a zinc sulfide-zinc selenide composite material, which has significant structural advantages and can provide more oxidation active sites to obtain a higher specific capacity, and Has good mechanical properties and cycle life. Zinc sulfide and zinc selenide are used as the active material of the negative electrode material, and the synergistic effect of the two can improve the electrochemical performance of lithium-ion batteries.

Description

technical field [0001] The technical solution of the invention relates to a high specific capacity lithium ion battery negative electrode material and a preparation method thereof, in particular to a zinc sulfide-zinc selenide composite lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of material chemistry. Background technique [0002] Although the economy and science and technology have developed rapidly since the 21st century, the main source of energy is still limited fossil fuels such as oil, coal and natural gas. It is well known that gases emitted from fossil fuels and biomass fuels pollute the atmosphere and cause serious environmental problems. Therefore, in the face of increasingly serious energy and environmental problems, the development of renewable clean energy has become an urgent problem to be solved. New energy refers to unconventional energy developed and utilized on the basis of new technologies, inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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