CoS-SnS-NC composite material with heterojunction structure as well as preparation method and application thereof

A composite material and heterojunction technology, applied to structural parts, active material electrodes, electrical components, etc., can solve the problems of long ion transmission path, poor cycle stability, and low specific capacity of sodium storage, shortening the diffusion distance, reducing Agglomeration, the effect of reducing the diffusion path

Active Publication Date: 2022-02-08
多助科技(武汉)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conventional single-component metal sulfides have problems such as poor conductivity, large volume changes during charging and discharging, and long ion transmission paths, which lead to defects such as low specific capacity for storing sodium, poor rate performance, and short cycle life. After 200 cycles, the specific capacity of the ion battery negative electrode composite material will lose 10%, and the cycle stability is poor.

Method used

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  • CoS-SnS-NC composite material with heterojunction structure as well as preparation method and application thereof
  • CoS-SnS-NC composite material with heterojunction structure as well as preparation method and application thereof
  • CoS-SnS-NC composite material with heterojunction structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a CoS-SnS-NC composite material with a heterojunction structure, specifically comprising the steps of:

[0038] S1. Dissolve 2mmol cobalt nitrate, 6mmol urea and 3mmol ammonium fluoride in 60mL deionized water, heat to 120°C in an oven for 12h, centrifuge, wash and dry to obtain the Co precursor;

[0039] S2. Take 50 mg of the Co precursor obtained in step S1 and disperse it in 50 ml of absolute ethanol, then add 200 mg of thioacetamide (TAA) and 175 mg of tin tetrachloride, heat to 140 ° C for solvothermal reaction for 12 h, cool to room temperature, and Centrifuge, wash, and dry at 60°C for 12 hours to obtain Co 3 S 4 @SnS 2 Composite particles;

[0040] S3. Take 100mg Co 3 S 4 @SnS 2 After mixing evenly, ultrasonically disperse in 10mmol tris (Tris) buffer, adjust the pH value to 8.5 by hydrochloric acid, then add 100mg dopamine hydrochloride to stir the reaction, after washing and drying, Co 3 S 4 @SnS 2 - PDA;

[0041] S4. the Co ob...

Embodiment 2

[0044] A method for preparing a CoS-SnS-NC composite material with a heterojunction structure, specifically comprising the steps of:

[0045] S1. Dissolve 2mmol cobalt nitrate, 4mmol urea and 4mmol ammonium fluoride in 60mL deionized water, heat to 120°C in an oven for 12h, centrifuge, wash and dry to obtain the Co precursor;

[0046] S2. Take 25 mg of the Co precursor obtained in step S1 and disperse it in 50 ml of absolute ethanol, then add 300 mg of thioacetamide (TAA) and 175 mg of tin tetrachloride, heat to 160 ° C for solvothermal reaction for 8 h, cool to room temperature, and Centrifuge, wash, and dry at 60°C for 12 hours to obtain Co 3 S 4 @SnS 2 Composite particles;

[0047] S3. Take 100mg Co 3 S 4 @SnS 2 After mixing evenly, ultrasonically disperse in 10mmol tris (Tris) buffer, adjust the pH value to 8.5 by hydrochloric acid, then add 100mg dopamine hydrochloride to stir the reaction, after washing and drying, Co 3 S 4 @SnS 2 - PDA;

[0048] S4. the Co obt...

Embodiment 3

[0051] A method for preparing a CoS-SnS-NC composite material with a heterojunction structure, specifically comprising the steps of:

[0052] S1. Dissolve 2mmol of cobalt nitrate, 8mmol of urea and 8mmol of ammonium fluoride in 60mL of deionized water, heat to 120°C in an oven for 12h, centrifuge, wash and dry to obtain the Co precursor;

[0053] S2. Take 100 mg of the Co precursor obtained in step S1 and disperse it in 50 ml of absolute ethanol, then add 200 mg of thioacetamide (TAA) and 175 mg of tin tetrachloride, heat to 120 ° C for solvothermal reaction for 16 h, cool to room temperature, and Centrifuge, wash, and dry at 60°C for 12 hours to obtain Co 3 S 4 @SnS 2 Composite particles;

[0054] S3. Take 100mg Co 3 S 4 @SnS 2 After mixing evenly, ultrasonically disperse in 10mmol tris (Tris) buffer, adjust the pH value to 8.5 by hydrochloric acid, then add 100mg dopamine hydrochloride to stir the reaction, after washing and drying, Co 3 S 4 @SnS 2 - PDA;

[0055] ...

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Abstract

The invention discloses a CoS-SnS-NC composite material with a heterojunction structure as well as a preparation method and application thereof. The CoS/SnS heterojunction structure is taken as a core of the composite material, and a nitrogen-doped carbon layer is taken as a shell of the composite material; an internal electric field can be introduced by the heterojunction structure, so that the electron conductivity and the ion diffusion kinetics are improved, and the transmission of electrons and ions is further facilitated; and the composite material is of a spherical structure, and the particle size is 0.8-1.2 [mu] m. The composite material has a spherical micro/nano structure, and the micro/nano structure can shorten the diffusion distance of sodium ions and provide more sodium storage active sites. The preparation method comprises the following steps: S1, taking cobalt nitrate, urea and ammonium fluoride as raw materials, and synthesizing a Co precursor through a hydrothermal method; s2, carrying out solvothermal reaction on the Co precursor, thioacetamide and tin tetrachloride to obtain Co3S4@ SnS2; s3, coating the prepared sample with a polydopamine layer, and forming Co3S4 @SnS2-PDA; and S4, carrying out high-temperature reaction under the protection of Ar, so as to obtain CoS-SnS-NC.

Description

technical field [0001] The invention relates to the technical field of electrode materials for sodium ion batteries, and more specifically, relates to a CoS-SnS-NC composite material with a heterojunction structure and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are already the main power behind a variety of portable electronics and electric vehicles. However, the price of metal lithium is relatively expensive, the production cost of lithium-ion batteries is high, and the reserves of lithium in the earth's crust are relatively limited, which makes it unable to meet the growing demand for energy storage devices. Due to the abundance and wide distribution of sodium metal, low cost and similar electrochemical properties to lithium-ion batteries, sodium-ion batteries are considered to be a promising alternative; however, due to the larger radius of sodium ions than lithium ions, sodium Intercalation and extraction in the neg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5815H01M4/625H01M10/054H01M2004/027Y02E60/10
Inventor 刘启明万淑云
Owner 多助科技(武汉)有限公司
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