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Hollow nitrogen-doped porous carbon sphere as well as preparation method and application thereof

A nitrogen-doped porous carbon, hollow technology, applied in the preparation/purification of carbon, nanotechnology for materials and surface science, electrical components, etc., can solve the problems of low specific capacity and poor rate performance of lithium-sulfur batteries, etc. Achieve the effect of avoiding dissolution and diffusion, improving capacity, improving conductivity and polarity

Pending Publication Date: 2021-03-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of low specific capacity and poor rate performance of lithium-sulfur battery when the existing lithium-sulfur battery positive electrode material is used to prepare lithium-sulfur battery, and provide a kind of hollow nitrogen-doped porous carbon sphere The preparation method, the prepared hollow nitrogen-doped porous carbon sphere has a hollow porous structure, and has a strong adsorption and fixation effect on polysulfides. As the positive electrode material of the lithium-sulfur battery, the prepared lithium-sulfur battery has a high capacity and a high rate. Excellent performance and cycle stability

Method used

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  • Hollow nitrogen-doped porous carbon sphere as well as preparation method and application thereof
  • Hollow nitrogen-doped porous carbon sphere as well as preparation method and application thereof
  • Hollow nitrogen-doped porous carbon sphere as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0037] A method for preparing hollow nitrogen-doped porous carbon spheres, comprising the steps of:

[0038] S1. Dissolve 0.73g of zinc nitrate hexahydrate and 0.3g of thioacetamide in 50mL of water respectively and mix them, reflux at 120°C for 2h, centrifuge, wash and separate, and freeze-dry to obtain zinc sulfide spherical template (ZnS); wherein nitric acid hexahydrate The mol ratio of zinc and thioacetamide is 1:2;

[0039] S2. Dissolve 0.5g of ZnS and 0.45g of dopamine hydrochloride in a mixed solution of 37.5mL of ethanol and 25mL of water, conduct a hydrothermal reaction at 140°C for 2 hours, separate by centrifugal washing and vacuum drying to obtain polydopamine-coated zinc sulfide (ZnS@PDA); Wherein the mol ratio of zinc sulfide spherical template and dopamine hydrochloride is 2:1;

[0040] S3. ZnS@PDA was calcined at 900 °C for 3 hours under an inert gas atmosphere to obtain hollow nitrogen-doped porous carbon spheres (NHPCS).

Embodiment 2

[0042] The preparation method of the hollow nitrogen-doped porous carbon sphere of the present embodiment is the same as that of Example 1, the difference is that the molar ratio of zinc nitrate and thioacetamide is replaced by 1:1; The molar ratio was replaced with 5:1.

Embodiment 3

[0044] The preparation method of the hollow nitrogen-doped porous carbon spheres in this example is the same as that in Example 1, except that the reaction temperature in step S1 is replaced by 90°C.

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Abstract

The invention discloses a hollow nitrogen-doped porous carbon sphere and a preparation method and an application thereof. The preparation method comprises the steps that zinc sulfide serves as a self-sacrificing template, conducting polymer polydopamine serves as a carbon precursor, a polydopamine zinc sulfide precursor (ZnS-coated PDA) is prepared through a hydrothermal reaction, the hollow nitrogen-doped porous carbon sphere (NHPCS) is prepared after further calcination, the steps of the preparation method are few, the operation is easy, and the prepared hollow nitrogen-doped porous carbon spheres can avoid the dissolution and diffusion of polysulfide, promote the transportation and storage of charges and ions, improve the conductivity and polarity of the carbon material and further improve the polysulfide limiting capacity of the synthesized electrode material when being used as the positive electrode material of the lithium-sulfur battery. The prepared hollow nitrogen-doped porouscarbon spheres are applied to a lithium-sulfur battery after being loaded with sulfur, the capacity of the battery is high, and the battery shows excellent rate capability and cycling stability whichare far higher than those of a traditional carbon nanotube-based positive electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur battery materials, in particular to a hollow nitrogen-doped porous carbon sphere and its preparation method and application. Background technique [0002] Lithium-sulfur batteries have attracted increasing attention. A lithium-sulfur battery is a lithium battery that uses sulfur as the positive electrode material of the battery and metallic lithium as the negative electrode material. Elemental sulfur is abundant in the earth and has the characteristics of low price and environmental friendliness. Lithium-sulfur batteries using sulfur as the positive electrode material have high theoretical specific capacity and battery theoretical specific energy. However, the commercial development of lithium-sulfur batteries still faces many challenges. The main problems are: (1) active sulfur and its discharge The product lithium sulfide is an electronic / ion insulating material, which is not conducive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCC01B32/05H01M4/625H01M4/628H01M4/38H01M10/052B82Y30/00B82Y40/00C01P2004/03Y02E60/10
Inventor 肖迎波张琪郭思嘉黄少铭
Owner GUANGDONG UNIV OF TECH
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